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.

 通讯作者 

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

Journal: New Phytologist

Published online: Dec 23, 2020