Deficiency of very long chain alkanes biosynthesis causes humidity-sensitive male sterility via affecting pollen adhesion and hydration in rice

作  者:Yu B, Liu LT, Wang T*
影响因子:5.624
刊物名称:Plant Cell and Environment
出版年份:2019
卷:  期:  页码:DOI: 10.1111/pce.13637

论文摘要:

Pollen adhesion and hydration are the earliest events of the pollen–stigma interactions, which allow compatible pollen to fertilize egg cells, but the underlying mechanisms are still poorly understood. Rice pollen are wind dispersed, and its pollen coat contains less abundant lipids than that of insectpollinated plants. Here, we characterized the role of OsGL14, a rice member of the Glossy family, in pollen adhesion and hydration. OsGL14 is preferentially expressed in pollen and tapetal cells and is required for the synthesis of very long chain alkanes. osgl14 mutant generated apparently normal pollen but displayed excessively fast dehydration at anthesis and defective adhesion and hydration under normal condition, but the defective adhesion and hydration were rescued by high humidity. Gas chromatography–mass spectrometry analysis suggested that the humiditysensitive male sterility of osgl14 was probably due to a significant reduction in C25 and C27 alkanes. These results indicate that very long chain alkanes are components of rice pollen coat and control male fertility via affecting pollen adhesion and hydration in response to environmental humidity. Moreover, we proposed that a critical point of water content in mature pollen is required for the initiation of pollen adhesion.

全文链接:https://onlinelibrary.wiley.com/doi/full/10.1111/pce.13637