摘要
采用土柱栽培与大田试验相结合的方法 ,研究了 2 0世纪 5 0年代以来我国主要推广玉米品种 (Zea mays L.)根系抗氧化保护酶活性的演进特性。研究表明 :随玉米品种更替 ,根系 SOD、CAT、POD等保护酶活性提高 ,膜脂过氧化产物 MDA含量降低 ,玉米品种更替的过程伴随根系清除活性氧的能力增强、衰老缓慢。当代品种根系 SOD、CAT活性在生育后期下降缓慢 ,显著高于 1970 s和 195 0 s品种 ,下层根系尤为明显。MDA含量则随生育进程的推进呈递增趋势 ,前期增加缓慢 ,后期增加迅速 ,上层根系高于中层和下层根系 ,生育前期品种间 MDA含量差异不显著 ,生育后期195 0 s品种显著高于 1970 s、 1990 s品种。当代品种具有更强的活性氧清除能力 ,后期膜脂过氧化伤害轻 。
The study was conducted in combining the field cultivation and limited soil cylinder cultivation, for comparisons of the commercial maize varieties planted in 1950s to 1990s in China to analysis the changes of root antioxidant enzymes activity. The result indicated that activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase(POD) activities increased, while malondialdehyde (MDA) content declined as the replacement of maize varieties continued in China. The process of the new variety released was gone together with the ability improvement against active oxygen in root and root senescence. This tendency was more obvious at later growth stage. For maize varieties of 1990 s, the root in deep soil showed higher activities of these protective enzymes and lower content of MDA than that of 1970 s and 1950 s varieties. These characteristics might be helpful for the maintenance of root physiological activity during the grain filling period for varieties of 1990 s.
出处
《作物学报》
CAS
CSCD
北大核心
2002年第3期384-388,共5页
Acta Agronomica Sinica
基金
国家自然科学基金 (No.3 0 10 0 10 8)
国家重大基础研究发展规划项目 (G19980 10 10 0)
关键词
玉米
品种更替
根系
保护酶活性
膜脂过氧化
生理特性
Maize ( Zea mays L.)
Varieties replacement
Root
Antioxidant enzyme activity
Membrane lipid peroxidation
