Maternal nitric oxide homeostasis impacts female gametophyte development under optimal and stress conditions

• DOI: 10.1093/plcell/koae043
• Publication Date: 2024-02-20T17:20:45Z
• Authors: Junzhe Wang; Xiaolong Guo; Yijin Chen; Tianxiang Liu; Jianchu Zhu; Shengbao Xu; Elizabeth Vierling
• Keywords: Homeostasis

Abstract In adverse environments, the number of fertilizable female gametophytes (FGs) in plants is reduced, leading to increased survival remaining offspring. How maternal plant perceives internal growth cues and external stress conditions alter FG development remains largely unknown. We report that homeostasis signaling molecule nitric oxide (NO) plays a key role controlling under both optimal conditions. NO precisely regulated by S-nitrosoglutathione reductase (GSNOR). Prior fertilization, GSNOR protein exclusively accumulated sporophytic tissues indirectly controls Arabidopsis (Arabidopsis thaliana). null mutants, species degenerating nucellus, auxin efflux into developing was restricted, which inhibited development, resulting reduced fertility. Importantly, restoring expression maternal, but not gametophytic tissues, or increasing substrate significantly proportion normal FGs Furthermore, overexpression added fertility drought salt stress. These data indicate critical transport control turn determine seed yield. Understanding this aspect could contribute mediating yield loss