数字农科院2.0

Natural allelic variation of NAC transcription factor 22 regulates starch biosynthesis and properties in sweetpotato

文献类型： 外文期刊

作者： Yue Fan; Luyao Xue; Meiqi Shang; Shaopei Gao; Ning Zhao; Hong Zhai; Shaozhen He; Huan Zhang; Qingchang Liu

关键词： amylose; IbNAC22; IbNF‐YA10; starch accumulation; starch properties; sweetpotato

期刊名称： Journal of Integrative Plant Biology

ISSN： 1672-9072

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 科技核心（2024版）

摘要： sweetpotato varieties in China. IbNAC22 is highly expressed in storage roots and starch‐rich sweetpotato accessions. Overexpression of IbNAC22 significantly improved starch and amylose contents, as well as granule size and gelatinization temperature, and decreased starch crystallinity, whereas IbNAC22 knockdown had the opposite effects. IbNAC22 directly activates the expression of IbGBSSI, a key gene for amylose biosynthesis, but suppresses the expression of IbSBEI, a key gene for amylopectin biosynthesis. IbNAC22 directly interacts with IbNFYA10. Overexpressing of IbNF‐YA10 significantly improved starch and amylose contents, and starch gelatinization temperature, but decreased granule size, crystallinity, and amylopectin chain length distribution. IbNF‐YA10 directly activates IbAGPL and IbGBSSI, which are key genes involved in starch and amylose biosynthesis. IbNAC22–IbNF‐YA10 heterodimers further enhance the IbNF‐YA10‐induced activation of IbAGPL and IbGBSSI. These findings increase our understanding of starch biosynthesis and starch properties and provide strategies and candidate genes for the improvement of starchy root and tuber crops.

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