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Background <p>Grain size is a critical factor that affects yield in wheat (<i>Triticum aestivum</i>). CRINKLY4 (CR4) receptor-like kinase regulates epidermal cell differentiation and seed development in several plant species, yet its functional role in wheat remains to be clarified.</p> Results <p>In this study, we identified the <i>TaCR4</i> gene, which encodes the CRINKLY4 receptor-like kinase homolog in wheat. We created overexpressing (OE) wheat lines with increased <i>TaCR4-A</i> expression and found that the grain length, width, thickness, and weight of the OE lines increased. Cytological analysis revealed that the overexpression of <i>TaCR4-A</i> increased the length, width, and area of wheat grain outer pericarp cells.</p> Conclusions <p>This study demonstrated that <i>TaCR4</i> positively regulates wheat grain size by regulating the size of grain epidermal cells.</p>

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Overexpression of TaCR4-A positively regulates grain size in Triticum aestivum

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月1日

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  • Qian Qian,
  • Weiguo Hu,
  • Yang Yu,
  • Yang Liu,
  • Yesong Tian,
  • Xiaohong Zhang,
  • Donghong Min

摘要

Background

Grain size is a critical factor that affects yield in wheat (Triticum aestivum). CRINKLY4 (CR4) receptor-like kinase regulates epidermal cell differentiation and seed development in several plant species, yet its functional role in wheat remains to be clarified.

Results

In this study, we identified the TaCR4 gene, which encodes the CRINKLY4 receptor-like kinase homolog in wheat. We created overexpressing (OE) wheat lines with increased TaCR4-A expression and found that the grain length, width, thickness, and weight of the OE lines increased. Cytological analysis revealed that the overexpression of TaCR4-A increased the length, width, and area of wheat grain outer pericarp cells.

Conclusions

This study demonstrated that TaCR4 positively regulates wheat grain size by regulating the size of grain epidermal cells.