Endosperm cellularization failure induces a dehydration-stress response leading to embryo arrest

• DOI: 10.1093/plcell/koac337
• Publication Date: 2022-11-25T17:29:30Z
• Authors: Wenjia Xu; Hikaru Sato; Heinrich Bente; Juan Santos-González; Claudia Köhler
• Keywords: 580; 0301 basic medicine; Dehydration; Arabidopsis Proteins; [SDV.BBM]Life Sciences [q-bio]/Biochemistry; Botany; Arabidopsis; Cell Biology; Triploidy; Endosperm; 03 medical and health sciences; Gene Expression Regulation, Plant; Seeds; [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology; Plant Biotechnology; Molecular Biology; Research Article

Abstract The endosperm is a nutritive tissue supporting embryo growth in flowering plants. Most commonly, the initially develops as coenocyte (multinucleate cell) and then cellularizes. This process of cellularization frequently disrupted hybrid seeds generated by crosses between different plant species or plants that differ ploidy, resulting arrest seed lethality. reason for upon failure remains unclear. In this study, we show triploid Arabidopsis thaliana embryos surrounded uncellularized mount an osmotic stress response connected to increased levels abscisic acid (ABA) enhanced ABA responses. Impairing biosynthesis signaling aggravated abortion, while increasing endogenous well exogenous application ABA-induced suppressed arrest. Taking these results together, propose required establish dehydration tolerance developing embryo, ensuring its survival during maturation.