Shoot hydraulic impairments induced by root waterlogging: Parallels and contrasts with drought.

IF 6.5 1区 生物学 Q1 PLANT SCIENCES
Eduardo J Haverroth, Cristiane J Da-Silva, Matthew Taggart, Leonardo A Oliveira, Amanda A Cardoso
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Abstract

Soil waterlogging and drought correspond to contrasting water extremes resulting in plant dehydration. Dehydration in response to waterlogging occurs due to impairments to root water transport, but no previous study has addressed whether limitations to water transport occur beyond this organ or whether dehydration alone can explain shoot impairments. Using common bean (Phaseolus vulgaris) as a model species, we report that waterlogging also impairs water transport in leaves and stems. During the very first hours of waterlogging, leaves transiently dehydrated to water potentials close to the turgor loss point, possibly driving rapid stomatal closure and partially explaining the decline in leaf hydraulic conductance. The initial decline in leaf hydraulic conductance (occurring within 24 h), however, surpassed the levels predicted to occur based solely on dehydration. Constraints to leaf water transport resulted in a hydraulic disconnection between leaves and stems, furthering leaf dehydration during waterlogging and after soil drainage. As leaves dehydrated later during waterlogging, leaf embolism initiated and extensive embolism levels amplified leaf damage. The hydraulic disconnection between leaves and stems prevented stem water potentials from declining below the threshold for critical embolism levels in response to waterlogging. This allowed plants to survive waterlogging and soil drainage. In summary, leaf and stem dehydration are central in defining plant impairments in response to waterlogging, thus creating similarities between waterlogging and drought. Yet, our findings point to the existence of additional players (likely chemicals) partially controlling the early declines in leaf hydraulic conductance and contributing to leaf damage during waterlogging.

根部积水引起的嫩枝水力损伤:与干旱的相似之处和对比。
土壤涝害和干旱对应着截然不同的极端水量,导致植物脱水。根部水分运输受阻会导致涝害引起的脱水,但之前的研究并未探讨水分运输受限是否发生在根部以外的器官,也未探讨是否仅脱水就能解释嫩枝受阻的原因。我们以蚕豆(Phaseolus vulgaris)为模式物种,报告了涝害也会损害叶片和茎的水分运输。在发生涝害的最初几个小时,叶片瞬时脱水到接近凝结力损失点的水势,这可能促使气孔迅速关闭,并部分解释了叶片水力传导下降的原因。然而,叶片水导的最初下降(发生在 24 小时内)超过了仅根据脱水情况预测的水平。叶片水分运输受限导致叶片和茎之间的水力断开,进一步加剧了涝害期间和土壤排水后的叶片脱水。由于叶片在涝害期间脱水较晚,叶片开始栓塞,广泛的栓塞程度扩大了叶片的损害。叶片和茎之间的水力断裂阻止了茎的水势在涝害时下降到临界栓塞水平的阈值以下。这使得植物能够在涝害和土壤排水中存活下来。总之,叶片和茎干脱水是植物在涝害中受损的主要原因,因此造成了涝害和干旱之间的相似性。然而,我们的研究结果表明,还有其他因素(可能是化学物质)在部分程度上控制着叶片水导的早期下降,并导致了涝害期间的叶片损伤。
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来源期刊
Plant Physiology
Plant Physiology 生物-植物科学
CiteScore
12.20
自引率
5.40%
发文量
535
审稿时长
2.3 months
期刊介绍: Plant Physiology® is a distinguished and highly respected journal with a rich history dating back to its establishment in 1926. It stands as a leading international publication in the field of plant biology, covering a comprehensive range of topics from the molecular and structural aspects of plant life to systems biology and ecophysiology. Recognized as the most highly cited journal in plant sciences, Plant Physiology® is a testament to its commitment to excellence and the dissemination of groundbreaking research. As the official publication of the American Society of Plant Biologists, Plant Physiology® upholds rigorous peer-review standards, ensuring that the scientific community receives the highest quality research. The journal releases 12 issues annually, providing a steady stream of new findings and insights to its readership.
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