Scaffold protein RACK1A positively regulates leaf senescence by coordinating the EIN3‐miR164‐ORE1 transcriptional cascade in Arabidopsis

ABSTRACT Plants have adopted versatile scaffold proteins to facilitate the crosstalk between multiple signaling pathways. Leaf senescence is a well‐programmed developmental stage that is coordinated by various external and internal signals. However, the functions of plant scaffold proteins in respon...

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Published in:Journal of integrative plant biology 2023-07, Vol.65 (7), p.1703-1716
Main Authors: Masood, Jan, Zhu, Wei, Fu, Yajuan, Li, Zhiyong, Zhou, Yeling, Zhang, Dong, Han, Huihui, Yan, Yan, Wen, Xing, Guo, Hongwei, Liang, Jiansheng
Format: Article
Language:English
Subjects:
Arabidopsis
Developmental stages
Ethylene
ethylene signaling
Kinases
leaf senescence
Leaves
Plant hormones
Proteins
RACK1
scaffold protein
Scaffolds
Senescence
Transcription
transcriptional cascade
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Summary:ABSTRACT Plants have adopted versatile scaffold proteins to facilitate the crosstalk between multiple signaling pathways. Leaf senescence is a well‐programmed developmental stage that is coordinated by various external and internal signals. However, the functions of plant scaffold proteins in response to senescence signals are not well understood. Here, we report that the scaffold protein RACK1A (RECEPTOR FOR ACTIVATED C KINASE 1A) participates in leaf senescence mediated by ethylene signaling via the coordination of the EIN3‐miR164‐ORE1 transcriptional regulatory cascade. RACK1A is a novel positive regulator of ethylene‐mediated leaf senescence. The rack1a mutant exhibits delayed leaf senescence, while transgenic lines overexpressing RACK1A display early leaf senescence. Moreover, RACK1A promotes EIN3 (ETHYLENE INSENSITIVE 3) protein accumulation, and directly interacts with EIN3 to enhance its DNA‐binding activity. Together, they then associate with the miR164 promoter to inhibit its transcription, leading to the release of the inhibition on downstream ORE1 (ORESARA 1) transcription and the promotion of leaf senescence. This study reveals a mechanistic framework by which RACK1A promotes leaf senescence via the EIN3‐miR164‐ORE1 transcriptional cascade, and provides a paradigm for how scaffold proteins finely tune phytohormone signaling to control plant development. The scaffold protein RACK1A facilitates ethylene signaling for leaf senescence via the ETHYLENE INSENSITIVE 3‐miR164‐ORESARA 1 transcriptional regulatory cascade, which provides insights into how scaffold proteins finely tune phytohormone signaling to control plant development.
ISSN:1672-9072
1744-7909
DOI:10.1111/jipb.13483