Brassinosteroids promote development of rice pollen grains and seeds by triggering expression of Carbon Starved Anther, a MYB domain protein

The Plant Journal : for Cell and Molecular Biology
Xiaolei ZhuDabing Zhang

Abstract

Transport of photoassimilates from leaf tissues (source regions) to the sink organs is essential for plant development. Here, we show that a phytohormone, the brassinosteroids (BRs) promotes pollen and seed development in rice by directly promoting expression of Carbon Starved Anther (CSA) which encodes a MYB domain protein. Over-expression of the BR-synthesis gene D11 or a BR-signaling factor OsBZR1 results in higher sugar accumulation in developing anthers and seeds, as well as higher grain yield compared with control non-transgenic plants. Conversely, knockdown of D11 or OsBZR1 expression causes defective pollen maturation and reduced seed size and weight, with less accumulation of starch in comparison with the control. Mechanically, OsBZR1 directly promotes CSA expression and CSA directly triggers expression of sugar partitioning and metabolic genes during pollen and seed development. These findings provide insight into how BRs enhance plant reproduction and grain yield in an important agricultural crop.

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Citations

Dec 10, 2015·Frontiers in Plant Science·Krishna S V JagadishNese Sreenivasulu
Aug 18, 2016·Journal of Experimental Botany·Juanying YeHong Ma
Mar 11, 2018·Plant Reproduction·Na LiYunhai Li
Nov 1, 2017·Nature Plants·Xufeng BaiYongzhong Xing
Aug 23, 2019·The Plant Journal : for Cell and Molecular Biology·Ze-Hua GuoMee-Len Chye
Jan 8, 2020·The Plant Journal : for Cell and Molecular Biology·Meng-Yu YanJing-Quan Yu
Mar 4, 2020·International Journal of Molecular Sciences·Jinshan CaoYouning Wang
Mar 16, 2017·The New Phytologist·Jingya YuanZ Jeffrey Chen
Apr 4, 2019·International Journal of Molecular Sciences·Shuping WangGaisheng Zhang
Jul 1, 2020·Frontiers in Plant Science·Wen-Hui Lin
Nov 19, 2020·Journal of Experimental Botany·Fuai SunHaoqiang Yu
Mar 20, 2021·Journal of Agricultural and Food Chemistry·Boqing ZhaoFang Yuan
Aug 4, 2021·Plant Biotechnology Journal·Li ZhangShanguo Yao

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