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抑制一种辅酶流量输送物增强了大米适应温带息地的能力

Yanchun Cui¹, Lifang Huang¹, Peng Liu¹

¹Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China.

Nature communications

|May 2, 2025

概括

一个叫HAN2的基因有助于大米耐受寒冷. 它在温带气候的日本大米中的活性降低,由于反转移子的插入,增强了冷却耐受性,帮助适应较冷的气候.

科学领域:

植物遗传学植物遗传学
农作物科学农作物科学
分子生物学分子生物学

背景情况:

米 (Oryza sativa L.) 是来自热带/亚热带地区的重要主食作物.
在温带地区种植大米需要增强的冷却耐受性.
对于大米冷却耐受性的分子机制尚不清楚.

研究的目的:

确定在温带地区的日本大米中产生冷却耐受性的遗传因素.
阐明与HAN2定量特征位置相关的冷却耐受性的分子机制.
研究HAN2在米适应温带气候中的作用.

主要方法:

定量特征位置 (QTL) 分析以确定HAN2.
对HAN2 (OsABCB5) 的基因表达分析.
在冷却压力下对大米的表型评估.
在印加和温带日本亚种之间对HAN2等位基因的比较分析.

主要成果:

HAN2定量特征位置赋予温带日本大米的冷却耐受性.
HAN2编码了一个辅酶流量输送器 (OsABCB5),该输送器会负面调节冷却耐受性.
在HAN2的下游插入A Copia逆转移子,减少了其在温带日本大米中的表达,提高了冷却耐受性.
在印加大米中引入温带日本HAN2等位基因,改善了冷却耐受性.

结论:

HAN2在调节大米的冷却耐受性方面发挥着至关重要的作用,可能是通过辅酶信号传递.
在化米过程中的选择性压力,涉及引入逆转移素,导致温带日本大米的冷却耐受性提高.
温带日本的HAN2等位基因是一种有价值的遗传资源,可以在较冷的环境中提高大米产量稳定性.

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