杂交鹅掌楸苗期超氧化物歧化酶和过氧化物酶的活力变异

在不同生长季节,对19个杂交鹅掌楸Liriodendron chinense×Liriodendron tulipifera家系和2个对照家系苗木的超氧化物歧化酶(SOD)和过氧化物酶(POD)的活力进行了测定,并对它们在家系间的变异以及与生长的关系进行了分析.结果表明,2种酶的活力表现出生长前期低于生长后期的趋势,并且在家系间的差异达到了显著或极显著水平.相关分析结果表明,生长性状与SOD活力呈显著正相关,而与POD活力负相关不显著.鹅掌楸Liriodendron chinense与北美鹅掌楸Liriodendron tulipifera的SOD活性均较低,有84.2%的家系SOD活性较两亲本种高,其余表现为两亲本种的中间类型;有63.2%杂种家系的POD活性表现为两亲本的中间类型.SOD可以作为评价和预测杂交鹅掌楸家系生长性状的生理生化指标之一.图2表3参10

Activity variation of superoxide dismutase and perosidase in hybrid tulip tree seedlings

Activities of superoxide dismutase(SOD) and perosidase(POD) in different series of the hybrid tulip tree were measured in different growth stages,and their relationship with growth traits were analyzed.The results showed that the activities were lower in early growth stage than in late stage while there was significant difference in activities of 2 enzymes in different series.Correlation analysis indicated that the activity of SOD was significantly correlated with height and collar diameter,which suggested the high activity of SOD would facilitate the growth of seedlings.In addition,the activity of SOD in 84.2 % of the hybrid families was higher than that in their parents,and activity of POD of 63.2 % of the hybrid series was in the middle level.The SOD could be used as one of physiology and biochemistry indices to evaluate and predict the growth of the hybrid tulip tree.[Ch,2 fig.3 tab.10 ref.]