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【目的】分析泡桐黄化突变体的生理特性,为泡桐新品种的研究及应用提供理论参考。【方法】将新发现的泡桐黄化突变体(PFE)与白花泡桐(PF)、建始泡桐(PJ)、楸叶泡桐(PC)的生理特征进行比较,分析了其光合色素的含量、光合日变化、抗氧化酶活性及丙二醛含量。【结果】黄化突变体的叶绿素a、叶绿素b、总叶绿素、类胡萝卜素含量减少,其中叶绿素b显著减少;黄化突变体的净光合速率和蒸腾速率总体小于其他种,气孔导度值与其他种相比总体降低,但差异较小,胞间CO_2浓度日变化值均高于其他种;泡桐黄化突变体的SOD、POD、CAT活性和丙二醛(MDA)含量均高于其他种。【结论】光合色素的减少是导致叶色黄化的主要原因;它影响了植株捕光能力,致使净光合速率下降,抗氧化酶活性增强,植株抗性增加,可减少活性氧对植株的伤害,维持植物正常生长。
【Objective】 The physiological characteristics of paulownia yellow mutant were analyzed to provide theoretical reference for the research and application of paulownia new variety. 【Method】 The physiological characteristics of newly discovered Paulownia tomentosa mutants (PFE) and P. paulownia (PF), P. juncea (PJ) and S. paulownis were compared. The photosynthetic pigment content, Changes, antioxidant enzyme activity and malondialdehyde content. 【Result】 The results showed that the contents of chlorophyll a, chlorophyll b, total chlorophyll and carotenoid in yellow mutant decreased, and the chlorophyll b decreased significantly. The net photosynthetic rate and transpiration rate of yellow mutant were lower than those of other species, But the difference was smaller and the diurnal variation of intracellular CO_2 concentration was higher than other species. The activities of SOD, POD, CAT and the content of malondialdehyde (MDA) in the yellowing mutants were higher than those in other species . 【Conclusion】 The decrease of photosynthetic pigment is the main reason of yellowing of leaf color. It affects the light harvesting ability of plants, resulting in the decrease of net photosynthetic rate, the increase of antioxidant enzyme activity and the increase of plant resistance, which can reduce the harm of reactive oxygen species to plants , To maintain the normal growth of plants.