黑色素诱导的耐受性需要玉米中的硫化信号
Xiaoxiao Yang1,2, Qifeng Shi3, Xinru Wang3
1College of Life Sciences, Shanxi Agricultural University, Jinzhong 030800, China.
Plants (Basel, Switzerland)
|July 13, 2024
概括
黑素通过增加硫化 (H2S) 的产生来提高玉米中的耐受性,而H2S作为一个关键的下游信号. 这种相互作用涉及细胞壁代谢和抗氧化活性的变化.
科学领域:
- 植物生理学 植物生理学
- 环境毒理学环境毒理学
- 生物化学 生物化学
背景情况:
- 众所周知,氨酸和硫化 (H2S) 降低了植物中的 (Cr) 毒性.
- 在Cr排毒途径中,黑激素和H2S之间的精确相互作用尚未完全理解.
研究的目的:
- 为了研究氨酸和H2S在减轻玉米中毒性的相互作用.
- 通过检查细胞壁多糖代谢和抗氧化酶活性,阐明这些分子在Cr排毒中的作用.
主要方法:
- 玉米植物受到应力 (100μM K2Cr2O7) 的影响.
- 分析了L-/D-氨酸脱硫酶 (LCD/DCD) 和氨酸-N-乙转移酶 (SNAT) 的基因表达.
- 测量了内源的H2S和黑激素水平.
- 评估了细胞壁中的多糖含量,pectin甲基化酶活性和抗氧化酶活性.
- 评估了H2S清理和黑激素合成抑制 (p-甲氨酸) 的影响.
主要成果:
- 压力通过上调LCD/DCD基因表达来增加内源H2S水平.
- 黑色素治疗显著增加了H2S的产生,并提高了CR的耐受性.
- NaHS (一种H2S来源) 对黑激素合成的影响很小.
- 黑色素诱导的Cr耐受性与增加的H2S,改善细胞壁多糖代谢和增强的抗氧化活性有关.
- H2S清理降低了黑色素诱导的Cr耐受性,而抑制黑色素合成对H2S诱导的耐受性几乎没有影响.
结论:
- 硫化 (H2S) 作为一种下游信号分子,在玉米中黑激素诱导的耐受性路径中起作用.
- 黑色素对Cr毒性的保护作用,部分是通过其刺激H2S生产的能力来调解的.
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