Table of Content

20 January 2008, Volume 28 Issue 1

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Goodyera pendula Maxim. A New Record of Orchidaceae from Mailand China

TIAN Huai-Zhen;CHUNG Shih-Wen;ZHENG Xi-Long;XING Fu-Wu*

2008, 28(1):  1-2.  doi:10.7525/j.issn.1673-5102.2008.01.001

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Goodyera pendula Maxim, previously only reported from Japan and Taiwan, is reported for the first time in mainland China. This species is characterized by growing mainly on the trank, inflorescence pendulous and then ascending like L-shape, with dense glandular hairs, densly flowered, all flowers one side, not fully opened. Specimens are preserved in Herbarium of South China Institute of Botany, the Chinese Academy of Sciences (IBSC).

Classification and Distribution of Cyrtogonellum from Limestone in Guangdong

WANG Fa-Guo;YE Yu-Shi;LIU Dong-Ming;XING Fu-Wu*

2008, 28(1):  3-4.  doi:10.7525/j.issn.1673-5102.2008.01.002

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Cyrtogonellum is a endemic fern genus that restricted to the limestone areas of SW China and N Vietnam. Four species are recohgnised from Guangdong Province and three of them are new records to this province, i.e.: Cyrtogonellum emeiensis Ching ex Y. T. Hsih, C. falcilobum Ching ex Y. T. Hsieh and C. fraxinellum (Christ) Ching. It is suggested that these species should be listed as national protected plants in China.

A Correction of the Scientific Name of Dryopteris bissetiana (Baker) C. Chr. vs Dryopteris setosa (Thunb.) Akasawa in Chinese Fern Flora

ZHANG Xian-Chun

2008, 28(1):  5-6.  doi:10.7525/j.issn.1673-5102.2008.01.003

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Dryopteris bissetiana (Baker) C. Chr. is a rather common and well known fern in China. Unfortunately in the Chinese national flora (Flora Reipublicae Popularis Sinicae), it is recorded by an illegitimate name, i.e. Dryopteris setosa (Thunb.) Akasawa. The application of the correct scientific name of this plant is resumed.

Alleviative Effects of Exogenous Nitric Oxide on Root Growth Inhibition and Its Oxidative Damage in Rye Grass Seedlings Under NaCl Stress

LIU Jian-Xin;HU Hao-Bin;WANG Xin

2008, 28(1):  7-13.  doi:10.7525/j.issn.1673-5102.2008.01.004

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Effects of exogenous nitric oxide (NO) on root growth and its oxidative damage in rye grass (Lolium perenne L. caddieshack) seedlings under NaCl stress were studied. The results showed that with its concentration at 5~100 μmol·L^-1 sodium nitroprusside(SNP), an NO donor, could significantly alleviate the inhibitory effect of seedlings root Growth under 100 mmol·L^-1 NaCl stress, and 50 μmol·L^-1 SNP was most effective, but inhibited the root growth at 150 μmol·L^-1 or higher. SNP at 50 μmol·L^-1 raised the activities of superoxide dismutase (SOD), catelase (CAT), peroxidase (POD) and ascorbate peroxidase (APX), tonoplast H⁺-ATPase and H⁺-PPase of root- tips of rye grass seedling under 100 mmol·L^-1 NaCl stress, increased the contents of glutathione (GSH), ascorbic acid (ASA) and proline, K⁺/Na⁺ and (Spd+Spm)/Put ratio, and dry matter accumulation, respectively, reduced the contents of O^-₂, H₂O₂ and malondiadehyde (MDA), while the effect wasn’t distinct when treated with 1 mmol·L^-1 NO scavenger(2-phenel-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, PTIO) and 1 mmol·L^-1 NaNO₂ (as control). The above results suggested that NO could attenuate the root growth inhibition and its oxidative damage caused by salt stress through increasing antixoidative and osmotic adjustment capabilities, accelerating the selective uptake of root to K⁺ and the transformation Put into Spd and Spm, and decreasing Na⁺ uptake and enhancing compartmentalization of Na⁺ in vacuole.

