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外源一氧化氮对干旱胁迫下杨树光合作用的影响
引用本文:王淼,李秋荣,付士磊,董百丽.外源一氧化氮对干旱胁迫下杨树光合作用的影响[J].应用生态学报,2005,16(2):218-222.
作者姓名:王淼  李秋荣  付士磊  董百丽
作者单位:1. 中国科学院沈阳应用生态研究所,沈阳,110016
2. 南京军区总医院普外研究所,南京,210002
基金项目:国家自然科学基金项目(30271068),中国科学院沈阳应用生态研究所领域前沿资助项目.
摘    要:NO是生物体中一种自由基分子,其NO对树木叶片光合作用的影响研究未见报道.本文研究了外源NO对杨树叶片水分状况、光合作用和抗氧化物酶活力的调节作用.不同浓度SNP处理对杨树叶片含水量具有显著影响,杨树叶片含水率随着SNP浓度的提高而增加.当SNP浓度增加到500 μmol·L-1后各处理杨树叶片含水率变化趋于稳定.外源NO能提高水分胁迫下杨树叶片的光合、原初光能转化率Fv/Fm、Fm/Fo和Fv/Fo等的比值.其效果随水分胁迫时间的延长而降低.与此对应的是,短时间水分处理(1 h)的杨树叶片SOD和POD抗氧化物酶的活性显著高于长时间(3h)水分胁迫处理.SNP能显著提高不同干旱时间处理组的POD活性,而对SOD活性影响不明显.同时,随SNP浓度的增加,POD和SOD活性呈现先升后降的趋势.因此,干旱胁迫可引起杨树叶片光合效率降低,出现氧化伤害症状,外源NO可诱导抗氧化物酶POD和SOD活性的升高,缓解原初光能转化率Fv/Fm、Fm/Fo和Fv/Fo等值的降低,从而延缓活性氧积累,减轻水分胁迫对杨树叶片光合作用的影响.

关 键 词:NO  水分胁迫  杨树  叶绿素荧光参数  保护
文章编号:1001-9332(2005)02-0218-05
收稿时间:2002-10-12
修稿时间:2002年10月12

Effects of exogenous nitric oxide on photosynthetic characteristics of poplar leaves under water stress
WANG Miao,LI Qiurong,FU Shilei,DONG Baili.Effects of exogenous nitric oxide on photosynthetic characteristics of poplar leaves under water stress[J].Chinese Journal of Applied Ecology,2005,16(2):218-222.
Authors:WANG Miao  LI Qiurong  FU Shilei  DONG Baili
Institution:Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. wangmiao@iae.ac.cn
Abstract:Nitric oxide (NO) is an active molecule involved in many biological pathways, but its effects on photosynthesis of tree leaves have not been established yet. This paper studied the effects of exogenous NO, sodium nitroprusside (SNP), on the water status, photosynthesis and scavenging enzyme activities in poplar leaves. Different levels of SNP treatments had remarkable effects on the water content of leaves, which increased with increasing SNP levels. When the SNP level exceeded 500 micromol x L(-1), differences in leaf water content were no longer significant between different SNP treatments. Exogenous NO increased the photosynthesis rate, photochemical efficiency of PSII Fv/Fm, and Fm/Fo and Fv/Fo ratios, and the effects decreased with increasing duration of water stress. The SOD and POD activities in poplar leaves were higher in 1 hour water stress treatment than in 3 h treatment. Treating with SNP could markedly increase POD activity, but SOD activity did not change much. POD and SOD activities increased initially, and then decreased with increasing SNP levels. The results indicated that exogenous NO delayed the accumulation of active oxygen by increasing POD and SOD activities, and thereby, alleviated the effects of water stress on photosynthetic organization of poplar leaves.
Keywords:Nitric oxide  Water stress  Poplar  Chlorophyll fluorescence parameter  Protection  
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