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不同的植物、不同的品种对铝胁迫的生理响应不同,对于铝的耐受能力也不同。在确定铝胁迫浓度范围的基础上,设置5种浓度,水培处理,研究4种甘薯品种超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性,同时测定丙二醛(MDA)含量、质膜透性(MP)的变化。结果表明在低铝胁迫下,SOD、POD、CAT活性及MDA含量均高于对照。Al3+胁迫浓度为100μg·L-1时,徐105503的SOD活性达到最高,为对照的2.64倍;POD、CAT活性分别为对照的168.1%和200%,徐紫1和徐紫3的POD最高增量为44.8%和60%,CAT活性的最高增量分别达166.7%和151.6%,而当铝胁迫浓度为400μg·L-1时,4个品种甘薯的SOD、POD、CAT活性均出现下降,MDA及MP则随着铝浓度的不断升高而上升。从试验结果看,徐105503对Al3+胁迫的抗性要略大于其他3个品种。
Different plants, different varieties of different physiological responses to aluminum stress, aluminum tolerance is also different. Based on the determination of the concentration range of aluminum stress, five kinds of concentration and hydroponics treatments were set up to study the activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) The content of malondialdehyde (MDA) and the change of plasma membrane permeability (MP) were also determined. The results showed that the activity of SOD, POD and CAT and the content of MDA were all higher than those of the control under low aluminum stress. The highest SOD activity of Xu 105503 was 2.64 folds of that of the control when the Al3 + stress concentration was 100 μg · L-1, the POD and CAT activities were 168.1% and 200% of the control respectively, and the highest POD of Xuzi 1 and Xuwei 3 The highest increment of CAT activity reached 166.7% and 151.6%, respectively. However, when the aluminum stress concentration was 400 μg · L-1, the activities of SOD, POD and CAT of four cultivars of sweet potato decreased, MDA and MP increased with the increasing aluminum concentration. From the test results, Xu 105503 resistance to Al3 + stress is slightly larger than the other three varieties.