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米基本螺旋环螺旋环079 (OsbHLH079) 通过减弱ABA信号延迟叶子衰老

Suk-Hwan Kim¹, Jungwon Yoon¹, Hanna Kim¹

¹Department of Agriculture, Forestry and Bioresources, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea.

Rice (New York, N.Y.)

|December 13, 2023

概括

OsbHLH079,一种基本的螺旋环-螺旋环转录因子,通过降低与衰老相关的基因和ABA信号的调节,延迟了叶子衰老. 过度表达导致保持绿色的表型,而淘汰会加速叶子的黄色化.

科学领域:

植物分子生物学植物分子生物学
植物生理学植物生理学

背景情况:

叶子衰老是一个关键的发育阶段,涉及营养的重新分配.
像NAC,WRKY和MYB这样的转录因子 (TF) 调节衰老,但bHLH TF的作用不太了解.
植物激素,特别是酸 (ABA),影响衰老的进展.

研究的目的:

研究基本螺旋环螺旋转录因子OsbHLH079在调节叶子衰老中的功能.
确定OsbHLH079控制衰老相关基因 (SAG) 和ABA信号的分子机制.

主要方法:

在叶子衰老过程中对OsbHLH079表达的分析.
OsbHLH079过度表达和淘汰突变体的表型特征.
定量实时PCR (RT-qPCR) 来评估SAG,叶绿素降解基因 (CDG) 和ABA信号基因.
双露西法酶记者测定以确认转录调节.

主要成果:

OsbHLH079的过度表达赋予了一种保持绿色的表型,延迟了自然和黑暗诱导的衰老.
osbhlh079淘汰突变体表现出加速的叶子衰老.
OsbHLH079的表达随着衰老而增加,对SAG和CDG产生负面调节.
OsbHLH079通过降低ABA信号基因 (OsABF2,OsABF4,OsABI5,OsNAP) 的调节来抑制ABA诱导的衰老.

结论:

OsbHLH079作为叶子衰老的负调节剂.
通过减弱ABA反应,bHLH TF OsbHLH079延迟了叶子的黄色变化.
OsbHLH079代表了一种用于调节植物叶子衰老的新目标.

关键词:

亚酸信号传递亚酸信号传递基本的螺旋环螺旋转录因子.叶子衰老叶子衰老这就是OsbHLH079的原因.大米大米大米大米大米与衰老相关的转录因子

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