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<p>The cell wall (CW) is a highly coordinated molecular network that performs essential functions in cells, any change in its composition would dynamically activate response to compensate and sustain their main functionality. Maize dirigent protein, ZmDRR206, was previously reported to regulate the biosynthesis of CW components during maize seedling growth and disease resistance. Here, we reported the dual role of ZmDRR206 in regulating both CW biosynthesis and photosynthesis. The significantly decreased net photosynthetic rate, the reduced contents of starch and hemicellulose, and the increased contents of the soluble sugar, cellulose and lignin were accompanied with upregulated <i>ZmDRR206</i> level in maize photosynthetic leaves. Besides the deregulated intrinsic CW composition, the leaf anatomical and cellular structure was altered; accompanied with the constitutively up-regulated genes related to CW organization/biogenesis, secondary metabolism, and defense response, all these might contribute to the altered development and the reduced photosynthetic capacity of <i>ZmDRR206-</i>overexpressing seedlings. <i>ZmDRR206</i> might coordinately regulate the CW synthesis, vascular cell development, and defense response during maize leaf development, and might be exploited for molecular breeding of maize varieties with balanced high photosynthetic capacity and strong resistance or tolerance to biotic and abiotic stresses.</p>

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The Influence of ZmDRR206 Regulated Cell Wall Biosynthesis on Photosynthesis in Maize Seedlings

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Yan Mingzhu,
  • He Yonghui,
  • Du Yan,
  • Liu Meng,
  • Ye Jianrong

摘要

The cell wall (CW) is a highly coordinated molecular network that performs essential functions in cells, any change in its composition would dynamically activate response to compensate and sustain their main functionality. Maize dirigent protein, ZmDRR206, was previously reported to regulate the biosynthesis of CW components during maize seedling growth and disease resistance. Here, we reported the dual role of ZmDRR206 in regulating both CW biosynthesis and photosynthesis. The significantly decreased net photosynthetic rate, the reduced contents of starch and hemicellulose, and the increased contents of the soluble sugar, cellulose and lignin were accompanied with upregulated ZmDRR206 level in maize photosynthetic leaves. Besides the deregulated intrinsic CW composition, the leaf anatomical and cellular structure was altered; accompanied with the constitutively up-regulated genes related to CW organization/biogenesis, secondary metabolism, and defense response, all these might contribute to the altered development and the reduced photosynthetic capacity of ZmDRR206-overexpressing seedlings. ZmDRR206 might coordinately regulate the CW synthesis, vascular cell development, and defense response during maize leaf development, and might be exploited for molecular breeding of maize varieties with balanced high photosynthetic capacity and strong resistance or tolerance to biotic and abiotic stresses.