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<p>Aroma is a key determinant of rice quality and consumer acceptance. This study reports the identification of an aromatic rice cultivar, PSXN, characterized by high accumulation of 2-acetyl-1-pyrroline (2-AP) and γ-aminobutyric acid (GABA) alongside a fully functional <i>badh2</i> gene. The novel aroma gene <i>aro</i> was successfully mapped to a 201.1&#xa0;kb interval on chromosome 8 through a combination of gene chip technology and SSR marker analysis. Subsequent comprehensive functional annotation, ontology analysis, and expression profiling indicated <i>Os08g0431100</i>, <i>Os08g0430800</i>, and <i>Os08g0430300</i> as the most promising candidate genes for <i>aro</i>. Notably, comparative metabolic pathway analyses displayed no significant differences in most key aroma-related compounds and enzymatic activities between <i>aro</i>-containing cultivars and non-aromatic controls, suggesting the existence of an alternative 2-AP biosynthetic pathway independent of the classical <i>badh2</i> mechanism. This study expands our understanding of rice aromatic genetics and opens new avenues for rice quality improvement.</p>

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Genetic analysis and localization of aroma candidate genes for rice

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Junjun Guo,
  • Xueyu Yang,
  • Liang Gao,
  • Jin Chen,
  • Liang Zhang,
  • Chunlong Zhang,
  • Bo Zhang,
  • Chuyi Wang,
  • Dandan Li,
  • Juan Li,
  • Shihuang Pu,
  • Jiangli Zhang,
  • Jiancheng Wen

摘要

Aroma is a key determinant of rice quality and consumer acceptance. This study reports the identification of an aromatic rice cultivar, PSXN, characterized by high accumulation of 2-acetyl-1-pyrroline (2-AP) and γ-aminobutyric acid (GABA) alongside a fully functional badh2 gene. The novel aroma gene aro was successfully mapped to a 201.1 kb interval on chromosome 8 through a combination of gene chip technology and SSR marker analysis. Subsequent comprehensive functional annotation, ontology analysis, and expression profiling indicated Os08g0431100, Os08g0430800, and Os08g0430300 as the most promising candidate genes for aro. Notably, comparative metabolic pathway analyses displayed no significant differences in most key aroma-related compounds and enzymatic activities between aro-containing cultivars and non-aromatic controls, suggesting the existence of an alternative 2-AP biosynthetic pathway independent of the classical badh2 mechanism. This study expands our understanding of rice aromatic genetics and opens new avenues for rice quality improvement.