H2O2和NO对线粒体功能和冷藏桃子果的氧化mtDNA损伤的相互作用作用
Yiming Jiang1, Chen Chen1, Dandan Huang1
1College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, PR China.
概括
过氧化 (H2O2) 会加剧线粒体损伤并损害冷藏桃子的功能. 氧化 (NO) 抵消了这些影响,突出了植物应激反应中的复杂信号.
科学领域:
- 植物生理学 植物生理学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 过氧化 (H2O2) 和氧化 (NO) 是植物中至关重要的信号分子,影响生理和压力反应.
- 已知氧化 (NO) 可以保护线粒体免受氧化损伤,特别是在寒冷压力下.
- 了解H2O2和NO之间的相互作用对于管理植物压力和保持水果质量至关重要.
研究的目的:
- 研究H2O2对冷藏桃子中的线粒体功能和线粒体DNA (mtDNA) 损伤的影响.
- 阐明H2O2和NO对这些过程的相互作用作用.
- 探索N-乙囊 (NAC) 在减轻H2O2诱导损伤中的作用.
主要方法:
- 冷藏的桃子被用化 (SNP) 作为NO捐赠剂处理,然后进行H2O2处理.
- 测量了活性氧物种 (ROS) 含量,mtDNA损伤标志物 (8-基瓜诺辛,AP位点) 和BER通路酶活性.
- 评估了线粒体功能参数,包括线粒体透性过渡孔口,氧气消耗,呼吸控制比率和膜潜力.
- 评估了NAC的作用,一个ROS清理器,对BER通路的基因表达.
主要成果:
- H2O2治疗显著增加了ROS水平,mtDNA损伤标志物 (8-OHdG,AP位点),并降低了BER通路酶和超氧化物转化酶 (SOD) 的活性.
- 通过增加孔隙开放,加剧氧气消耗,减少呼吸控制比率和膜潜力,H2O2损害了线粒体功能.
- 与NO结合使用NAC,显著提高了BER通路基因表达的调节.
- 在冷藏的桃子中,H2O2处理抵消了NO对线粒体的保护作用.
结论:
- 在冷藏的桃子中,H2O2加剧了线粒体功能障碍和mtDNA损伤,抵消了NO的保护作用.
- NO,可能由NAC增强,通过上调基切除修复 (BER) 路径来起保护作用.
- 这项研究揭示了H2O2和NO在调节植物对寒冷压力的线粒体反应中的复杂交叉声.
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