首页> 外文期刊>Plant Systematics and Evolution >Context-dependent style curvature in Kosteletzkya virginica (Malvaceae) offers reproductive assurance under unpredictable pollinator environments
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Context-dependent style curvature in Kosteletzkya virginica (Malvaceae) offers reproductive assurance under unpredictable pollinator environments

机译:在不可预测的授粉媒介环境下,科斯特列茨科尼亚(锦葵科)的上下文相关样式曲率提供了繁殖保证

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摘要

Delayed selfing is a reproductive strategy that can increase mating opportunities and provide reproductive assurance in the absence of pollinators. When external pollination fails to occur in the herbaceous perennial, Kosteletzkya virginica, the styles curve downward to bring anthers into contact with the stigmal lobes, resulting in delayed selfing. Our goal was to evaluate experimentally the effects of weather conditions on pollinator activity, style curvature, and plant fitness. We discovered that adverse weather conditions significantly reduced pollinator visitation rates, and increased the incidence of style curvature, which resulted in delayed selfing. Furthermore, elimination of delayed selfing by experimental manipulation reduced fruit and seed set compared to non-emasculated flowers, even under adverse weather conditions. Offspring produced through selfing were similar to outcrossed progeny in the majority of fitness traits measured, and inbreeding depression was limited. Our study demonstrates that context-dependent style curvature promotes delayed selfing and provides reproductive assurance in the absence of pollinators, with minimal loss of progeny performance through inbreeding depression.
机译:延迟自交是一种繁殖策略,可以在没有传粉媒介的情况下增加交配机会并提供繁殖保证。当多年生草本植物Kosteletzkya virginica没有发生外部授粉时,花柱向下弯曲,使花药与小叶接触,导致自交延迟。我们的目标是通过实验评估天气条件对传粉媒介活动,花型弯曲和植物适应性的影响。我们发现不利的天气条件显着降低了传粉者的访视率,并增加了花型弯曲的发生率,从而导致自交延迟。此外,即使在不利的天气条件下,与未去梗的花相比,通过实验操作消除延迟的自交也减少了果实和结实。在大多数测量到的适应性状中,通过自交产生的后代与异交后代相似,并且近交抑郁感很有限。我们的研究表明,上下文依赖的样式曲率可促进延迟自交,并在没有授粉媒介的情况下提供繁殖保证,并且通过近亲衰退而造成的后代性能损失最小。

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