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Maize Dek407 Encodes the Nitrate Transporter 1.5 and Is Required for Kernel Development

文献类型： 外文期刊

作者： Wang, Hongqiu 1 ; Yan, Xiaolan 2 ; Du, Qingguo 1 ; Yan, Pengshuai 1 ; Xi, Jinjin 2 ; Meng, Xiaoruo 2 ; Li, Xuguang 2 ; Liu, Huijian 2 ; Liu, Guoqin 2 ; Fu, Zhongjun 4 ; Tang, Jihua 2 ; Li, Wen-Xue 1 ;

作者机构： 1.Chinese Acad Agr Sci, Natl Engn Lab Crop Mol Breeding, Inst Crop Sci, Beijing 100081, Peoples R China

2.Henan Agr Univ, Coll Agron, Natl Key Lab Wheat & Maize Crop Sci, Zhengzhou 450002, Peoples R China

3.Shennong Lab, Zhengzhou 450002, Peoples R China

4.Chongqing Acad Agr Sci, Chongqing 401329, Peoples R China

关键词： maize; defective kernel; IAA; kernel size; kernel weight; natural variation

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.6； 五年影响因子：6.2 ）

ISSN： 1661-6596

年卷期： 2023 年 24 卷 24 期

页码：

收录情况： SCI

摘要： The kernel serves as the storage organ and harvestable component of maize, and it plays a crucial role in determining crop yield and quality. Understanding the molecular and genetic mechanisms of kernel development is of considerable importance for maize production. In this study, we obtained a mutant, which we designated defective kernel 407 (dek407), through ethyl methanesulfonate mutagenesis. The dek407 mutant exhibited reduced kernel size and kernel weight, as well as delayed grain filling compared with those of the wild type. Positional cloning and an allelism test revealed that Dek407 encodes a nitrate transporter 1/peptide transporter family (NPF) protein and is the allele of miniature 2 (mn2) that was responsible for a poorly filled defective kernel phenotype. A transcriptome analysis of the developing kernels showed that the mutation of Dek407 altered the expression of phytohormone-related genes, especially those genes associated with indole-3-acetic acid synthesis and signaling. Phytohormone measurements and analysis indicated that the endogenous indole-3-acetic acid content was significantly reduced by 66% in the dek407 kernels, which may be the primary cause of the defective phenotype. We further demonstrated that natural variation in Dek407 is associated with kernel weight and kernel size. Therefore, Dek407 is a potential target gene for improvement of maize yield.

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