International Journal of Molecular Sciences (Apr 2024)

<i>ZmNAC17</i> Regulates Mesocotyl Elongation by Mediating Auxin and ROS Biosynthetic Pathways in Maize

  • Ran Yang,
  • Kangshi Li,
  • Ming Wang,
  • Meng Sun,
  • Qiuhua Li,
  • Liping Chen,
  • Feng Xiao,
  • Zhenlong Zhang,
  • Haiyan Zhang,
  • Fuchao Jiao,
  • Jingtang Chen

DOI
https://doi.org/10.3390/ijms25094585
Journal volume & issue
Vol. 25, no. 9
p. 4585

Abstract

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The mesocotyl is of great significance in seedling emergence and in responding to biotic and abiotic stress in maize. The NAM, ATAF, and CUC2 (NAC) transcription factor family plays an important role in maize growth and development; however, its function in the elongation of the maize mesocotyl is still unclear. In this study, we found that the mesocotyl length in zmnac17 loss-of-function mutants was lower than that in the B73 wild type. By using transcriptomic sequencing technology, we identified 444 differentially expressed genes (DEGs) between zmnac17-1 and B73, which were mainly enriched in the “tryptophan metabolism” and “antioxidant activity” pathways. Compared with the control, the zmnac17-1 mutants exhibited a decrease in the content of indole acetic acid (IAA) and an increase in the content of reactive oxygen species (ROS). Our results provide preliminary evidence that ZmNAC17 regulates the elongation of the maize mesocotyl.

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