Frontiers in Genetics (Oct 2021)

Nucleotide Diversity of the Maize ZmCNR13 Gene and Association With Ear Traits

  • Zhihao Zuo,
  • Zhihao Zuo,
  • Zhihao Zuo,
  • Yue Lu,
  • Yue Lu,
  • Yue Lu,
  • Minyan Zhu,
  • Minyan Zhu,
  • Minyan Zhu,
  • Rujia Chen,
  • Rujia Chen,
  • Rujia Chen,
  • Enying Zhang,
  • Derong Hao,
  • Qianfeng Huang,
  • Qianfeng Huang,
  • Hanyao Wang,
  • Yanze Su,
  • Zhichao Wang,
  • Yang Xu,
  • Yang Xu,
  • Yang Xu,
  • Pengcheng Li,
  • Pengcheng Li,
  • Pengcheng Li,
  • Chenwu Xu,
  • Chenwu Xu,
  • Chenwu Xu,
  • Zefeng Yang,
  • Zefeng Yang,
  • Zefeng Yang

DOI
https://doi.org/10.3389/fgene.2021.773597
Journal volume & issue
Vol. 12

Abstract

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The maize (Zea mays L.) ZmCNR13 gene, encoding a protein of fw2.2-like (FWL) family, has been demonstrated to be involved in cell division, expansion, and differentiation. In the present study, the genomic sequences of the ZmCNR13 locus were re-sequenced in 224 inbred lines, 56 landraces and 30 teosintes, and the nucleotide polymorphism and selection signature were estimated. A total of 501 variants, including 415 SNPs and 86 Indels, were detected. Among them, 51 SNPs and 4 Indels were located in the coding regions. Although neutrality tests revealed that this locus had escaped from artificial selection during the process of maize domestication, the population of inbred lines possesses lower nucleotide diversity and decay of linkage disequilibrium. To estimate the association between sequence variants of ZmCNR13 and maize ear characteristics, a total of ten ear-related traits were obtained from the selected inbred lines. Four variants were found to be significantly associated with six ear-related traits. Among them, SNP2305, a non-synonymous mutation in exon 2, was found to be associated with ear weight, ear grain weight, ear diameter and ear row number, and explained 4.59, 4.61, 4.31, and 8.42% of the phenotypic variations, respectively. These results revealed that natural variations of ZmCNR13 might be involved in ear development and can be used in genetic improvement of maize ear-related traits.

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