光氧化应激导致氧利的积累可能会引发干旱引起的橄树的叶子脱落
Sabina Villadangos1,2, Carmen González1, Sergi Munné-Bosch1,2
1Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, Universitat de Barcelona, Barcelona, Spain.
Physiologia plantarum
|May 27, 2023
概括
橄树在干旱期间落叶以保护自己. 这种编程的叶子脱落涉及维生素E和斯蒙酸盐,氧化还原信号可能会触发该过程.
科学领域:
- 植物生理学 植物生理学
- 植物应激反应应激反应
- 生物化学 生物化学
背景情况:
- 橄树脱落叶子 (脱落) 作为对严重干旱的防御.
- 这种被编程的过程涉及 petiole 底部的一个专门的细胞层.
- 维生素E的抗氧化作用及其与斯蒙酸盐在应激反应中的相互作用是关键的兴趣领域.
研究的目的:
- 为了研究维生素E和斯蒙酸盐在干旱引起的橄树叶脱落信号传递中的作用.
- 为了确定在干旱压力下,叶子沿着叶子向脱落区域形成的斯蒙酸盐梯度.
- 探索氧化还原信号在脱离过程中的参与.
主要方法:
- 年轻的橄树受到21天的抽水.
- 从灌和水压树木 (附着和脱落的叶子) 取样从顶部到树枝的叶子部分.
- 测量包括光系统II的效率,叶绿素,维生素E,脂质过氧化,氧利平和植物激素 (贾斯摩诺伊尔-单氨酸,酸).
主要成果:
- 干旱压力降低了光系统II的效率,叶绿素和维生素E,增加了脂质过氧化和光氧化压力.
- 含有氧利平和植物激素的含量增加,如士-单氨酸和酸.
- 在受压力附着的叶子的树枝中,α-托科菲罗尔减少,而掉落的叶子在叶片叶片中显示出更高的氧化应激.
结论:
- 红氧信号,包括氧利平的积累,可能会启动干旱压力橄树的叶子脱落.
- 维生素E的减少和氧化应激增加使叶子处于脱落的状态.
- 机械应力很可能需要完成空调后的脱离过程.
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