Physiological Responses to Drought Stress of Five Speciesfrom Catalpa Scop

doi:10.7525/j.issn.1673-5102.2021.01.006

Abstract

Abstract:

In order to analyze the response to drought stress of the five species of Catalpa Scop.， to provide theoretical basis for the selection on drought-resistant breeding and cultivation of drought-resistant tree species of Catalpa Scop.， the C.speciosa， C.fargesii f.duclouxii， C.fargesii， C.ovata， and C.bungei were selected as materials， and cultivated for 50 days under the water conditions of 700 and 400 mL respectively， and seedling height， diameter， leaf water potential， relative content of chlorophyll， chlorophyll fluorescence parameters， and specific leaf weight were measured respectively. The membership function method was used to comprehensively evaluate drought resistance. The results showed that the C.bungei grew best but the C.ovata was relatively poorest under the two water conditions. Under drought stress， except for the C.speciosa， the leaf water potential（Ψ_L） of all other species decreased， and the maximum stomatal conductance（G_s） increased respectively. The relative chlorophyll content（SPAD） of different species increased under drought stress. The maximum light energy conversion efficiency（F_v/F_m） of photosystem Ⅱ of each species increased under drought stress， except for C.fargesii f.duclouxii and C.bungei. In addition to C.fargesii， the specific leaf weight（LMA） of other tree species increased under drought stress. The results of comprehensive drought resistance using the membership function method were gray C.fargesii>C.ovata>C.fargesii f.duclouxii>C.bungei>C.speciosa. The results showed that different species of Catalpa Scop. have different drought resistance. Comprehensive analysis showed that the drought resistance of C.bungei and C.fargesii were strong， and that of C.fargesii f.duclouxii and C.ovata were the second， and that of C.speciosa was the worst.

Key words: Catalpa Scop., drought stress, physiological response, difference

CLC Number:

S792.21

Xiao-Chi YU, Gui-Juan YANG, Ju-Lan DONG, Jun-Hui WANG, Wen-Jun MA, Peng ZHANG. Physiological Responses to Drought Stress of Five Speciesfrom Catalpa Scop[J]. Bulletin of Botanical Research, 2021, 41(1): 44-52.

Figures/Tables 6

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Table 1

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树种 Species	叶片水势Ψ_L（MPa）		气孔导度G_s(mmol·m^-2·s^-1)
树种 Species	700 mL	400 mL	700 mL	400 mL
黄金树C.speciosa	-3.32±0.72a	-2.83±0.21a	269.0±128.4a	447.2±69.2a
梓树C.ovata	-2.72±0.27a	-3.16±0.11ab	362.2±63.6a	199.0±90.3b
灰楸C.fargesii	-2.92±0.52a	-3.39±0.45ab	313.9±171.0a	226.8±144.5b
滇楸C.fargesii f.duclouxii	-2.88±0.62a	-3.85±0.92b	219.9±61.2a	198.8±90.5b
楸树C.bungei	-3.18±0.36a	-5.29±0.23c	300.5±41.9a	204.6±74.3b

时间 Time	黄金树 C.speciosa		梓树 C.ovata		灰楸 C.fargesii		滇楸 C.fargesii f.duclouxii		楸树 C.bungei
时间 Time	700 mL	400 mL	700 mL	400 mL	700 mL	400 mL	700 mL	400 mL	700 mL	400 mL
6:30	85.8	90.2	89.4	50.1	105.2	108.1	169.2	119.7	86.9	73.7
8:30	216.3	242.0	288.4	185.9	254.2	251.1	369.8	253.8	287.5	246.4
10:30	269.0	447.2	362.2	199.0	313.9	226.8	300.5	204.6	219.9	198.8
12:30	173.1	254.4	229.5	92.1	179.9	205.6	189.4	117.7	191.2	25.5
14:30	120.8	115.9	170.1	98.6	136.6	87.2	158.7	65.2	57.0	23.9
16:30	106.8	148.1	195.8	81.4	135.0	91.9	136.2	79.3	54.7	41.6
18:30	206.3	92.0	107.2	72.4	111.5	90.9	163.2	83.3	88.0	47.3

