Higashiyama Tetsuya, Yang Wei-Cai
Institute of Transformative Bio-Molecules, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan (T.H.);
Division of Biological Science, Graduate School of Science, and JST ERATO Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan (T.H.); and
Plant Physiol. 2017 Jan;173(1):112-121. doi: 10.1104/pp.16.01571. Epub 2016 Dec 5.
Pollen tube guidance in flowering plants is a unique and critical process for successful sexual reproduction. The pollen tube that grows from pollen, which is the male gametophyte, precisely navigates to the embryo sac, which is the female gametophyte, within the pistil. Recent advances have clarified the molecular framework of gametophytic pollen tube guidance. Multiple species-specific attractant peptides are secreted from synergid cells, the proper development and function of which are regulated by female gametes. Multiple receptor-like kinases on the pollen tube tip are involved in sensing species-specific attractant peptides. In this Update article, recent progress in our understanding of the mechanism of gametophytic pollen tube guidance is reviewed, including attraction by synergid cells, control of pollen tube guidance by female gametes, and directional growth of the pollen tube by directional cue sensing. Future directions in the study of pollen tube guidance also are discussed.
开花植物中的花粉管导向是成功进行有性生殖的一个独特且关键的过程。从花粉（雄配子体）生长出的花粉管会在雌蕊内精确地导航至胚囊（雌配子体）。最近的进展已阐明了配子体花粉管导向的分子框架。多种物种特异性吸引肽从助细胞分泌，助细胞的正常发育和功能受雌配子调控。花粉管顶端的多种类受体激酶参与感知物种特异性吸引肽。在这篇综述文章中，我们回顾了对配子体花粉管导向机制理解的最新进展，包括助细胞的吸引作用、雌配子对花粉管导向的控制以及通过定向线索感知实现的花粉管定向生长。还讨论了花粉管导向研究的未来方向。
