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The Potassium-Dependent Transcriptome Analysis of Maize Provides Novel Insights into the Rescue Role of Auxin in Responses to Potassium Deficiency

文献类型： 外文期刊

作者： Zhou, Dongying 1 ; Wang, Kai 1 ; Zhang, He 1 ; Du, Qi 1 ; Liu, Yingyan 1 ; Wang, Jing 1 ; Wang, Xiaoguang 1 ; Yu, Haiqiu 1 ; Zhao, Xinhua 1 ;

作者机构： 1.Shenyang Agr Univ, Coll Agron, Shenyang 110866, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Coastal Agr Inst, Tangshan 063299, Peoples R China

关键词： maize; potassium deficiency; auxin; root growth; transcriptome

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 6 期

页码：

收录情况： SCI

摘要： Potassium (K+) deficiency is a key factor limiting maize growth and yield. Auxin plays an important role in maize adaptation to K+ deficiency, but its physiological and molecular mechanisms are largely unclear. In this study, the exogenous application of 0.01 mu mol.L-1 alpha-Naphthalene acetic acid (NAA) could effectively alleviate the growth inhibition of maize roots caused by K+ deficiency, especially in the low-K-sensitive maize inbred line D937. The transcriptome results showed that 3924 and 5458 genes were differentially expressed by exogenous NAA in D937 (sensitive to K+ deficiency) and 90-21-3 (tolerant to K+ deficiency) under K+ deficiency, respectively. The exogenous application of NAA to D937 results in maintenance of the indole acetic acid (IAA) levels by inducing an upregulation in the expression of YUCCA-encoding genes and decreases abscisic acid (ABA) content by inducing the differential expression of genes encoding NCED (downregulated), ABA2 (downregulated), and PP2C (up regulated), thereby reducing growth damage caused by K+ deficiency. In 90-21-3, exogenous NAA can decrease ABA content and increase IAA/ABA by inducing the differential expression of CYP707- and ABF-related genes, inhibiting the excess accumulation of reactive oxygen species by inducing the differential expression of genes encoding antioxidant enzymes, and maintain cellular K+ homeostasis by regulating the expression of genes encoding K+ channels and transporters, thus enhancing plant tolerance to K+ deficiency. This study lays the foundation for understanding the molecular mechanisms underlying maize adaptation to K+ deficiency.

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