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在三种具有不同根系和承受应激能力的木质种群中,对多次连续的非生物压力 (水浸-干旱) 的功能性反应

A S Quiñones Martorello^1,2, J E Gyenge^1,3, M N Colabelli²

¹LIA FORESTIA (INTA_INRAE), Buenos Aires, Argentina.

Physiologia plantarum

|June 20, 2023

概括

植物可以承受连续的浸水和干旱压力,这与预期相反. 以前的浸水暴露并没有增加干旱易感性,而是根据浸水持续时间诱导了耐受性.

科学领域:

植物生态生理学植物生态生理学
环境压力耐受性环境压力耐受性
植物适应战略植物适应战略

背景情况:

植物经常面临着连续的环境压力,如水浸和干旱.
干旱抵抗力和浸水之间通常存在一种权衡,使植物的生存复杂化.
了解植物对联合顺序应激的反应,对于预测生态系统弹性至关重要.

研究的目的:

评估Eucalyptus camaldulensis,Salix matsudana x Salix alba和Salix nigra的生态生理学策略,以测量它们对连续水浸和干旱 (W+D) 的影响.
为了确定先前的浸水暴露是否会影响植物对后续干旱压力的敏感性.
调查浸水时间对耐受性机制的影响.

主要方法:

三种植物分类被控制,仅干旱,短时间 (15天) 浸水 + 干旱,长时间 (30天) 浸水 + 干旱处理.
测量包括生物质分配,生长参数,叶子特征,水潜力,液压导电性和根形态.
根皮皮层空心和偶然根形成被评估为耐压力的指标.

主要成果:

树 (Eucalyptus camaldulensis) 在不影响生长的情况下对W+D表现出耐受性,开发了叶子和全植物策略.
Salix 克隆表现出差异性的反应; 根生物质在短时间的浸水中减少,但耐受性机制 (空气基因,偶然根) 在更长时间的浸水中出现.
与预期相反,先前的浸水暴露并没有增加干旱易感性;相反,它赋予了取决于浸水持续时间的耐受性.

结论:

连续的浸水和干旱压力可以诱导某些植物物种的耐受性,挑战传统的干旱与浸水抵抗性权衡.
浸水暴露的持续时间是决定植物应对后续干旱的能力的一个关键因素.
管理顺序应激的生态策略涉及根形态和生理反应的特定物种适应.

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