茭白肉质茎膨大过程中3种保护酶的活性变化

Activity Changes of Three Protective Enzymes during Stem Swelling in Zizania latifolia Turcz.

以双季茭白浙茭3号、浙茭5号为试验材料,选择不同生长阶段的肉质茎,分别测定多酚氧化酶(PPO)、过氧化氢酶(CAT)、过氧化物酶(POD)的活性。试验结果表明,在茭白肉质茎的膨大过程中,PPO、CAT的活性呈膨大前期下降,后期上升的趋势。PPO的活性在生长后期有明显的上升。POD的活性总体呈下降趋势,生长后期活性趋于稳定。浙茭3号、浙茭5号3种保护酶的变化趋势一致,但品种间不同酶的活性有差异。

Taking the two water bamboo （Zizania latifolia Turez.） cultivars Zhejiao No.3 and Zhejiao No.5 as materials, the activities of polyphenol oxidase （PPO）, catalase （CAT） and peroxidase （POD） were determined respectively at the different growth stages of the stem swelling. The results showed that, the PPO and CAT activities declined at earlier swelling stages, and rose afterwards, while the PPO activity increased significantly in the later growth stages. The POD activity decreased slowly during stem swelling, but was stable at the later growth stages. The change trends of PPO, CAT and POD activities were consistent, but the activities of the enzymes were different between Zhejiao No.3 and Zhejiao No.5.