别开生面:被子植物受精机制研究的新发现

Out of the Road:Novel Finding in Regulatory Mechanism of Angiosperm Fertilization

被子植物受精调控机制一直是植物有性生殖领域的研究热点之一。近年来,对于花粉管导向、防止多精入卵以及受精恢复系统启动等关键过程的研究有了快速进展。但迄今发现的主要调控途径均为基于助细胞功能、旨在确保双受精成功的机制,而对基于中央细胞确保双受精成功的机制仍知之甚少。近期,李红菊研究组在该领域取得了新的突破,他们发现中央细胞也能够分泌吸引花粉管的小肽,进而揭示了一条全新的不依赖于助细胞的受精恢复途径,填补了对受精机制认识的一个空白。

Angiosperm fertilization has been a hot topic in the field of sexual plant reproduction.In recent years,great advances have been made in the studies on some critical steps,such as pollen tube guidance,polytubey block,and fertilization recovery system.However,most of these known mechanisms are synergid cell-based for ensuring successful double fertilization,the counterpart system based on central cell remains poorly understood.A recently published paper from Hongju Li’s lab revealed that the central cell could also secrete peptides as pollen tube attractants to guide the pollen tube entering embryo sac to ensure double fertilization.Interestingly,this mechanism is not synergid-dependent.Thus,the authors revealed a novel fertilization recovery system and bridged a gap in understanding the mechanism underlying double fertilization.