缺镁胁迫对龙眼叶片衰老的影响  

Effects of magnesium deficiency on senescence of Dimocarpus longana leaves.

作　　者：李延[1] 刘星辉[1] 

机构地区：[1]福建农林大学,福州350002

出　　处：《应用生态学报》2002年第3期311-314,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金 (4 97710 5 3 );福建省自然科学基金 (F990 2 0 );福建省高校测试基金 (JC990 0 62 )资助项目

摘　　要：选用苗龄为 180d的龙眼 (DimocarpuslonganaLour.cv .Wulongling)幼苗 ,采用水培实验方法 ,设正常供Mg(4mmol·L-1)、低Mg(0 .4mmol·L-1)和缺Mg 3个处理 ,并在移栽后 12 0d和 15 0d取样测定 .结果表明 ,随着缺Mg程度的加重 ,龙眼叶片的叶绿素含量、PSⅡ活性、光合作用速率降低 ;蛋白质和核酸含量减少 ;O-·2 产生速率、H2 O2 含量提高 ,膜脂过氧化加剧 ;CTK类物质 (ZR、DHZR、iPA)含量下降 ,ABA含量提高 。180days old Dimocarpus longana seedlings were grown in nutrition solution with three magnesium concentrations as 4 mmol·L -1 Mg\+\{2+\}(sufficient supply),0\^4 mmol·L -1 Mg\+\{2+\}(deficient supply),and Mg free (without supply). Leaves were sampled 120 and 150 days later after treatment. With an increase in severity of Mg deficient,the chlorophyll content,PSⅡ activityes,photosynthetic rate,protein,nucleic acid (DNA,RNA),and ZRs contents declined progressively. Whereas the content of H\-2O\-2,the rate of O -· 2 generation as well as the content of malondialdehyde (MDA) increased. The results suggested that magnesium deficiency had significant effect on the senescence of Dimocarpus longana leaves.

关 键 词：龙眼 缺镁胁迫 叶片衰老 

分 类 号：S667.2[农业科学—果树学] Q945.78[农业科学—园艺学]