缺镁胁迫对龙眼叶片衰老的影响

摘要/Abstract

摘要： 选用苗龄为180d的龙眼(Dimocarpus longana Lour.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Mg3个处理,并在移栽后120d和150d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;O₂^-.产生速率、H₂O₂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,说明缺Mg对龙眼叶片的衰老有明显影响.

关键词: 龙眼, 缺镁胁迫, 叶片, 衰老, BEPS模型, 净初级生产力, 参数优化, 总初级生产力, 协同应用

Abstract: 180days old Dimocarpus longana seedlings were grown in nutrition solution with three magnesium concentrations as 4 mmol·L^-1 Mg²⁺(sufficient supply),0.4 mmol·L^-1 Mg²⁺(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 H₂O₂,the rate of O₂^-. 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.

Key words: Dimocarpus longana, Magnesium deficiency, Leaves, Senescence, net primary productivity, collaborative application, gross primary productivity, BEPS, parameter optimization

中图分类号:

李延, 刘星辉. 缺镁胁迫对龙眼叶片衰老的影响[J]. 应用生态学报, 2002, (3): 311-314.

LI Yan, LIU Xinghui . Effects of magnesium deficiency on senescence of Dimocarpus longana leaves[J]. Chinese Journal of Applied Ecology, 2002, (3): 311-314.

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