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New Phytologist:枣椰树对于海水和涝害的生理响应

已有 524 次阅读 2020-12-26 08:56 |个人分类:每日摘要|系统分类:论文交流

Physiological responses of date palm (Phoenix dactylifera) seedlings to seawater and flooding

第一作者Baoguo Du

第一单位绵阳师范学院

通讯作者Baoguo Du


 Abstract 


背景回顾In their natural environment along coast lines, date palms are exposed to seawater inundation and, hence, combined stress by salinity and flooding.


主要研究:To elucidate the consequences of this combined stress on foliar gas exchange and metabolite abundances in leaves and roots, date palm seedlings were exposed to flooding with seawater and its major constituents under controlled conditions.


结果1-海水处理Seawater flooding significantly reduced CO2 assimilation, transpiration and stomatal conductance, but did not affect isoprene emission. 


结果2-NaCl处理:A similar effect was observed upon NaCl exposure.


结果3-蒸馏水或硫酸镁处理:By contrast, flooding with distilled water or MgSO4 did not affect CO2/H2O gas exchange or stomatal conductance significantly, indicating that neither flooding itself, nor seawater sulfate, contributed greatly to stomatal closure. 


结果4-海水影响:Seawater exposure increased Na and Cl contents in leaves and roots, but did not affect sulfate contents significantly. Metabolite analyses revealed reduced abundances of foliar compatible solutes, such as sugars and sugar alcohols, whereas nitrogen compounds accumulated in roots.


结果5-减少蒸腾的作用Reduced transpiration upon seawater exposure may contribute to controlling the movement of toxic ions to leaves and, therefore, can be seen as a mechanism to cope with salinity.


结论:The present results indicate that date palm seedlings are tolerant towards seawater exposure to some extent, and highly tolerant to flooding.


 摘  要 


在沿海岸线附近的自然环境中,枣椰树会遭受海水的淹没,从而受到盐和水淹的双重胁迫。为了阐明这种复合胁迫对叶片气体交换以及叶片和根部代谢产物的影响,作者利用枣椰树的幼苗,采取海水浸泡或者含海水主要成分,但是可控的情况下进行处理。海水处理显著降低了CO2同化、蒸腾和气孔导度,但不影响异戊二烯的排放。用NaCl处理也有类似的结果。相反,利用蒸馏水或者硫酸镁处理,则对CO2/H2O气体交换或气孔导度没有显著影响,说明淹水本身或者和海水的硫酸盐并不是气孔关闭的主要原因。海水处理会增加叶片和根系中的Na和Cl含量,但对硫酸盐含量的影响不显著。代谢物分析显示,叶片相容溶质,如糖和糖醇的含量有所降低,而氮化合物在根中有积累。海水处理后,蒸腾作用的减少可能有助于控制有毒离子向叶片的移动,因此,可以被视作一种植物应对盐胁迫的机制。这些研究结果表明,枣椰树幼苗对海水有一定的耐受性,对淹水则有较强的耐受性。


 通讯作者 

**杜保国**


个人简介:

1998-2002年,西北农林科技大学,学士;

2002-2005年,西北农林科技大学,硕士;

2012-2015年,弗莱堡大学,博士;

2015-2018年,弗莱堡大学,博后;

2019年-至今,弗莱堡大学,博后。


研究方向:

1. 综合运用组学技术,研究气候变化背景下植物对生物和非生物胁迫的响应机制;

2. 植物挥发性有机化合物(VOC)生物和非生物胁迫的响应;

3. 受损生态系统的植物修复(Phytoremediation);

4. 经济林良种选育及丰产栽培技术;

5. 人工林栽培以及混交效应的生理生态机理。


doi: https://doi.org/10.1111/nph.17123


Journal: New Phytologist

Published online: Dec 23, 2020



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