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采用营养液水培方法,研究了低氧胁迫下外源γ-氨基丁酸(GABA)对甜瓜幼苗光合色素含量、光合作用及叶绿素荧光参数的影响.结果表明:低氧胁迫导致甜瓜幼苗光合色素含量显著下降,光合作用降低;外源GABA能显著提高正常通气和低氧胁迫下甜瓜幼苗的光合色素含量、净光合速率、气孔导度、胞间CO2浓度、CO2羧化效率、最大光化学效率、光化学猝灭系数、表观光合电子传递速率和PSⅡ光合电子传递量子效率,而气孔限制值、初始荧光和非光化学猝灭系数显著降低,GABA在低氧胁迫下的提高效果更明显;同时添加GABA和GABA转氨酶抑制剂γ-乙烯基-γ-氨基丁酸(VGB)处理显著降低了低氧胁迫下GABA对甜瓜幼苗光合特性的缓解效果.
The effects of exogenous γ-aminobutyric acid (GABA) on photosynthetic pigment content, photosynthesis and chlorophyll fluorescence parameters of muskmelon seedlings under hypoxia stress were studied using hydroponic hydroponic methods. The results showed that hypoxia stress caused photosynthetic pigments Content of photosynthesis decreased significantly; exogenous GABA could significantly increase photosynthetic pigment content, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, CO2 carboxylation efficiency, maximum photochemical efficiency, Photochemical quenching coefficient, photosynthetic electron transfer rate and quantum efficiency of photosynthetic electron transfer of PSⅡ, while stomatal limitation value, initial fluorescence and non-photochemical quenching coefficient were significantly decreased, and GABA increased more under hypoxia stress. At the same time, GABA And GABA aminotransferase inhibitor γ-vinyl-γ-aminobutyric acid (VGB) significantly reduced the alleviating effect of GABA on the photosynthetic characteristics of melon seedlings under hypoxia stress.