Studies on the development of embryo and endosperm and its influence on the germination of seeds of Bupleurum chinense

CHEN Ying;CAI Xia*;HU Zheng-Hai;Tan Ling-Ling

2008, 28(1):  14-19.  doi:10.7525/j.issn.1673-5102.2008.01.005

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The development of embryo and endosperm and its influence on the germination of seeds of Bupleurum chinense were studied by means of paraffin section. The development of embryo belongs to the solanad type. The basal cell dose not divide again after the first transverse division, so the suspensor is not well developed and dissolved early. The development of the endosperm is of nuclear type. The division of primary endosperm nucleus is prior to that of zygote. According to the statistics of the embryo development stage after seeds were collected, it is found that in all the seeds observed, embryo of 20% of the seeds belong to globular proembryo stage, 70% is heart-shaped embryo, 10% is torpedo embryo stage. The results showed that the developmental stage of the embryo in the collected seeds of Bupleurum chinense is different and the seeds have morphological post-maturation. This is the main reason why the seeds of Bupleurum chinense are difficult to germinate and the ratio of germination is very low.

Studies on the leaf epidermal micromorphology of Sisymbrium (Brassicaceae) from China

SUN Zhi-Ying;LI Fa-Zeng*

2008, 28(1):  20-24.  doi:10.7525/j.issn.1673-5102.2008.01.006

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Leaf epidermis of 9 species and 1 variety of Sisymbium was investigated using light microscopy(LM). The main conclusions are as follows: The cells of the upper epidermis are usually polygonal, and the patterns of anticlinal walls are straight or arched, few slightly sinuolate. The cells of the lower epidermis are usually irregular and the patterns of anticlinal walls are sinuous or sinuate. The type of stomatal apparatuses is mainly anisocytic, rarely anomocytic and only occasionally paracytic. According to the leaf epidermal characters, the genus Sisymbrium from China can be divided into three types: (1) The upper epidermis has no or very few stomatal apparatuses. (2)The stomatal apparatuses of upper epidermis are usually gathered with 3 or 5 or arranged in short rows，and the stomatal density is less than that of the lower epidermis. (3) The stomatal apparatuses of upper epidermis are regularly dispersed, and the stomatal density is similar to that of lower epidermis.Leaf epidermis of 9 species and 1 variety of Sisymbium was investigated using light microscopy(LM). The main conclusions are as follows: The cells of the upper epidermis are usually polygonal, and the patterns of anticlinal walls are straight or arched, few slightly sinuolate. The cells of the lower epidermis are usually irregular and the patterns of anticlinal walls are sinuous or sinuate. The type of stomatal apparatuses is mainly anisocytic, rarely anomocytic and only occasionally paracytic. According to the leaf epidermal characters, the genus Sisymbrium from China can be divided into three types: (1) The upper epidermis has no or very few stomatal apparatuses. (2)The stomatal apparatuses of upper epidermis are usually gathered with 3 or 5 or arranged in short rows，and the stomatal density is less than that of the lower epidermis. (3) The stomatal apparatuses of upper epidermis are regularly dispersed, and the stomatal density is similar to that of lower epidermis.

Anatomy Studies of Four Mosses in Glacier No.1 of Xinjiang

WANG Hong;JIANG Yan-Cheng*;SU Jun

2008, 28(1):  25-29.  doi:10.7525/j.issn.1673-5102.2008.01.007

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Applied paraffin wax section and scanning electron microscopy to observing and analysing the inner structure of stems and leaf, the cuticular wrinkles, papillae and midrib of the leaf. The results indicate that transverse section of stem is mutirhomboidal, the cuticulas of cuticle and ventral are thicker in Barbula asperifolia Mitt., the scabrous papillae is unforked, while top parts tilt to cell cave, cell wall of cuticle like splay stoma, scabrous papillae locate in it and Midrib distinct process. Transverse section of stem of Tortella humilis (Hedw.) Jenn. is ellipse, cuticle and mid-top venter are covered densely by scabrous papillae which are forked and protrude from cell cave and form a cluster, bent like a hook at the top, papillae reduce little by little under the leaf, with midrib broadish. Transverse section of stem of Mnium heterophyllum (Hook.) Schwagr. is pentagon, leaf cell are single and present unregular hexagon, whereas cell wall dent and become reticulation and midrib is red. Transverse section of stem of Hypnum plumaeforme Wils. is round, the cuticle and venter of are covered densely by rugged papilla that there is no appreciable distinction between them, top part of all scabrous papillae bend and tilt to stoma, present shade. midrib is short and ebb.

