高温胁迫对不同小麦品种幼苗叶片中抗氧化酶活性的影响.PDFVIP

DOI :10.15933/j.cnki.1004 -3268.2008.12.011 2008 年第12 期 陈小霞,李　磊,牛洪斌,尹　钧 ( , 450002) :以2 个耐热性存在差异的小麦品种中国春和偃展4110为材料,采用42℃高温对4 叶1心幼 进行时间梯度胁迫处理,研究高温胁迫对小麦幼 叶片中超氧化物歧化酶(SOD)、过氧化氢酶(CAT ) 和过氧化物酶(POD)活性的影响。结果表明,高温胁迫可显著诱导小麦叶片中SOD 和POD 活性, 并 表现为先升后降,CAT 的活性总体呈现下降趋势;抗氧化酶活性在2 个品种间存在差异,偃展4110 的 SOD 和CAT 活性显著高于中国春,而中国春的POD 活性在胁迫早期与偃展4110 无显著差异,胁迫 后期显著高于偃展4110。 :小麦;幼 ;高温胁迫;抗氧化酶活性 :S512.1　　:A　　:1004-3268(2008)12-0038-04 Changes of Antioxidant Enzy es Activity in Wheat Seedlings Leaves under High Te perature Stress CHEN Xiao-xia,LI Lei,NIU Hong-bin,YIN Jun (National Engineering Research Center for Wheat, Henan Agricultural University,Zhengzhou 450002, China) Abstract:In order to elucidate the antioxidation echanis of wheat subjected to high te perature stress,changes of antioxidant enzy es activity under high te perature stress at seedling stages were studied by using two different heat-tolerancewheat (Triticum aestiv um L.)cultivars,ChineseSpring and Yanzhan 4110.The results showed that the activity of SOD and POD in heat-stressed wheat leaves in- creased significantly in both cultivars,while heat stress caused a progressive inhibition of the activity of CAT in high te perature treat ents co paring with the un-treat ent control.The results also showed that theactivity of SOD andCAT in Yanzhan 4110 were significantly higherthan that inChineseSpring. During theearly stageof heat stress theactivity of POD showed no significant differencein the two wheat cultivars,whilein the last 2 hours the activity of POD in Chinese Spring was higherthan that of Yanzhan 4110 significantly. Key words:Wheat (Triticum aestivum L.);Seedlings;Heat stress ;Antioxidant enzy es a