树种 Species	最大光能转化效率F_v/F_m		比叶重LMA（mg·cm^-2）
树种 Species	700 mL	400 mL	700 mL	400 mL
黄金树C.speciosa	0.821±0.002a	0.825±0.014b	0.004 1±0.000 5b	0.004 1±0.000 2b
梓树C.ovata	0.826±0.010a	0.829±0.009b	0.004 4±0.000 4b	0.004 9±0.000 2b
灰楸C.fargesii	0.818±0.009a	0.823±0.010b	0.006 7±0.000 5a	0.006 4±0.001 3a
滇楸C.fargesii f.duclouxii	0.848±0.003a	0.846±0.004b	0.004 0±0.000 4b	0.004 4±0.000 3b
楸树C.bungei	0.801±0.057a	0.797±0.021a	0.004 3±0.001 1b	0.004 6±0.000 4b

树种 Species	隶属函数值Subordinative function					综合评价D值 Evaluation D
树种 Species	叶绿素相对含量 SPAD	气孔导度 G_s	叶片水势 Ψ_L	比叶面积 LMA	最大光能转化效率 F_v/F_m	综合评价D值 Evaluation D
黄金树C.speciosa	2.820	2.899	2.827	2.833	2.835	0.022
梓树C.ovata	3.144	3.299	3.160	3.176	3.180	0.039
灰楸C.fargesii	3.373	3.543	3.387	3.400	3.403	0.040
滇楸C.fargesii f.duclouxii	3.832	4.011	3.847	3.862	3.865	0.037
楸树C.bungei	5.269	5.440	5.290	5.311	5.315	0.025

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[9]	FANG Zi-Wen, ZHANG Xia-Yan, TAO Jun, ZHAO Da-Qiu. Ameliorative Effect of Ferulic Acid on Paeonia ostii under Drought Stress [J]. Bulletin of Botanical Research, 2020, 40(3): 353-359.
[10]	QIAO Bin-Jie, WANG De-Qiu, GAO Hai-Yan, LI Zhao-Min, GE Li-Li, DING Wen-Ya, ZHAO Xi-Yang. Photosynthetic and Stomatal Morphological Variation of Poplar Clones in Seedling Stage under Drought Stress [J]. Bulletin of Botanical Research, 2020, 40(2): 177-188.
[11]	ZHAO Min, HAO Wen-Ying, NING Xin-Zhe, HAO Long-Fei, YAN Hai-Xia, MU Ya-Nan, BAI Shu-Lan. Screening of Excellent Ectomycorrhizal Fungi-tree for Drought Resistant with Pinus sylvestris var. mongolica [J]. Bulletin of Botanical Research, 2020, 40(1): 133-140.
[12]	ZHANG Ling, ZHANG Dong-Lai. Difference in Morphology and Physiology from Male and Female Plant of Phellodendron amurense Rupr. [J]. Bulletin of Botanical Research, 2019, 39(6): 876-882.
[13]	JI Li, HAN Jiao, WANG Fang, WANG Jun, SONG Di, ZHANG Li-Jie, QI Yong-Hui, YANG Yu-Chun. Effects of Drought Stress on Photosynthetic and Physiological Characteristics of Juglans mandshurica Seedlings in Different Soil Substrates [J]. Bulletin of Botanical Research, 2019, 39(5): 722-732.
[14]	JIN Jiao-Jiao, SONG Zi-Wen, MA Xiao-Yu, SUN Guo-Yu, LI Kai-Long. Morphological and Physiological Responses of Populus ussuriensis Kom. to Drought Stress [J]. Bulletin of Botanical Research, 2019, 39(4): 490-496.
[15]	ZHAO Min, WANG Yue-Xuan, XU Yun-Fei, ZHAO Qi-An, LIU Bo, YANG Ning. Relationship between H₂S and ABA Signaling in Arabidopsis thaliana under Drought Stress [J]. Bulletin of Botanical Research, 2019, 39(1): 104-112.