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基于抗氧化系统的美丽箬竹水分生理整合作用分析

胡俊靖1,2,陈卫军1,郭子武2**,陈双林2,杨清平2,李迎春2   

  1. 1中南林业科技大学, 长沙 410000; 2中国林业科学研究院亚热带林业研究所, 浙江富阳 311400)
  • 出版日期:2015-04-10 发布日期:2015-04-10

Effect analysis of water physiological integration of Indocalamus decorus based on antioxidant system.

HU Jun-jing1,2, CHEN Wei-jun1, GUO Zi-wu2**, CHEN Shuang-lin2, YANG Qing-ping2, LI Ying-chun2   

  1. (1Central South University of Forestry and Technology, Changsha 410000, China; 2Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China)
  • Online:2015-04-10 Published:2015-04-10

摘要: 本文以分株相连的美丽箬竹(Indocalamus decorus)盆栽苗为试材,设置3个盆栽基质相对含水率(90%±5%高水势、60%±5%中水势、30%±5%低水势)和3个水势差处理(90%~60%、60%~30%、90%~30%),研究美丽箬竹克隆分株抗氧化系统对异质水分环境的响应规律,分析水分生理整合发生条件、方向和强度。结果表明: 随处理时间的延长,美丽箬竹叶片MDA、可溶性蛋白质含量和CAT、POD活性总体上呈升高趋势;SOD活性呈降低趋势;随分株间水势差的增大,低水势处理分株叶片CAT、SOD活性和可溶性蛋白质含量升高,POD活性、MDA含量降低,高水势处理分株的变化规律相反,中水势处理分株叶片抗氧化生理指标总体上变化不明显;在异质水分环境下美丽箬竹克隆系统存在水分生理整合作用,分株首先保障自身的水分需求,当克隆分株同时存在水分丰盈、亏缺时,会发生强烈的从高水势向低水势分株的水分转移,分株间水势差越大,整合强度越高;克隆分株在水分生理整合上存在“利己”和“利他”行为。本研究为商品竹林水分人工供应提供了理论依据。

关键词: 全氮, 全磷, 速效磷, 铵态氮, 互花米草湿地

Abstract:

To explore the occurrence condition, direction and intensity of water physiological integration in bamboo, an experiment with connected Indocalamus decorus clonal ramets under three water potential gradients of soil matrix (90%-60%, 60%-30%, 90%-30%) and three matrix relative water content (90%±5%, high water potential; 60%±5%, intermediate water potential; 30%±5%, low water potential) was conducted, and the activities of antioxidant enzymes and the contents of soluble protein and MDA were determined. The results showed that the contents of MDA and soluble protein and the activities of CAT and POD increased, while SOD activity decreased with the increase of treatment time. With the increase of water potential difference between I. decorus ramets, CAT and SOD activities and soluble protein content of ramets under the low water potential increased, while POD activity and MDA content decreased; but ramets under the high water potential had an opposite pattern. Antioxidant physiological indicators of ramets under the intermediate water potential had no significant differences during the treatment time. Our study indicated that water physiological integration existed in I. decorus clonal system under heterogeneous water environment and ramets needed first to guarantee its own water demand. Intense water transfer from high water potential ramets to low water potential ramets would take place when water surplus and deficit existed between ramets. The bigger the water potential difference of ramets, the stronger the intensity of physiological integration. Clonal ramets had “selfish” and “altruistic” behaviors on water physiological integration. This study provided a theoretical basis for artificial water supply of commercial bamboo forests.

 

Key words: Spartina alterniflora wetland, NH4+-N, AP, TP, TN