铁胁迫对苹果砧木根系活性氧含量及保护酶活性的影响

试验以SH40、M26两种苹果砧木为试材，研究了缺铁胁迫对根系组织中O2^-（超氧阴离子）含量及SOD（超氧化物歧化酶）、POD（过氧化物酶）活性的影响。结果表明：铁胁迫条件下SH加根系内O2^-含量升高，MDA含量降低，O2^-和MDA含量均高于M26根系内的。随着铁胁迫处理时间的延长，M26根系内SOD活性先升高后降低，POD活性一直升高；而SH加根系内SOD酶活性降低，POD活性先升高后降低。M26根系内SOD、POD活性均高于SH40。

Effect of Iron-Stress on the Contents of O2-.and SOD and POD Activity in Apple Rootstock Roots

The experiment was carried out using M26 and SH40 to study the effect of iron-stress on the contents of O2^- and MDA and the activity of SOD and POD in root of two rootstocks by the method of hydroponics. The result showed that contents of O2^- in SH40 roots increased but contents of MDA decreased under iron stresss. The contents of O2^- and MDA in the SH40 roots were higher than that in the M26 roots. The SOD activity increased firstly and decreased later and the POD activity increased in M26 roots with iron-stress time extended, but SOD activity dropped and POD activity increased firstly and decreased later in SH40 roots. The activity of SOD and POD in M26 roots were higher than that in SH40 roots.