Effects of heterospecific pollen on stigma behavior in Campsis radicans: Causes and consequences
Effects of heterospecific pollen on stigma behavior in Campsis radicans: Causes and consequences
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DOI：
10.1002/ajb2.1865
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发表时间：
2022-05-30
影响因子：
3
通讯作者：
Wang，Xiao-Fan
中科院分区：
文献类型：
--
作者：
Zou，Ting-Ting;Wang，Chun-Hui;Wang，Xiao-Fan
PremisePollinator共享共花植物可能会导致种间花粉接收与健身成本。然而，决定异源花粉（HP）影响的潜在因素尚未完全了解。此外，HP诱导的柱头闭合的成本对于具有特殊触敏柱头的植物可能比具有非触敏柱头的植物更严重。很少有研究评估HP对柱头behaviors.MethodsWe进行了手授粉实验与10 HP捐助者估计HP对柱头行为和柱头花粉萌发inCampsis radicans（紫葳科）在低和高花粉负荷的影响。我们评估了供体和受体之间的系统发育距离，花粉大小和花粉孔数介导HP效应的作用。此外，我们观察了花粉管生长，以确定同种花粉管生长advantage.ResultsStigma行为显着不同物种的HP。随着花粉量的增加，花粉粒的大小、柱头萌发率和永久闭合率逐渐减小。柱头HP萌发率随气孔数的增加而增加。然而，HP效应不依赖于系统发育距离。此外，同种花粉有一个花粉管生长的优势，超过HP。ConclusionsOur结果提供了一个很好的基础，了解植物类群的柱头花粉识别过程与触摸敏感的柱头。我们的结论是，某些开花性状驱动授粉后时期的HP效应。为了更好地了解传粉者共享和种间花粉转移对植物进化的影响，我们强调了在社区水平上评估更多决定HP效应的因素的重要性。
PremisePollinator sharing of co‐flowering plants may result in interspecific pollen receipt with a fitness cost. However, the underlying factors that determine the effects of heterospecific pollen (HP) are not fully understood. Moreover, the cost of stigma closure induced by HP may be more severe for plants with special touch‐sensitive stigmas than for plants with non‐touch‐sensitive stigmas. Very few studies have assessed HP effects on stigma behavior.MethodsWe conducted hand‐pollination experiments with 10 HP donors to estimate HP effects on stigma behavior and stigmatic pollen germination inCampsis radicans(Bignoniaceae) at low and high pollen loads. We assessed the role of phylogenetic distance between donor and recipient, pollen size, and pollen aperture number in mediating HP effects. Additionally, we observed pollen tube growth to determine the conspecific pollen‐tube‐growth advantage.ResultsStigma behavior differed significantly with HP of different species. Pollen load increased, while pollen size decreased, the percentage of permanent closure and stigmatic germination of HP. Stigmatic HP germination increased with increasing aperture number. However, HP effects did not depend on phylogenetic distance. In addition, conspecific pollen had a pollen‐tube‐growth advantage over HP.ConclusionsOur results provide a good basis for understanding the stigma‐pollen recognition process of plant taxa with touch‐sensitive stigmas. We concluded that certain flowering traits drive the HP effects on the post‐pollination period. To better understand the impact of pollinator sharing and interspecific pollen transfer on plant evolution, we highlight the importance of evaluating more factors that determine HP effects at the community level.