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Pollen-Pistil Interactions as Reproductive Barriers
Annual Review of Plant Biology ( IF 21.3 ) Pub Date : 2021-06-18 , DOI: 10.1146/annurev-arplant-080620-102159
Amanda K Broz 1 , Patricia A Bedinger 1
Affiliation  

Pollen-pistil interactions serve as important prezygotic reproductive barriers that play a critical role in mate selection in plants. Here, we highlight recent progress toward understanding the molecular basis of pollen-pistil interactions as reproductive isolating barriers. These barriers can be active systems of pollen rejection, or they can result from a mismatch of required male and female factors. In some cases, the barriers are mechanistically linked to self-incompatibility systems, while others represent completely independent processes. Pollen-pistil reproductive barriers can act as soon as pollen is deposited on a stigma, where penetration of heterospecific pollen tubes is blocked by the stigma papillae. As pollen tubes extend, the female transmitting tissue can selectively limit growth by producing cell wall–modifying enzymes and cytotoxins that interact with the growing pollen tube. At ovules, differential pollen tube attraction and inhibition of sperm cell release can act as barriers to heterospecific pollen tubes.

中文翻译:


花粉-雌蕊相互作用作为生殖障碍

花粉-雌蕊相互作用是重要的合子前生殖屏障,在植物的配偶选择中起关键作用。在这里,我们强调了最近在理解花粉-雌蕊相互作用作为生殖隔离障碍的分子基础方面取得的进展。这些障碍可能是花粉排斥的主动系统,也可能是由于所需的男性和女性因素不匹配造成的。在某些情况下,障碍在机械上与自不相容性系统相关联,而另一些则代表完全独立的过程。一旦花粉沉积在柱头上,花粉-雌蕊生殖屏障就会起作用,在柱头乳头阻止异种花粉管的渗透。随着花粉管的延伸,雌性传播组织可以通过产生与生长的花粉管相互作用的细胞壁修饰酶和细胞毒素来选择性地限制生长。在胚珠,不同的花粉管吸引和精子细胞释放的抑制可以作为异种花粉管的障碍。

更新日期:2021-06-19
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