ZmmiR169q/ZmNF-YA8 is a module that homeostatically regulates primary root growth and salt tolerance in maize

In response to salt stress, plants alter the expression of manifold gene networks, enabling them to survive and thrive in the face of adversity. As a result, the growth and development of plant roots could be drastically altered, with significant inhibition of the growth of root meristematic zones....

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Bibliographic Details
Published in:	Frontiers in plant science Vol. 14; p. 1163228
Main Authors:	Xing, Lijuan, Zhang, Lan, Zheng, Hongyan, Zhang, Zhuoxia, Luo, Yanzhong, Liu, Yuan, Wang, Lei
Format:	Journal Article
Language:	English
Published:	Switzerland Frontiers Media S.A 28-06-2023
Subjects:	auxin maize (Zea mays. L) mir169 NF-YA Plant Science salt tolerance salt tolerance maize (Zea mays. L) mir169 auxin NF-YA
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Summary:	In response to salt stress, plants alter the expression of manifold gene networks, enabling them to survive and thrive in the face of adversity. As a result, the growth and development of plant roots could be drastically altered, with significant inhibition of the growth of root meristematic zones. Although it is known that root growth is primarily regulated by auxins and cytokinins, the molecular regulatory mechanism by which salt stress stunts root meristems remains obscure. In this study, we found that the ZmmiR169q/ZmNF-YA8 module regulates the growth of maize taproots in response to salt stress. Salt stress downregulates ZmmiR169q expression, allowing for significant upregulation of ZmNF-YA8, which, in turn, activates ZmERF1B, triggering the upregulation of ASA1 and ASA2, two rate-limiting enzymes in the biosynthesis of tryptophan (Trp), leading to the accumulation of auxin in the root tip, thereby inhibiting root growth. The development of the maize root is stymied as meristem cell division and meristematic zone expansion are both stifled. This study reveals the ZmmiR169q/ZmNF-YA8 module's involvement in maintaining an equilibrium in bestowing plant salt tolerance and root growth and development under salt stress, providing new insights into the molecular mechanism underlying the homeostatic regulation of plant development in response to salt stress.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Reviewed by: Runlai Hang, University of California, Riverside, United States; Muhammad Sohail Akram, Government College University, Faisalabad, Pakistan Edited by: Vijay Gahlaut, Chandigarh University, India
ISSN:	1664-462X 1664-462X
DOI:	10.3389/fpls.2023.1163228