玉米的特征 (Zea mays) -Ustilago maydis在气候变暖中的相互作用
Christian G Schwarz1, Finn Hartmann1, Christopher Zier2
1Plant Cell Biology, Biochemistry, and Biotechnology, Biology and Preclinical Medicine, University of Regensburg, Regensburg, Germany.
Journal of experimental botany
|October 27, 2025
概括
气候变化通过改变Ustilago maydis感染影响玉米产量. 即使是最小的温度增加也会加剧疾病,而热浪会加速玉米污垢的发展,影响作物耐药性.
科学领域:
- 植物病理学 植物病理学
- 分子生物学分子生物学
- 气候变化研究 气候变化研究
背景情况:
- 玉米是全球重要的作物,受到Ustilago maydis (玉米污垢) 的威胁.
- 预计气候变化和气温上升将改变作物病原体相互作用,影响产量.
- 根据温度调节的玉米对U. maydis的敏感性背后的分子机制尚不清楚.
研究的目的:
- 研究最小温度变化对玉米U.maydis感染的影响.
- 为了阐明玉米温度依赖性易感性的分子基础.
- 识别导致抗性变化的宿主因素.
主要方法:
- 在多种玉米品种上进行了Ustilago maydis感染试验.
- RNA-sequencing (RNA-seq) 分析是在不同的温度模式下进行的.
- 使用表达-表现型相关性和体内试验来确定耐药性因子.
主要成果:
- 即使是最小的温度也会增加玉米的疾病症状.
- 一个短暂的热浪显著增加了瘤的形成和疾病的进展.
- 温度和品种显著改变了玉米的转录反应,GIBBERELLIC ACID STIMULATED TRANSCRIPT-LIKE 4 (GSL4) 被确定为广泛的耐药性因素.
- 降低易感性代谢物的γ-aminobutyric acid (GABA) 转氨酶的表达是温度和品种依赖的,并且与减少感染相关.
结论:
- 温度波动显著影响玉米对U. maydis的易感性,影响疾病的严重程度和发展.
- 主体转录反应在很大程度上受温度和品种的调节,揭示了关键的抵抗机制.
- GSL4和GABA转氨酶的调节是培育适应气候变化的玉米品种的重要目标.
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