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大田条件下,以农大364和郑单958为供试材料,对两种基因型玉米各生育时期苞叶细胞膜透性、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性以及丙二醛(MDA)积累状况进行了研究。结果表明,随着玉米生育进程的推进,MDA含量、细胞膜透性一直呈上升趋势,在蜡熟期达最大值,从抽丝期至蜡熟期农大364和郑单958的细胞膜透性分别增高54.39%和46.74%,MDA含量分别增高25.57%和70%;SOD、CAT和POD活性均呈现先逐渐升高后降低的趋势,农大364这3种酶的活性几乎在整个生育时期均高于郑单958,说明农大364苞叶具有更强的清除氧自由基能力,有利于在产量形成期维持较强的生理活性。图5,表1,参22。
Under field conditions, with Nongda 364 and Zhengdan 958 as test materials, the cell membrane permeability, superoxide dismutase (SOD), catalase (CAT), peroxidation (POD) activity and malondialdehyde (MDA) accumulation were studied. The results showed that the MDA content and membrane permeability increased with the progress of maize growth and reached the maximum at waxy stage. The membrane permeability of Nongda 364 and Zhengdan 958 increased from silkworm to wax maturity respectively 54.39% and 46.74% respectively. MDA content increased by 25.57% and 70% respectively. The activities of SOD, CAT and POD all increased at first and then decreased. The activities of these three enzymes of Nongda 364 were all higher than those of Zheng during the whole growth period Single 958, indicating that Nongda 364 husk leaves have a stronger capability of scavenging oxygen free radicals, which is conducive to maintaining strong physiological activity during the period of production. Figure 5, Table 1, reference 22.