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以两个变种甜瓜幼苗为材料,在人工控制条件下研究了NaCl胁迫对甜瓜叶片气体交换和叶绿素荧光特性的影响。结果表明,盐胁迫降低了甜瓜叶片光合色素含量、净光合速率、蒸腾速率、气孔导度和PSⅡ最大光化学效率、PSⅡ潜在活性、PSⅡ电子传递量子效率和光化学猝灭系数,使非光化学猝灭系数升高。在≤50 mmol.L-1NaCl胁迫下,甜瓜叶片光合速率降低主要由气孔因素引起,而在NaCl浓度≥100 mmol.L-1条件下则以非气孔限制因素为主。
Two varieties of melon seedlings were used as materials to study the effects of NaCl stress on gas exchange and chlorophyll fluorescence characteristics of melon leaves under artificial control conditions. The results showed that salt stress decreased photosynthetic pigment content, net photosynthetic rate, transpiration rate, stomatal conductance, maximum photochemical efficiency of PSⅡ, potential activity of PSⅡ, quantum efficiency of PSⅡ electron transfer and photochemical quenching, and the non-photochemical quenching coefficient Rise. Under the stress of ≤50 mmol.L-1NaCl, the decrease of photosynthetic rate of melon leaves was mainly caused by stomatal factors, while the non-stomatal limitation was the main factor under the condition of NaCl concentration> 100 mmol.L-1.