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以一串红、大10、红果2号3个果桑品种的3年生嫁接苗为材料,采用盆栽控水试验方法,分别在适宜水分、中度干旱胁迫、重度干旱胁迫及复水(土壤水分分别为田间最大持水量的70%～75%、45%～50%、25%～30%、75%～80%)条件下测试分析3个果桑品种的光合作用、光响应和CO2响应特征,评价果桑品种的抗旱能力。结果表明:干旱胁迫显著降低3个果桑品种的净光合速率、气孔导度、蒸腾速率、水分利用效率、瞬时光能利用效率和瞬时羧化效率,增加了胞间CO2浓度;3个果桑品种在不同土壤水分条件下对光强度和CO2浓度的响应曲线变化趋势基本一致,即在干旱胁迫下,3个果桑品种的最大净光合速率、表观量子效率、暗呼吸速率、瞬时羧化效率、光呼吸速率等均较适宜水分下降,复水处理后,各项响应值均有所回升。根据3个果桑品种在中度、重度干旱胁迫及复水条件下上述各项指标的变幅,比较品种的抗旱能力为:红果2号>大10>一串红。红果2号可在干旱缺水、光照较强的地区栽植。
The 3-year-old grafted seedlings of 3 mulberry varieties of Sang Sang, Dai 10 and Hongguo 2 were used as control materials, and potted water control experiment was used to study the effects of appropriate water, moderate drought stress, severe drought stress and rewatering Respectively, the field maximum water content of 70% to 75%, 45% to 50%, 25% to 30%, 75% to 80%) under the conditions of three fruit mulberry varieties tested photosynthesis, light response and CO2 response characteristics , Evaluate the mulberry varieties drought resistance. The results showed that: under drought stress, the net photosynthetic rate, stomatal conductance, transpiration rate, water use efficiency, instantaneous light use efficiency and instantaneous carboxylation efficiency of three fruit mulberry varieties significantly increased the intercellular CO2 concentration; Under different soil moisture conditions, the response curves of light intensity and CO2 concentration were basically the same. Under drought stress, the maximum net photosynthetic rate, apparent quantum yield, dark respiration rate, transient carboxylation Efficiency, respiration rate, etc. are more suitable for moisture decline, rehydration treatment, the response values have picked up. According to the three varieties of mulberry varieties under moderate and severe drought stress and rehydration conditions, the variation range of the above indexes is as follows: the red varieties 2> big 10> bunch of red varieties. Red 2 can be planted in arid and water-stressed areas.