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将木兰科6个树种进行28 d春旱处理,以观察田间生长状况,并测定土壤含水量及树种凋萎系数;干旱处理21 d时,测定植株叶片的抗氧化指标。结果表明:阔瓣含笑、乐昌含笑暂时凋萎系数均为7.6%,永久凋萎系数均为3.78%;金叶含笑、观光木、红花木莲、桂南木莲暂时凋萎系数均为14.2%,永久凋萎系数均为7.6%。根据以上结果及田间观察,6个供试树种抗旱能力由大到小排序为:阔瓣含笑、乐昌含笑、金叶含笑、观光木、桂南木莲、红花木莲。抗氧化指标测定结果显示:水分胁迫21d时,观光木和红花木莲总抗氧化能力有所降低,其余4个树种均升高;而抗坏血酸(Vc)和还原型谷胱甘肽(GSH)含量在6个树种中均升高。其中,阔瓣含笑和乐昌含笑升高幅度最大。
Six species of Magnoliaceae were subjected to spring droughts for 28 days to observe the field growth and to determine the soil water content and the withering coefficient of the tree species. Antioxidant indexes of the leaves were measured at 21 days of drought stress. The results showed that the coefficient of temporary wilting of both lobes and lakes was 7.6% and the permanent wilting coefficient was 3.78% 14.2%, the permanent wilting coefficient was 7.6%. According to the above results and field observations, the order of drought resistance of the six tested trees was as follows: broad-leaved and smiling, Lechang smile, gold leaf smile, sightseeing wood, Guilin Manglietia, safflower Manglietia. The results of antioxidant activity showed that the total antioxidant capacity of M. angustifolia and A. cantoniensis decreased at 21 d after water stress, and the other four species were all increased while the contents of ascorbic acid (Vc) and reduced glutathione (GSH) The content increased in all six species. Among them, the lobular smile and the highest increase in Lechang smile.