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Male sterility significantly elevates shape variation and fluctuating asymmetry of zygomorphic corolla in gynodioecious Glechoma hederacea (Lamiaceae)
AoB Plants ( IF 2.9 ) Pub Date : 2021-04-05 , DOI: 10.1093/aobpla/plab013
Jiri Neustupa 1 , Katerina Woodard 1
Affiliation  

Female flowers of gynodioecious plants usually have smaller corollas than bisexual flowers. This difference is explained as a developmental consequence of stamen abortion and as a result of stronger selection for larger corolla size in hermaphroditic flowers that solely ensure male function within populations. This study evaluated whether the size difference of zygomorphic corollas in a widely distributed gynodioecious herb Glechoma hederacea is accompanied by variation in shape and bilateral fluctuating asymmetry of sexually differentiated flowers. Geometric morphometric analyses of bilateral symmetry in the shapes of corolla lower lips showed that male-sterile flowers were significantly more plastic and asymmetric, implying that they may be subjected to weaker stabilizing selection for corolla shape in comparison to hermaphrodites. These results illustrated that sexual differentiation may be an important factor contributing to bilateral fluctuating asymmetry in the shape of zygomorphic flowers.

中文翻译:

雄性不育显着提高雌雄异株 Glechoma hederacea (Lamiaceae) 左右对称花冠的形状变异和波动不对称性

雌雄异株植物的雌花通常比两性花的花冠更小。这种差异被解释为雄蕊流产的发育结果,也是雌雄同体花中更大花冠尺寸的更强选择的结果,这仅确保了种群内的雄性功能。本研究评估了广泛分布的雌雄异株草本植物Glechoma hederacea中左右形花冠的大小差异是否伴随有性分化花的形状变化和双侧波动不对称。对花冠下唇形状双边对称性的几何形态学分析表明,雄性不育花的可塑性和不对称性明显更高,这意味着与雌雄同体相比,它们对花冠形状的稳定性选择可能较弱。
更新日期:2021-04-05
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