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. 2020 Sep;43(9):2272-2286.
doi: 10.1111/pce.13829. Epub 2020 Jul 23.

Functions and regulatory framework of ZmNST3 in maize under lodging and drought stress

Zhenzhen Ren  1 , Dongling Zhang  1 , Liru Cao  1 , Weiqiang Zhang  2 , Hongjian Zheng  2 , Zhixue Liu  1 , Shengbo Han  1 , Yahui Dong  1 , Fangfang Zhu  1 , Huafeng Liu  1 , Huihui Su  1 , Yanhui Chen  1 , Liancheng Wu  1 , Yingfang Zhu  3 , Lixia Ku  1
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Free article

Functions and regulatory framework of ZmNST3 in maize under lodging and drought stress

Zhenzhen Ren et al. Plant Cell Environ. 2020 Sep.
Free article

Abstract

The growth and development of maize are negatively affected by various abiotic stresses including drought, high salinity, extreme temperature, and strong wind. Therefore, it is important to understand the molecular mechanisms underlying abiotic stress resistance in maize. In the present work, we identified that a novel NAC transcriptional factor, ZmNST3, enhances maize lodging resistance and drought stress tolerance. ChIP-Seq and expression of target genes analysis showed that ZmNST3 could directly regulate the expression of genes related to cell wall biosynthesis which could subsequently enhance lodging resistance. Furthermore, we also demonstrated that ZmNST3 affected the expression of genes related to the synthesis of antioxidant enzyme secondary metabolites that could enhance drought resistance. More importantly, we are the first to report that ZmNST3 directly binds to the promoters of CESA5 and Dynamin-Related Proteins2A (DRP2A) and activates the expression of genes related to secondary cell wall cellulose biosynthesis. Additionally, we revealed that ZmNST3 directly binds to the promoters of GST/GlnRS and activates genes which could enhance the production of antioxidant enzymes in vivo. Overall, our work contributes to a comprehensive understanding of the regulatory network of ZmNST3 in regulating maize lodging and drought stress resistance.

Keywords: ZmNST3; abiotic stress; maize; regulatory mechanism.

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