生物
背景(考古学)
叶黄素
脱落酸
干旱胁迫
植物
濒危物种
光防护
栖息地
生态学
园艺
光合作用
生物化学
基因
古生物学
作者
Alba Cotado,Sergi Munné‐Bosch,Marta Pintó‐Marijuan
摘要
In the context of future climate change new habitats will be threatened and unique species will be forced to develop different strategies to survive. Saxifraga longifolia Lapeyr. is an endemic species from the Pyrenees with a very particular habitat. We explored the capacity and strategies of S. longifolia plants to face different severities of drought stress under both natural conditions and controlled water stress followed by a re‐watering period of 20 days. Our results showed a role for abscisic acid (ABA), salicylic acid (SA) and cytokinins (CKs) in plant survival from drought stress, and as the stress increased, ABA lost significance and SA appeared to be more associated with the response mechanisms. Moreover, photo‐oxidative stress markers revealed that both xanthophyll cycles played a photoprotection role with a stronger participation of the lutein epoxide cycle as the stress was more intense. Severe drought decreased the maximum efficiency of photosystem II (F v /F m ) below 0.45, being this the limit to survive upon rewatering. Overall, our results proved different strategies of S. longifolia plants to cope with drought stress and suggested a F v /F m threshold to predict plant survival in high‐mountain environments.
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