Anatomical Structures of Leaves and Taxonomic Values in Iris from the North of China

WANG Hong;SHEN Xiao-Hui*;GUO Ying

2008, 28(1):  30-37.  doi:10.7525/j.issn.1673-5102.2008.01.008

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Structural characters of leaf epidermis from 9 species in Iris from the North of China, such as the epidermal cells, the distribution of stomata, density of stomata and the stomata index, were investigated using light microcopy (LM), which aimed to study their taxonomic values between subgenus and subsection. The shape and size of the epidermal cells has taxonomic value that manifests the genetic relationship between different species,and has much systematic significance in distinguishing within difffenent section and subgenus in Iris L. Density and index of stomata has no systematicsignificance in distinguishing within subgenus in Iris L., but it can reflect their living environment. And from the results of epidermal structure,it confirmed a strong
genetic relationship between I. dichotoma and Belamcanda chinensi,consistent with other anmatomy of leaves such as:vascular,the cross shape of leaf,stomata,crystal,mesophyll protoplast,size of gas chamber which reflect the connection between microstructure and living environment were also discussed.


Micromorphological Features of Achene Surfaces of 16 Species Of Subgen Saussurea in the Eastern of the Qinghai-Tibet Plateau

WANG Yi-Feng;*;WANG Jian-Hong;SHI Hai-Yan;GAO Hong-Yan

2008, 28(1):  38-42.  doi:10.7525/j.issn.1673-5102.2008.01.009

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Micromorphological characteristics of achene surfaces were studied in 16 species belonging to 4 sections of Subgen Saussurea in Lipsh by the scanning electron microscope. These species were obtained from the eastern of the Qinghai-Tibetan plateau fringe We got the results as follow, (1) According to micromorphological characteristics, the achene surface features can be divided into three types, striate ornamentation, septate striate ornamentation, and reticulate ornamentation. (2) The achene surface features were constant in infraspecific. At the same time, achene surface features of interspecies were similar in same section and distinctive in different ones. Therefore, it seemed to be useful to use micromorphological characteristics in Subgne Saussurea taxonomy both at species and sectional level.

Effects of Cd,Pb and Their Combined Pollution on Physiological Indexes in Leaf of the Hordeum vulgare Seedling

ZHANG Yi-Xian;LI Xiao-Ke

2008, 28(1):  43-46.  doi:10.7525/j.issn.1673-5102.2008.01.010

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Effects of Cd,Pb and their combined pollution on physiological indexes in leaf of the Hordeum vulgare seedling were studied by the indoor cultivation experiments. The results showed that with the increase of Cd,Pb and Cd+Pb concentrations, content of soluble sugar increased first and decreased afterwards. In Cd,Pb single treatment condition, different concentrations Cd,Pb can make cellular membrane penetration(CMP) in leaf increase, relative conductance of leaf exosmosis liquids and content of proline ascended. Damnification of Cd+Pb combined treatment on CMP was higher than those of Cd,Pb single treatment, effect of low concentrations(5+50 mg·L^-1) combined treatment on content of soluble sugar was higher than those of Cd,Pb single treatment. In different treatment time(3,5 d), Effects of all Cd+Pb combined treatment on content of proline in leaf were higher than those of Cd,Pb single treatment, toxicity of Cd in H. vulgare seedling was higher than that of Pb. However, toxicity of Cd+Pb combined treatment in H. vulgare seedling was higher than that of Cd,Pb single treatment, interaction mechanism of Cd,Pb was deserved further study.

