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首页> 外文期刊>Environmental and experimental botany >Effects of high salinity irrigation on growth, gas-exchange, and photoprotection in date palms (Phoenix dactylifera L., cv. Medjool)
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Effects of high salinity irrigation on growth, gas-exchange, and photoprotection in date palms (Phoenix dactylifera L., cv. Medjool)

机译：高盐灌溉对枣椰子生长，气体交换和光保护的影响（Phoenix dactylifera L.，cv。Medjool）

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Date palms are widely cultivated in arid Mediterranean regions and require large quantities of water to produce commercial fruit yields. In these regions the plantations are commonly irrigated with low-quality water, which results in reduced growth and yields. To study the effect of using saline water for irrigation, date palm seedlings (cv. Medjool) were subjected to long-term irrigation treatments with water containing between 2 and 105 mM NaCl. The effect of saline irrigation was determined according to leaf gas exchange, chlorophyll a fluorescence, growth parameters and the distribution of key minerals in different plant organs. High salinity decreased plant growth and increased Na+ accumulation in the roots and lower stem. However, Na+ ions were mostly excluded from the sensitive photosynthetic tissues of the leaf. Thus, the reduction in the CO2 assimilation rate was primarily attributed to a reduced stomatal conductance. Consistent with this finding, the photosynthetic response to variable intercellular CO2 concentrations (A/C-1, curves) revealed no permanent damage to the photosynthetic apparatus and implicated developed photoprotective mechanisms. Independent of salinity treatment, 80% of the energy absorbed by the leaf was directed to non-photochemical quenching, as presented in electron-equivalent units. Functioning at full capacity, the non-photochemical mechanism could not compensate for all the excess irradiance. Thus, of the remaining absorbed energy, a significant portion was directed to photochemical O-2 related processes, rather than CO2 prevented photoinhibition. The exclusion of toxic ions and O-2-dependent energy dissipation maintained photosynthetic efficiency and supported survival under salt stress
机译：枣树在地中海干旱地区广泛种植，需要大量水才能产生商业性的水果产量。在这些地区，人工林通常用劣质水灌溉，这会导致生长和产量下降。为了研究使用盐水进行灌溉的效果，对枣椰子幼苗（Cv。Medjool）进行了长期灌溉处理，使用的水为2至105 mM NaCl。根据叶片气体交换，叶绿素a荧光，生长参数以及不同植物器官中关键矿物质的分布来确定盐渍灌溉的效果。高盐度会降低植物的生长，并增加根部和下部茎中的Na +积累。然而，Na +离子大部分被排除在叶片的敏感光合组织之外。因此，CO2同化率的降低主要归因于气孔导度的降低。与此发现一致，对可变的细胞间CO 2浓度（A / C-1，曲线）的光合作用反应没有显示出对光合作用装置的永久性损害，并且暗示了已开发的光保护机制。与盐分处理无关，叶子吸收的80％的能量直接用于非光化学猝灭，如电子当量单位所示。满负荷运行时，非光化学机制无法补偿所有多余的辐照度。因此，在剩余的吸收能量中，很大一部分是与光化学O-2相关的过程有关，而不是由CO2阻止了光抑制作用。排除有毒离子和依赖O-2的能量消散可维持光合作用效率并支持盐胁迫下的生存

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