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[1]何家莉 周天阳 宋怡珂 查琳 石凝 商宏莉** 吴彦 NIYATI Naudiyal 杜文涛 王金牛**.青藏高原东南缘不同坡向对陇蜀杜鹃花性状的影响[J].应用与环境生物学报,2021,27(03):1-12.[doi:10.19675/j.cnki.1006-687x.2020.05002]
 HE Jiali,ZHOU Tianyang,SONG Yike,et al.Effects of aspects on floral traits of Rhododendron przewalskii in the Southeastern Tibetan Plateau[J].Chinese Journal of Applied & Environmental Biology,2021,27(03):1-12.[doi:10.19675/j.cnki.1006-687x.2020.05002]
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青藏高原东南缘不同坡向对陇蜀杜鹃花性状的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
27卷
期数:
2021年03期
页码:
1-12
栏目:
研究论文
出版日期:
2021-06-25

文章信息/Info

Title:
Effects of aspects on floral traits of Rhododendron przewalskii in the Southeastern Tibetan Plateau
作者:
何家莉12 周天阳3 宋怡珂24 查琳25 石凝2 商宏莉1** 吴彦2 NIYATI Naudiyal 2 杜文涛6 王金牛26**
1 四川师范大学生命科学学院 成都 610101
2 中国科学院成都生物研究所 成都 610041
3 中国科学院武汉植物园 武汉 430074
4 甘肃农业大学资源与环境学院 兰州 730070
5 四川农业大学林学院 成都 611130
6 中国科学院西北生态环境与资源研究院冰冻圈国家重点实验室 兰州 730000
Author(s):
HE Jiali12 ZHOU Tianyang 3 SONG Yike24 ZHA Lin25 SHI Ning2 SHANG Hongli 1** WU Yan2 NIYATI Naudiyal2 DU W entao6 & WANG Jinniu26**
1 College of Life Science, Sichuan Normal University, Chengdu 610101, China
2 Chengdu Institute of Biology, Chinese Academy of Science , Chengdu 610041, China
3 Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
4 College of Resources and Environmental Sciences, Gansu Agricultural University , Lanzhou 730070, China
5 College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
6 State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy Sciences , Lanzhou 730000, China
关键词:
花管雌蕊柱头坡向异质性异速生长权衡关系适应性策略
Keywords:
corolla tube pistil stigma aspect heterogeneity allometric growth trade-off adaptive strategy
DOI:
10.19675/j.cnki.1006-687x.2020.05002
摘要:
植物的花表型多样性是长期自然选择的结果,是植物对异质性环境的适应性响应。以青藏高原东缘的高山灌丛陇蜀杜鹃(Rhododendron przewalskii)为研究对象,分析花性状在不同坡向的变化特征及其相关关系,力求理解高寒异质生境下的植物适合度,加深对传粉生物学中生殖器官可塑性认识。结果显示:1)东坡的土壤温度及pH值均显著大于东北坡(P = 0.02 , P = 0.001),其土壤容重显著小于东北坡(P < 0.001 ),而其他土壤养分特征在坡向间无显著性差异。2)陇蜀杜鹃的花大小在不同坡向具有显著性差异,即东坡(花管直径:22.74 ± 0.15 mm;花管长度:19.86 ± 0.56 mm)>东北坡(21.00 ± 0.12 mm;18.31±0.34 mm);雌蕊长度在东坡显著大于其东北坡,但出管距离(柱头探出花管的距离)结果则相反;此外,柱头大小及形状在坡向间并无显著差异。花性状在个体间和坡向间变异均较大,其中柱头大小和出管距离变异系数在东坡和东北坡分别为最大,分别为29.13%、28.03%。3)花管直径与花管长度、雌蕊长与花梗长、花柱长与雌蕊长和花梗长、子房与雌蕊长在两个坡向均为极显著正相关(东坡:P < 0.001,P < 0.001,P < 0.01,P < 0.001,P < 0.001;东北坡:P < 0.001,P < 0.001,P < 0.01,P < 0.001,P < 0.001);柱头大小与花柱长、雌蕊长、花梗长在东坡为极显著正相关(P < 0.01,P < 0.001,P < 0.01);柱头大小与子房长在东北坡显著正相关(P = 0.01),与柱头形状显著负相关(P = 0.02)。4)花管直径与花管长度在东坡为异速生长关系,东北坡为等速生长关系;两个坡向上出管距离增加的速率均大于花管长度增加速率。传粉生物学功能性状间的权衡分析表明,东坡偏好增加花管直径,而东北坡偏好增加出管距离以增加繁殖成效。可见,不同坡向的陇蜀杜鹃种内花部性状的高变异性,有利于其在高寒生境中展示出较高的繁衍机会,性状权衡对坡向差异偏好响应有利于陇蜀杜鹃适应高山异质环境。(图5 表3 参56)
Abstract:
The diverse phenotypes of floral traits are evolutionary outcomes of natural selection and their adaptive response to heterogeneous environments. This study aims to understand the plant fitness at alpine heterogeneous habitat sand the reproductive organs plasticity in terms of pollination biology. Rhododendron przewalskii is a typical alpine shrub on the Southeastern edge of Tibetan Plateau. This study is a comparative and correlational analysis of the floral traits of R. prezwalskii at different aspects. Our results showed: 1) The soil temperature and pH value at the east aspect are significantly greater than those at the northeast aspect (P = 0.02, P = 0.001), and the soil bulk density is significantly smaller than that of the northeast aspect ( P < 0.001). Other soil factors have no significant differences between two slope aspects. 2) The flower size of R.przewalskii is significantly different at two aspects. The flower size was greater at the east aspect (Floral opening diameter: 22.74 ± 0.15 mm; Corolla tube length: 19.86 ± 0.56 mm) than those at the northeast aspect (21.00 ± 0.12 mm; 21.00 ± 0.12 mm). The pistil length was also significantly larger at the eastern aspect as compared to the northeast. However, the stigma exsertion presents a contradictory result. In addition, no significant difference exists about the size and shape of the stigma between two different aspects. Floral traits had larger variations between individuals and aspects. Coefficient of variation (CV) of stigma size is greater (29.13%) at the east aspects while stigma exsertion’s CV is larger (28.03%)at northeast aspect, respectively. 3) Floral opening diameter and Corolla tube length, pistil length and pedicel length , style length and pistil length and pedicel length, ovary length and pistil length significantly positively correlates at both aspects (East: P < 0.001, P < 0.001, P < 0.01 ; P < 0.001; P < 0.001; Northeast: P < 0.001, P < 0.001, P < 0.01 ; P < 0.001; P < 0.001). Besides, stigma size and style length, pistil length also have significant positive correlations with the pedicel length at the east aspect ( P <0.01 , P <0.001, P <0.01 ), and the stigma size is significantly positively correlated with the ovary length at the northeast aspect ( P = 0.01 ) while significantly negatively correlated with the stigma shape (P = 0.02 ). 4)The floral opening diameter and the corolla tube length has an allometric growth relationship at the east aspect with each other but an isometric growth relationship at the northeast aspect. Moreover, floral opening diameter tends to be increase at the east aspect in terms of trade-offs between functional traits of pollination biology, while the flower prefers to regulate stigma exsertion at the northeast aspect for better reproduction efficiency. The study reveals that floral traits of R. przewalskii vary with changes in aspect, which enables them to avail higher reproductive opportunities in a heterogeneous alpine habitat. The trade-off of floral traits and their preferences at different aspects is a crucial evolutionary adaption that ensures the survival of R. przewalskii in a heterogeneous alpine environment.

备注/Memo

备注/Memo:
收稿日期 Received: 2020-05-02 接受日期 Accepted: 2020-07-13
国家自然科学基金项目(41661144045;31971436)和中国科学院西北生态环境与资源研究院冰冻圈国家重点实验室开放课题(SKLCS-OP-2018-07)资助 Supported by National Natural Science Foundation of China (41661144045;31971436) and State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy Sciences (SKLCS-OP-2018-07)
**通讯作者 Corresponding author (E-mail: 964734080@qq.com; wangjn@cib.ac.cn )
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更新日期/Last Update: 2020-08-04