Reponses of Photosynthetic Capacities，Antioxidant Activities and Monoterpene Biosynthesis in Leaves of Hevea brasiliensis Tree to Jasmonic Acid

CHEN Jun-Wen;CAO Kun-Fang

2008, 28(1):  47-53.  doi:10.7525/j.issn.1673-5102.2008.01.011

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Jasmonic acid (JA) were sprayed on the leaves of Hevea brasiliensis, and the photosynthetic capacities, photosynthetic pigments, and antioxidant metabolites as well as activities of antioxidant enzymes after treated by JA for 1, 24, 48, 72, 96, 120 h were measured. The results revealed that JA led to the decline in maximum net photosynthetic rate, stomata conductance, and photochemical efficiency of photosystem II. The decline in photosynthetic capacity might be resulted from the JA-induced decreases in the contents of chlorophyll, carotenoids, and total soluble protein. Whereas, the levels of hydrogen peroxide (H₂O₂) were increased after JA treatment. Meanwhile, the increases in H₂O₂ levels could activate the antioxidant system. Therefore, the activities of superoxide dismutase, catalase, and guaiacol peroxidase were increased, and the cycles of ascrobate-glutathione were enhanced after the JA-induced increase in H₂O₂ levels. However, the potential antioxidants of α-pinene, β-pinene, sabinene, and total monoterpene were initially increased, and then decreased.

Influence of Leaf Traits in Induced Gladiolus “Rose Supreme”by Electron Beam Irradiation

ZHANG Zhi-Wei;WANG Dan;Zheng Chun;Qiao Guang-Ming;Jia Ju-Qing;Zhao Jun-Ling

2008, 28(1):  54-58.  doi:10.7525/j.issn.1673-5102.2008.01.012

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In order to test the feasibility of electron beam induced mutation on Gladiolus and the effects of various doses of electron beam on leaf traits. Electron beam was radiated on the corm of gladiolus “chaoji” with 3MeV energy and the effects of the treatment on M1 generation leaf traits were studied. The effect of electron beam on photosynthetic characteristics were investigated in experiments, and the results obtained from this experiment were as follows: low dose of electron beam had no obvious effects on the photosynthetic rate，transpiration rate，Sub-stomatal cavity CO₂ concentration and stomatal conductivity of CO₂ of M1 generation. With the increase of radiation dose, the transpiration rate and stomatal conductivity of CO₂ was obviously catalyzed and the difference had statistical significance (p<0.05). The effect of electron beam Irradiation on the Chlorophyll content in gladiolus was studied and the result showed chlorophyll content and the ratio of the Chlorophyll a/b of the gladiolus treated were changed. The chlorophyll a content was the highest at 240Gy than others and the difference had statistical significance (p<0.05). Comparing scanning electron microscope (SEM) photograph of the leaf shapes of M1 generation with control and it showed that the structure both trichome and stomata was changed and the surface organize characteristic of leaf is obviously disorderly arranged. These results show that electron beam induction had influence on morphology and physiology of gladiolus leaf.

The Genetic and Morphological Evidence for Sympatric Speciation Pattern of Paris from Emei Mountain

ZHANG Rui;WANG Li;TANG Ming-Xia;WENG Zhou

2008, 28(1):  59-63.  doi:10.7525/j.issn.1673-5102.2008.01.013

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Amplified Fragment Length Polymorphism (AFLP) was used to analyze the differentiation of 2 natural species （Paris polyphylla Smith var. minora S.F.Wang & P. thibetica Franch）of Paris of EMEI Mountain. AFLP analysis indicated that there were relatively high genetic comparability among the two species and high genetic differentiation of the P. thibetica Franch and P. polyphylla var. minora with in a geographical region. The flower of morphological diversity was detected among the two species of Paris in EMEI Mountain by morphological analysis.The results suggested that high genetic differentiation and morphological differentiation of the P. thibetica and P. polyphylla Smith var. minora in a geographical region.

