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以‘潍科3号’西瓜品种为试材,在日光温室环境下采用叶面喷施法,研究了不同浓度光合菌对低温逆境下西瓜幼苗叶片光合功能及抗氧化系统的影响。结果表明:西瓜苗期叶面喷施光合菌1×109~4×109 CFU/mL,明显减轻了低温胁迫下叶绿素的分解,有效缓解了低温对光合系统及抗氧化系统的伤害,保护了幼苗的膜系统,增强了西瓜幼苗对低温逆境的适应能力,其最适宜的浓度为4×109 CFU/mL。但叶面喷施8.0×109 CFU/mL光合菌却对西瓜幼苗有一定毒害作用。
The watermelon variety Weicong 3 was used as test material to study the effects of different concentrations of photosynthetic bacteria on the photosynthetic function and antioxidant system of watermelon seedling leaves under the condition of sunlight greenhouse. The results showed that 1 × 109 ~ 4 × 109 CFU / mL of photosynthetic bacteria was sprayed on the foliage of watermelon at seedling stage, which significantly reduced the chlorophyll decomposition under low temperature stress and effectively alleviated the damage of photosynthesis and antioxidant system at low temperature, Membrane system to enhance the adaptability of watermelon seedlings to low temperature stress, the most suitable concentration of 4 × 109 CFU / mL. However, foliar application of 8.0 × 109 CFU / mL photosynthetic bacteria on the watermelon seedlings have some toxic effects.