Nitrogen Mediates Flowering Time and Nitrogen Use Efficiency via Floral Regulators in Rice

第一作者：Shunan Zhang

第一单位：南京农业大学

通讯作者：Guohua Xu

 Abstract 

研究背景：High nitrogen (N) fertilization for maximizing crop yield commonly leads to postponed flowering time (heading date in rice) and ripening, thus affecting resources use efficiency and followed planting time.

主要发现：We found that N-mediated heading date-1 (Nhd1) can directly activate florigen gene OsHd3a in rice.

结果1-Nhd1或OsHd3a失活：Inactivation of either Nhd1 or OsHd3a results in delay and insensitivity to N supply of flowering time.

结果2-Nhd1敲除：Knockout of Nhd1 increases N uptake and utilization efficiency at low-to-moderate N level under both short- and long-day field conditions.

结果3-谷氨酰胺：Increasing glutamine, the product of N assimilation, can upregulate expression of Nhd1, which in turn downregulates OsFd-GOGAT expression and OsFd-GOGAT activity, displaying a Nhd1-controlled negative feedback regulatory pathway of N assimilation.

结果4-Nhd1介导的开花时间调控：Moreover, N fertilization effect on rice flowering time shows genetically controlled diversity, and single-nucleotide polymorphism in Nhd1 promoter may relate to different responses of flowering time to N application.

结论：Nhd1 thus balances flowering time and N use efficiency in addition to photoperiod in rice.

doi: https://doi.org/10.1016/j.cub.2020.10.095

Journal: Current Biology

Published date: Dec 04, 2020