Table of Content

20 January 2024, Volume 44 Issue 1

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Taxonomy

Eight Newly Recorded Species of Spermatophyte from Gexigou National Nature Reserve,Sichuan Province

Xuyan CHEN, Xingyu LIU, Mei HUANG, Ting DENG, Xiaolu GONG, Zhimin JIANG, Gang GAO

2024, 44(1):  12-16.  doi:10.7525/j.issn.1673-5102.2024.01.003

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Based on field investigation and specimen identification in Gexigou National Nature Reserve， six families， seven genera， six species， one subspecies and one variety were identified as new records in Sichuan Province， viz. Populus wuana C. Wang et Tung（Salicaceae）， Lonicera spinosa Jacq. ex Walp.（Caprifoliaceae）， Rhododendron przewalskii Maxim.subsp. yushuense Fang et S.X.Wang（Ericaceae）， Ligularia confertiflora Chang（Asteraceae）， Rhodiola serrata H. Ohba（Crassulaceae）， Meconopsis racemosa var. spinulifera（L.H.Zhou） C.Y.Wu et H.Chuang（Papaveraceae）， Taraxacum luridum Hagl.（Asteraceae）， Taraxacum pseudoatratum Oraz.（Asteraceae）， voucher specimens（GAO20230301-08） were preserved in the herbarium of Yibin University.

Plant reproductive biology

Flowering Biological Characteristics and Breeding System of Lumnitzera racemosa

Yanqing CAI, Yujun CHEN, Mei LI, Chuangfa DENG, Liejian HUANG

2024, 44(1):  152-160.  doi:10.7525/j.issn.1673-5102.2024.01.017

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In order to reveal the endangered mechanism and carry out related conservation actions of Lumnitzera racemosa， we observed the flowering dynamics of the introduced L. racemosa in Dangan Island Provincial Nature Reserve， Zhuhai， Guangdong， and investigated the breeding system of L. racemosa by using the out-crossing index（OCI）， pollen-ovule ratio（P/O）， pollen viability and stigma receptivity， and artificial pollination. The results showed that： （1）The flowering period of L. racemosa population started May 16， the full blooming period was from May 25 to July 1， and the last flowering period was from July 5 to August 31， and the flowering period of L. racemosa population was up to 106 days. The flowering duration of inflorescence was 5-18 days， and average duration was （10.80±3.58） days； The single flowering period of L. racemose lasted 7-13 days， with an average of （9.1±1.3） days. （2）Pollen viability was highest on the day of flowering， reaching 58.73%， and decreased on the second day and no longer viable was on the third day； Stigma receptivity was weakest at the first day of opening， then gradually strengthened， and was strongest at 100% at the third day， and maturity time of male and female was inconsistent. （3）OCI was 4， the breeding system of L. racemosa was mainly outcrossing with partial self-compatible， which required pollinator； P/O was 5 740.50±1 318.20， the breeding system was obligate xenogamy； pollination test showed that the breeding system was a mixed mating system with both self and xenogamy. Based on the above， the breeding system of L. racemosa was mainly outcrossing with partial self-compatibility and requiredr pollinators.