水分胁迫下不同进化型小麦抗氧化能力比较

Anti-oxidation Capacities of Different Wheat Genotypes under Water Stress

以6种不同基因型小麦为试验材料,研究了水分胁迫下不同生长期小麦体内超氧化物歧化酶(SOD)活性以及超氧自由基(O2.-)含量变化,并分析了两者之间的相关关系.结果表明,水分胁迫下6种基因型小麦SOD活性及超氧自由基含量在拔节期和灌浆期均有不同程度的增加;栽培型品种SOD活性增幅高于野生型品种,超氧自由基增幅较低;同样,二粒小麦与一粒小麦相比,二粒小麦SOD活性增幅高于一粒小麦,超氧自由基增幅较低;但现代栽培小麦种表现不明显.结果说明,栽培型与野生型小麦相比,二粒小麦与一粒小麦相比,具有较强的抗氧化能力.

Six genotypes of wheat were used to study SOD activities and superoxide radical （O2） contents at different stages of wheat growth and analyze the relations between the two. The results showed that the SOD activities and superoxide radical contents of the six genotypes increased at both the jointing and seed-filling stages to a varying extent. The domesticated species increased more in SOD activity content than the wild species did, and showed a lower increment in superoxide radical content; similarly, einkorn species increased more in SOD activity than emmet species, and showed a lower increment in superoxide radical content; modern domesticated wheat species showed not variation in SOD activity and superoxide radical content. The results proved that domesticated wheat species and emmet species had higher anti-oxidation capacities than wild species and einkorn species, respectively.