Relationship Analysis of Three species of Porphyridium by RAPD

LI Zhan;PANG Wan-Ting;WANG Quan-Xi*

2008, 28(1):  64-66.  doi:10.7525/j.issn.1673-5102.2008.01.014

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The phylogenetic relationships of three species of Porphyridium, Porphyridium aerugineum 755, Porphyridium purpureum 806 and Porphyridium cruentum were analyzed by RAPD. Twenty-five random primers of high reproducible and stable quality were screened from 50 primers. There were 186 polymorphic fragments of 233 total fragments. The cluster analysis results were indicated as follows: The average genetic distance among P. aerugineum, P. purpureum and P. cruentum was 0.455. The genetic distance between P. aerugineum and P. cruentum was 0.556. The genetic distance between P. purpureum and P. cruentum was 0.396. The results show that RAPD technology can be used for genetic diversity researches in species of Porphyridium.

Cloning and Characterization of Beclin1-ike Gene in Eupatorium odoratum L. buds

QI Chang-Qing;LIU Ying;WANG Li;LI Si-Bin;WANG Min;JANG Yang;ZU Yuan-Gang*

2008, 28(1):  67-72.  doi:10.7525/j.issn.1673-5102.2008.01.015

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Beclin1-like gene was cloned from three different growth periods flower buds of Eupatorium odoratum by RT-PCR method in this study. The homology between Beclin1-like gene (about 700bp) and Beclin1 gene in tobacco leaves is 95%; Northern blotting result showed that the expression of Beclin1-like gene in the middle stage was higher than those in initial stages and dernier stage; the result of DNA ladder showed Programmed Cell Death (PCD) happened in the process of flower buds. All the results proved that PCD certainly happened with the tapetum degenerating and the pollen coming into being, which indicated the relationship between the aggressive process of E. odoratum and PCD in the process of the reproduction.

Comparison of Seed Germination and Resistance in Two Limonium Seedlings under NaCl Treatment

YANG Ying-Li;ZHANG Chao-Qiang;LI Ke-Wen;WANG Lai;FAN Xiao-Feng;SUN Kun

2008, 28(1):  73-78.  doi:10.7525/j.issn.1673-5102.2008.01.016

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The changes of physiological indexes were investigated in two halophytes, Limonium aureum (Linn.)Hill (Huanghua) and L. gmelinii (Willd.)Kuntze (Daye) treated with different NaCl concentration. The results showed that the germination of two L. sinuatum seeds was inhibited by NaCl in concentration-dependent manner. Compared to the control, there was decrease of chlorophyll a, chlorophyll b and total chlorophyll content in Huanghua and Daye seedling leaves after 50、150、300 mmol·L^-1 NaCl treatment, and increase in the amount of H₂O₂ and MDA. Soluble protein content was enhanced in two L. sinuatum leaves when exposed to lower NaCl concentration, but decreased to higher NaCl concentration. In addition, the inhibition of the seed germination and chlorophyll content induced by NaCl in Daye was stronger than in Huanghua, suggesting that the salt tolerance of Huanghua was higher than that of Daye.

Preliminary Study of Anther Culture of Platycodon grandiflorum

WU Jing-Ji;WU Ji-Ri*;WU Song-Quan;YAN Yi-Zi;WANG Li-Ping

2008, 28(1):  79-81.  doi:10.7525/j.issn.1673-5102.2008.01.017

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Pollen of Platycodon grandiflorum growing to monokaryotic stage was inoculated in six different culture medium and induced callus, the induced callus was transfered in differentiation culture, trying to get haploidy. The results showed that the culture medium of the highest induced rate of callus was N₆ + 2,4-D 0.2 mg·L^-1 + 6-BA1.0 mg·L^-1 and induced rate was 89.6%, the highest differentiation rate was 58.4% in the culture of N₆ + 6-BA1.0 mg·L^-1 + NAA0.5 mg·L^-1, puny green plant in differentiation was haploidy with the result of chromosome number of root.

An Improving Method for Observation of the Stomata on Monocotyledon

FENG Tao;HU Dong

2008, 28(1):  82-84.  doi:10.7525/j.issn.1673-5102.2008.01.018

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We have built an efficient method to observe the stomata of monocotyledon by improving the traditional one. In this way, it is easy to distinguish the upper from the lower side of plant epidermis and pike a proper point precisely. Moreover, the new method is convenient with good credibility and stability. The stomatal parameter was gained exactly in this way in our experiment, which provides a certain reference for research of the botany and ecology.

