大豆GmMYB59d的生物信息学分析及其对低钾胁迫的响应
- Title:
- Bioinformatics Analysis of GmMYB59d and Its Response to Low Potassium Stress
- 摘要:
- 低钾胁迫会严重威胁大豆的产量与品质。在模式植物拟南芥中，转录因子AtMYB59已被证实参与调控植物对低钾胁迫的响应。大豆转录组测序结果显示，在低钾胁迫条件下，耐低钾品种与低钾敏感品种之间，其同源基因GmMYB59d的表达存在显著差异。为深入探讨GmMYB59d在低钾耐受中的潜在作用，本研究通过氨基酸序列比对、系统进化树构建、蛋白质保守结构域预测、组织表达模式分析以及基因克隆等方法，系统解析了该基因的基本特征，并进一步预测其在大豆应对低钾胁迫中的功能。结果显示：GmMYB59d是AtMYB59的直系同源基因，而GmMYB59a、GmMYB59b和GmMYB59c为其旁系同源基因。蛋白质保守结构域分析表明，GmMYB59d存在5个剪接体，其中剪接体GmMYB59d.1和GmMYB59d.5的蛋白结构与AtMYB59相似，均具有完整的R2R3型DNA结合域。RT-qPCR组织表达分析显示，GmMYB59d在根中表达量最高，且在低钾胁迫早期即被显著诱导表达。此外，本研究成功克隆出GmMYB59d基因。结果表明，GmMYB59d可能作为一种典型的转录因子，在根中参与调控大豆对低钾胁迫的响应机制。本研究不仅为解析GmMYB59d在低钾胁迫应答中的分子机制提供了重要依据，也为大豆钾高效种质资源的创新与利用发掘了关键基因。
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