首页|NaCl处理对胡杨生长及生理生态特征的影响

NaCl处理对胡杨生长及生理生态特征的影响

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以胡杨(Populus euphratica)幼株为材料,采用盆栽试验研究不同NaCl浓度(0、50、100、200 mmol·L-1和400 mmol·L-1)处理对胡杨生长及叶片过氧化氢(H2O2)和丙二醛(MDA)含量,超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)活性、水势、可溶性糖和脯氨酸含量的影响.结果表明:在≥200 mmol·L-1 NaCl处理下,胡杨株高较对照显著减少,在400 mmol·L-1 NaCl处理下,基茎粗较对照显著减少,在NaCl浓度≥100 mmol·L-1时,冠幅面积和叶、枝干重较对照显著减少,根干重随NaCl浓度的增加呈显著线性减少趋势.在NaCl浓度≥200 mmol·L-1时,根冠比较对照显著减少.H2O2和MDA含量随NaCl处理浓度升高呈增加趋势.低浓度NaCl处理下(50 mmol· L-1),胡杨叶片SOD、POD、CAT和APX活性较对照均有所提高,在NaCl浓度≥100 mmol·L-1时,SOD、POD和APX活性较对照降低.胡杨叶片水势随NaCl处理浓度升高而降低.在NaCl处理90d后,胡杨叶片可溶性糖含量随NaCl浓度升高呈逐渐降低趋势.胡杨叶片脯氨酸含量随NaCl处理浓度增加呈先增加后减少的趋势.
Effects of NaCl Treatments on Growth and Ecophysiological Characteristics of Populus euphratica
A pot experiment was conducted to study the effects of different NaCl concentrations (0,50,100,200mmol · L-1 and 400 mmol · L-1) on the growth,leaf hydrogen peroxide (H2O2),malonaldehyde (MDA) content,superoxide dismutases (SOD),catalases (CAT),peroxidase (POD),ascorbate peroxidase (APX) enzymes activity,water potential,soluble sugar and proline contents of Populus euphratica.The results showed that plant heights were significantly inhibited under 200 mmol · L-1 NaCl treatment compared with control; Basal stem diameter were significantly inhibited under 400 mmol · L-1 NaCl treatment compared with control; Crown area,leaf dry mass and branch dry mass decreased remarkably under NaCl concentration ≥ 100 mmol · L-1 compared with control level; Root dry mass decreased with the increasing in NaCl concentrations.Root shoot ratio decreased markedly under NaCl concentration ≥200 mmol · L-1 compared with control.H2O2 and MDA content increased with the increasing in NaCl concentrations.SOD,POD,CAT and APX activities in leaves of P.euphratica increased compared with control lever at low NaCl concentrations (50 mmol · L-1),whereas SOD,POD and APX activities began to descend under NaCl concentration ≥ 100 mmol · L-1 compared with control level.Water potential in leaves of P.euphratica reduced with the increasing in NaCl concentrations.Being treated for 90 d,soluble sugar decreased with the increasing in NaCl concentrations.Proline content in leaves of P.euphratica first increased and then decreased compare with control level.

Populus euphraticasalinity stressMDA contentantioxidative enzyme systemosmotic regulation

鲁艳、雷加强、曾凡江、徐立帅、彭守兰、刘国军

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中国科学院新疆生态与地理研究所,新疆策勒荒漠草地生态系统国家野外科学观测研究站,新疆乌鲁木齐830011

胡杨(Populus euphratica) 盐胁迫 MDA含量 抗氧化系统 渗透调节

中国科学院“西部之光”人才计划西部博士专项国家自然科学基金国家科技支撑计划项目

XBBS201109413011032009BAC54B01

2015

10.13866/j.azr.2015.02.10

干旱区研究
中国科学院新疆生态与地理研究所 中国土壤学会

干旱区研究

CSTPCDCSCD北大核心
影响因子：1.157
ISSN：1001-4675
年,卷(期)：2015.32(2)
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