涝渍对桃、李幼苗根系酶活性及渗透调节物质含量的影响

为了探讨涝渍胁迫对桃和李根部代谢的影响,以1年生索瑞斯李扦插苗和毛桃实生苗为试材,研究了在持续淹水胁迫下,其根系中无氧呼吸酶、抗氧化酶活性以及渗透调节物质含量的变化。结果表明,在持续淹水8d中,二者根系乙醇脱氢酶(ADH)活性均呈降-升-降的变化趋势;乳酸脱氢酶(LDH)活性则先升后降,但李苗LDH活性达最大值时间比桃苗早,达到峰值后李苗下降较慢而桃苗下降迅速;桃苗根系过氧化物酶(POD)活性变化呈先升后降的单峰曲线,而李苗呈升-降-升的双峰曲线,桃苗POD活性峰值比李苗高,而李苗POD保持较高活性持续时间长;过氧化氢酶(CAT)活性均呈降-升-降趋势,二者淹水前CAT活性很高;脯氨酸(Pro)含量均呈升-降-升的变化趋势,而可溶性糖含量变化幅度不大。

Change of Enzyme Activities and Osmotic Regulation Substances in Peach and Plum Seedling Roots Under Waterlogging

The aim of this paper is to study the effect of waterlogging on metabolism of peach and plum roots.Using one-year-old cuttings of Prunus americana March.cv.Soriso and one-year-old seedlings of Prunus persica(L.) Batsch.as experiment materials,the change rules of anaerobic respiratory and antioxidant enzyme activities,osmotic regulation substances in their growing roots under waterlogging were studied.Under continuously flooding for 8 days,alcohol dehydrogenase(ADH)activities showed a down-up-down trend in two kinds of materials;lactate dehydrogenase(LDH) activities first increased and then decreased,but in plum the maximum appeared earlier than in peach,and after reaching the peak,dropped more slowly too.Change of peroxidase(POD) activities showed a single peak curve of up to down in peach,and a double peak curve of up-down-up-down in plum;the peak was higher in peach than in plum but higher activity lasted for a long time in plum.Catalase(CAT) activities showed a drop-rise-drop trend and were very high before waterlogging.The content of praline(Pro) showed a rise-drop-rise trend,while the soluble sugar content changed a little.