小檗科(Epimedium chlandrum Stearn)的花特性及授粉生物学

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
Yi-fan Qian, Wen Du, Lan-ying Chen, Qiu-mei Quan, Yun-xiang Li
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引用次数: 0

摘要

花性状的进化和表达是对生物和非生物因素选择压力的响应。虽然花的性状在不同的环境中有显著的差异,但花的性状是不变的。本研究旨在了解淫羊藿(Epimedium chlorandrum)花性状对频繁的夜间多雨和潮湿环境的适应性,以及花性状在传粉和繁殖中的作用。我们观察了开花物候,测量了花的特征,包括每朵花的花粉粒数和胚珠数,测量了花粉活力和柱头接受度,测试了花蜜的体积和糖浓度,并进行了花的访问观察。采用不同的授粉处理来表征育种系统。花药的内萼片和高度弯曲的较长的刺共同形成伞,保护花药和柱头免受雨水冲刷,防止花蜜稀释。有6种蝇类访花,唯一有效的传粉者为三叶蜂,以花蜜为食。当糖浓度为29.19 g/100 ml时,一朵花的花蜜分泌量约为17.06 μL,花蜜糖浓度与三头莲的授粉效率呈正相关。与异花授粉处理相比,自花授粉和开放授粉处理的可育种子较少。相比之下,自主自花授粉处理未能产生可育种子。综上所述,由于恶劣天气和传粉者短缺导致的花粉限制在绿头莲授粉过程中发生,自交性部分缓解了这一限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Floral traits and pollination biology of Epimedium chlorandrum Stearn (Berberidaceae)
The evolution and expression of floral traits are responses to selection pressure from biotic and abiotic factors. Although floral traits significantly vary among environments, the flower remains unchanged. We aimed to understand the adaptation of Epimedium chlorandrum of floral traits to a frequently nocturnally rainy and wet environment and the roles of floral traits in pollination and reproduction. We observed flowering phenology, measured floral characteristics including the number of pollen grains and ovules per flower, measured pollen viability and stigma receptivity, tested the volume and sugar concentration of nectar, and conducted flower-visit observations in this species. Different pollination treatments were performed to characterize the breeding system. The inner sepals and highly curved longer spurs of E. chlorandrum jointly formed an umbrella that shielded the anthers and stigma from rain wash and prevented nectar dilution. E. chlorandrum was visited by six species, while Bombus trifasciatus was the only effective pollinator and fed on the nectar. One flower secreted approximately 17.06 μL of nectar with a 29.19 g/100 ml sugar concentration, and the pollination efficiency of B. trifasciatus was positively associated with the nectar sugar concentration. The self- and open-pollination treatments resulted in fewer fertile seeds than the cross-pollination treatment. In contrast, the autonomous self-pollination treatment failed to yield fertile seeds. In summary, pollen limitation caused by harsh weather and pollinator shortage occurred during the pollination process of E. chlorandrum, which was partially alleviated by self-compatibility.
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来源期刊
Journal of Plant Ecology
Journal of Plant Ecology 生物-植物科学
CiteScore
4.60
自引率
18.50%
发文量
134
审稿时长
3 months
期刊介绍: Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.
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