Effects of Population Dentisy on Morphological Characteristics of Epimedium sagittatum in Different Growth Periods

QUAN Qiu-Mei;LI Yun-Xiang*

2008, 28(1):  85-89.  doi:10.7525/j.issn.1673-5102.2008.01.019

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To reveal the resource and reproduction patterns of Epimedium sagittatum, the effects of clone fragment density on clonal morphological characteristics were investigated during three periods of sexual reproduction with regression and nonparametric test. The results indicated that significant effects of clonal fragment density on clonal morphological parameters. Based on the results of regression, the intensity of density dependence effect was enhanced, and more resources were allocated to sexual reproduction with the density of clone fragments increased. The results of nonparametric test revealed that the leaf number and leaf breadth of clone were gradually increased to gain more resource to enhance the reproduction capacity.

Geographic Variations of Stipa grandis Clonal Populations in the Xilingol Plateau of Inner Mongolia

ZHAO Nian-Xi;GAO Yu-Bao;WANG Jin-Long;LIU Jing-Ling;LI Chang-Lin

2008, 28(1):  90-97.  doi:10.7525/j.issn.1673-5102.2008.01.020

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The quantitative characters of Stipa grandis clonal populations found in three habitats with different climatic conditions in the Xilingol plateau of Inner Mongolia, were studied by means of one way ANOVA, analysis of variance components and fractal geometry. (1) The three populations had different growth patterns in plant height of vegetative modules in the growing season; plant height of vegetative modules or reproductive modules varied significantly among S. grandis populations and most variation existed among populations. (2) There were significant fractal relationships between aboveground dry matter weight and height of vegetative modules of S. grandis populations in different growth periods of the plant; the fractal dimension value was consistent with the biomass accumulation of vegetative modules when the habitats were not intensively disturbed; while a very rapid increase happened under long-term severe drought conditions. (3) There were also significant fractal relationships between aboveground dry matter weight and plant height of vegetative modules of S. grandis populations in the growing season, furthermore, the values of fractal dimension varied significantly among different populations. All the divergences among different habitats were supposed to be attributed to long-term local adaptation and natural selection.

Study on Interspecific Associations of Natural Nitraria tangtorum Population and Its Main Companion Species in Ulanbuh Desert

LI Zhi-San;LI Feng-Ri

2008, 28(1):  98-103.  doi:10.7525/j.issn.1673-5102.2008.01.021

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A series of techniques including the variance analysis (VR), χ²-test, the association co-efficient（AC）, the percentage of co-ocurrenc (PC) consulting the association indices（OI、DJ、JI）were used together with a 2×2 contingency table to analyze the interspecific associations of natural Nitraria tangtorum population and its main companion species in Ulanbuh Desert Inner Mongolia. Result: In the natural Nitraria tangtorum population，the association of 8 dominant species showed no correlation. By the calculation results, in the all 28 species-pairs, there are 15 species-pairs which revealed positive association, and 13 species-pairs revealed negative association. Most of the species-pairs revealed little significant association except Nitraria tangtorum–Artemisia ordosica. Nitraria tangtorum–Artemisia ordosica revealed significant negative association.. Nitraria tangtorum-herbage and other herbaceous species-pairs distributions trend to be independent. The result is very important to construct steady desert plant community, reconstruct desert plant community and regulate ecological pattern in theory.

