神农架野外实习 二强雄蕊花丝退化与花粉数目关系探究 刘雨笑张潇琪1周畅2(复旦大学生命科学学院上海20083 周志霄2王一航2曾志稳2冯俊淞3徐文明3《武汉大学生命科学院武汉430z) 摘要:二强雄蕊是被子植物花中雄蕊存在的一种分化形式,常见于筒状虫媒花 鉴于花丝较强的雄蕊在传粉上具有一定位置优势,设想二强雄蕊花丝分化与花药 及花粉粒大小、数目、开裂时间等花药分化具有相关性。本次课题以花粉粒数目 为主要探究方向,小组成员选取四个科八种植物按花丝长短分别进行花粉粒数目 统计,多数与预期相符,即两对高位雄蕊的花粉粒数目优于低位雄蕊花粉粒数目, 此可能与植物更高效利用能量相关,而在实验中也观察到与预期有差异的现象, 还需进一步实验。花内雄蕊分化性状繁多,不仅可作为植物分类重要特征,且对 环境具有多种适应意义并与进化相关,涉及与植物繁殖关联的多种互作,这一领 域具有重要研究前景 关键词ε二强雄蕊,花粉计数,进化策略 The connection between the degradation of filaments and the number of pollen grains in didynamous stamen Yuxiao Liu, Xiaoqi Zhang, Chang Zhou School ofLife Sciences, Fudan University Shanghai 200433 Zhix iao Zhou, Yihang Wang, Zhiwen Zeng Junsong Feng, Wenming Xu School of life Sciences, Wuhan University Wuhan 430072 Abstract: Didynamous stamen is a differentiation of stamens in Angiosperm, which mostly exists in species with tubular entomophilous flowers. As the longer pair of stamens will obviously gain advantages during pollination because of their position is more closer to the edge of the flower, authors think the differences between the two pair of the stamens might not only showed in the length of filaments, but also have connections with the sizes, numbers of pollen grains and the timings of pollen cracking. In this research, the team focuses on the differences between the numbers of pollen grains in the different sizes of stamens in each species. Researchers choose 8 species in total from 4 families and collect some samples to count the number of pollen grains in each pair of stamens. Most of the results have achieved the predication that longer stamen pairs will contain much more pollen grains than those shorter ones in the same flower, and they might indicate that didynamous stamen is a神农架野外实习 二强雄蕊花丝退化与花粉数目关系探究 刘雨笑 1 张潇琪 1 周畅 2 （复旦大学生命科学学院 上海 200433） 周志霄 2 王一航 2 曾志稳 2 冯俊淞 3 徐文明 3 （武汉大学生命科学学院 武汉 430072） 摘要：二强雄蕊是被子植物花中雄蕊存在的一种分化形式，常见于筒状虫媒花。 鉴于花丝较强的雄蕊在传粉上具有一定位置优势，设想二强雄蕊花丝分化与花药 及花粉粒大小、数目、开裂时间等花药分化具有相关性。本次课题以花粉粒数目 为主要探究方向，小组成员选取四个科八种植物按花丝长短分别进行花粉粒数目 统计，多数与预期相符，即两对高位雄蕊的花粉粒数目优于低位雄蕊花粉粒数目， 此可能与植物更高效利用能量相关，而在实验中也观察到与预期有差异的现象， 还需进一步实验。花内雄蕊分化性状繁多，不仅可作为植物分类重要特征，且对 环境具有多种适应意义并与进化相关，涉及与植物繁殖关联的多种互作，这一领 域具有重要研究前景。 关键词：二强雄蕊，花粉计数，进化策略 The connection between the degradation of filaments and the number of pollen grains in didynamous stamen Yuxiao Liu1 , Xiaoqi Zhang1 ,Chang Zhou2 School of Life Sciences, Fudan University, Shanghai 200433 Zhixiao Zhou2 , Yihang Wang2 , Zhiwen Zeng2 , Junsong Feng3 , Wenming Xu3 School of Life Sciences, Wuhan University, Wuhan 430072 Abstract：Didynamous stamen is a differentiation of stamens in Angiosperm, which mostly exists in species with tubular entomophilous flowers. As the longer pair of stamens will obviously gain advantages during pollination because of their position is more closer to the edge of the flower, authors think the differences between the two pair of the stamens might not only showed in the length of filaments, but also have connections with the sizes, numbers of pollen grains and the timings of pollen cracking. In this research, the team focuses on the differences between the numbers of pollen grains in the different sizes of stamens in each species. Researchers choose 8 species in total from 4 families and collect some samples to count the number of pollen grains in each pair of stamens. Most of the results have achieved the predication that longer stamen pairs will contain much more pollen grains than those shorter ones in the same flower, and they might indicate that didynamous stamen is a