Journal
PLANT JOURNAL
Volume 82, Issue 4, Pages 570-581Publisher
WILEY-BLACKWELL
DOI: 10.1111/tpj.12820
Keywords
brassinosteroids; pollen grains; seeds; carbon starved anther; development; regulatory cascade
Categories
Funding
- National Natural Science Foundation of China [31230051, 91417311, 31110103915]
- China Innovative Research Team, Ministry of Education
- 111 Project [B14016]
- National Key Basic Research Developments Program, Ministry of Science and Technology, China [2013CB126902, 2011CB100101]
- 863 High-Tech Project, Ministry of Science and Technology, China [2011AA10A101, 2012AA10A302]
- School of Agriculture, Food and Wine, The University of Adelaide
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available