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采用人为控制土壤含水量的方法对欧李进行轻度和重度干旱的处理,测定叶片的气体交换和叶绿素荧光参数的日变化。结果表明,干旱胁迫下欧李叶片净光合速率、蒸腾速率、水分利用效率、气孔导度、PSII最大光化学效率、光化学量子效率显著下降,但胞间CO2浓度、非光化学猝灭系数以及叶黄素循脱环氧化状态(Z+0.5A)/(V+A+Z)和Z含量升高。两干旱处理植株的影响程度存在差异。这表明在长时间干旱条件下,欧李叶片光合作用的降低受到气孔与非气孔因素的双重影响,叶黄素循环的启动增加了胁迫条件下的热耗散能力以保护光合机构免受干旱胁迫的进一步伤害。
Man-made soil moisture control methods were used to deal with the light and severe drought of European plum. The daily variations of gas exchange and chlorophyll fluorescence parameters were measured. The results showed that the net photosynthetic rate, transpiration rate, water use efficiency, stomatal conductance, PSII maximum photochemical efficiency, and photochemical quantum efficiency of P. plumuleus decreased significantly under drought stress, but the intercellular CO2 concentration, non-photochemical quenching coefficient and lutein withdrawal The epoxidation state (Z + 0.5A) / (V + A + Z) and the Z content increased. There is a difference in the degree of impact between the two drought-treated plants. This indicates that under long-time drought conditions, the decrease of photosynthesis in the leaves of Euryaleae is influenced by both stomatal and non-stomatal factors, and the initiation of lutein cycling increases the heat dissipation capacity under stress to protect the photosynthetic machinery from drought stress Further injury.