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Hosahalli Somasundara Rudresh¹, Neeragunda Shivaraj Yathisha¹, Sakrepatna Lakshminarayana Vaishnavi¹

¹Department of Studies and Research in Biotechnology and Microbiology, Tumkur University, Tumkur, Karnataka 572102 India.

Physiology and molecular biology of plants : an international journal of functional plant biology

|October 20, 2025

概括

Selaginella repanda表现出显著的干燥耐受性,在水损失和再水过程中表现出显著的生理和生化变化. 这种植物可以作为研究 Selaginella 种类干燥耐受性的模型.

科学领域:

植物生理学植物生理学
生物化学生物化学
分子生物学分子生物学

背景情况:

耐干燥对植物在干旱环境中的生存至关重要.
Selaginella 种类以其承受极度脱水的能力而闻名.

研究的目的:

调查Selaginella repanda*的干燥耐受性背后的生理和生化机制.
确定关键的分子标记与水损失和补水阶段相关.

主要方法:

对水合,干燥和再水合阶段的比较分析.
测量相对含水量,叶子水潜力和气体交换.
生物化学测定叶绿素,胡卜素,素,素,脂质过氧化和糖.
酶活性测定超氧化物脱酶,催化酶和过氧化酶.
扫描电子显微镜用于细胞和口腔修饰.
rbcl基因条形码用于物种识别.

主要成果:

在干燥阶段,相对水含量下降到8.3%,在再水后恢复到96.8%.
在干燥和再水过程中,观察到口腔和细胞结构的显著变化.
叶绿素和胡卜素水平下降,而素,素和脂质过氧化在干燥过程中增加.
抗氧化酶活性 (超氧化物脱氧化酶,催化酶,过氧化酶) 和糖度显著增加.
在干燥过程中,二氧化碳的交换率变为负值,表明光合作用停止.
生物化学参数恢复到与补水后的水合阶段类似的水平.

结论:

*Selaginella repanda* 具有构成性和可诱导性修复机制,用于耐干燥.
这项研究强调了生理和生化适应的复杂相互作用,使得在极端水损失的情况下生存.
*S. repanda* 作为一种有价值的模型生物,用于进一步研究 Selaginella. 的干燥耐受机制.

关键词:

抗氧化酶酶是一种抗氧化酶.相对含水量相对含水量.粉和糖糖的使用.总的叶绿素总量

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