Brassinosteroids mediate the effect of soil-drying during meiosis on spikelet degeneration in rice

• DOI: 10.1016/j.envexpbot.2019.103887
• Publication Date: 2019-09-21T14:41:56Z
• Authors: Weiyang Zhang; Jiayan Sheng; Lidong Fu; Yunji Xu; Fei Xiong; Yunfei Wu; Weilu Wang; Zhiqin Wang; Jianhua Zhang; Jianchang Yang
• Keywords: Panicle; Degeneration (medical)

This study investigated whether and how brassinosteroids (BRs) mediate the effect of soil-drying during meiosis on spikelet degeneration in rice (Oryza sativa L.). A field-grown cultivar was exposed to three soil moisture treatments meiosis: well-watered (WW), moderate (MD) severe (SD). Compared with WW treatment, MD treatment enhanced BRs biosynthesis, reduced degeneration, increased grain yield. The SD had opposite effects. Changes levels adenosine triphosphate (ATP), energy charge, activities enzymes involved metabolism, including cytochrome C oxidase (CCO) succinate dehydrogenase (SDH), total antioxidant capacity (T-AOC) were consistent those levels, whereas hydrogen peroxide (H2O2) content, vacuolar processing enzyme genes (OsVPE2 OsVPE3) expression degree nuclear DNA fragmentation showed trend. Knockdown synthesis gene OsD11 or application a biosynthesis inhibitor young panicles vastly decreased ATP contents, CCO SDH activities, T-AOC but H2O2 OsVPE2 OsVPE3 expression, compared control, effects observed when exogenous applied. Therefore, likely elevated inhibit under by elevating status.