Litterfalls of 6 Major Forest Stands at Maoershan Mountain of Heilongjiang Province

ZHANG Dong-Lai;MAO Zi-Jun*;ZHU Sheng-Ying;ZHOU Biao

2008, 28(1):  104-108.  doi:10.7525/j.issn.1673-5102.2008.01.022

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The annual litterfall production, composition and decomposition of the litterfall of six typical stands in Maoershan, Heilongjiang Province were studied in this paper. The results are as follows: (1)the annual litter production is in the sequence of Pinus koraiensis (5.62 t·hm^-2), Fraxinus mandshurica(5.57 t·hm^-2), Pinus sylvestris(5.56 t·hm^-2), Quercus mongolica(4.31 t·hm^-2), Populus davidiana(4.27 t·hm^-2),Larix gmelinii(4.08 t·hm^-2); (2) the fall of leaves of six forests occupies a higher percentage in the annual total litterfall than that of other components; (3)decomposition rates of leaf litter in the six forests obvious: Fraxinus mandshurica > Pinus sylvestris > Larix gmelinii > Populus davidiana > Quercus mongolica > Pinus koraiensis.The simulated time spans needed for 95% weight loss of litter in Fraxinus mandshurica, Quercus mongolica, Populus davidiana, Larix gmelinii, Pinus koraiensis, Pinus sylvestris stand were 3.5, 8.0, 6.7, 6.6, 8.8 and 4.4 years, respectively.

Study on Community Characteristics of Sabina vulgaris Community under Different Stages of Succession

HONE Yu*;WANG Lin-He

2008, 28(1):  109-113.  doi:10.7525/j.issn.1673-5102.2008.01.023

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The autogenic succession process of vegetation in Mu Us Sandland is from Psammochlou uillosa + Agriophyllum arenarium (Artemisia sphaerocephala) on semi-drift-sand dunes to Artemisia ordosica + Sabina vulgaris on semi-fixed-sand dunes, then through S. vulgaris + Poa sphondylodes on fixed-sand dunes and S. vulgaris on fixed dunes of subclimax stage to S. vulgaris + moss community on old-fixed-sand dunes, which maybe pass to a Stipa bungeana steppe finally. The S. vulgaris community succession contains progressive and regressive succession. Species diversity increased with the development of the progressive succession, and the ecological environment began getting wet. Along with the declining of S. vulgaris, some plants exited, species diversity decreased and the habitat of community began getting dry.

Present Situation of the Plant Community Succession on Alluvial Islands at the Mouth of Yangtze River

SONG Guo-Yuan;CAO Tong;XU Cheng-Chong

2008, 28(1):  114-123.  doi:10.7525/j.issn.1673-5102.2008.01.024

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Through the development of alluvial islands at the mouth of Yangtze River(Chongming, Hengsha, Changxing and Jiuduansha) up till now, living and nonliving environmental factors are playing important roles. Among them the age and the height of the islands, soil types, nutrient, salinity, pH, etc. make influence on the formation, colonization and succession of the plant communities. On the basis of field working for several years, applying arithmetic series ordering according to time, the essay expounded the diversity of plant communities, recorded and predicted the plant amount of the past years on alluvial islands. It analyzed the succession status quo of plant communities under various habitats and the environmental factors accustomized by using Canonical correspondence Analysis (CCA), it also made biomass and habitat analysis on the competitions among isolated communities according to the investigation data of plant quadrats. All of these investigation results give basic information to understand the ecosystem on alluvial islands at the mouth of Yangtze River.

Effects of Three Fungi of Helminthosporium on the Contents and Productions of Resveratrol and Polydatin in the Seedling of Rumex gmelini

WANG Zhen-Yue;LI Rui-Ming;WANG Zong-Quan;

2008, 28(1):  124-128.  doi:10.7525/j.issn.1673-5102.2008.01.025

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The effects of fungi of Helminthosporium on the contents and productions of resveratrol and polydatin in the seedling of Rumex gmelini were studied. The results showed that the specialization of polydatin to fungi in the seedling of R. gmelinii was not obvious and there are some relativity between the effect and the concentration of spore suspension. Resveratrol showed some selectivity to fungi. Different strains of Helminthosporium turcicum Passerini had different induction effects and mainly acted on the starting time. Little inhibition effect of various treatments on biomass of the seedling R. gmelinii was observed during the 0-50 d. H. turcicum Passerini 001 could induce the production of polydatin and resveratrol in the seedling R. gmelinii, which increase 1.54 and 3.99 folds, respectively, to the contro1 ones at the strongest induction conditions.