Loss of OsAID2 function affects anther secondary cell wall development and filament elongation in rice

초록

In plants successful reproduction is achieved through various developmental processes. Among them, anther dehiscence is a crucial event in reproductive development and results in the release of pollen grains for pollination and fertilization. This event involves complex developmental steps including tapetum degeneration filament elongation swelling of lodicule and along with the influence of phytohormones. In particular, phytohormones play a crucial role in plant development and exert their influence even at low levels. Here, we report that Oryza sativa ANTHER INDEHISCENCE2 OsAID2 is involved in anther dehiscence and spikelet fertilization in rice. The osaid2 mutants exhibit pleiotropic phenotypes of altered flowering time reduced tiller and spikelet number abnormal floral organ development and spikelet sterility under paddy field conditions. We found that the main cause of spikelet sterility in osaid2 was poor anther dehiscence rather than pollen viability by microscopic observations.