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中国沙漠  2014 

NaCl处理对多枝柽柳(Tamarixramosissima)生长及生理的影响

DOI: 10.7522/j.issn.1000-694X.2013.00313

Keywords: 多枝柽柳(Tamarixramosissima),盐胁迫,抗氧化系统,渗透调节

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Abstract:

以1年生多枝柽柳(Tamarixramosissima)幼株为材料,采用盆栽试验研究不同浓度(0、50、100、200、400mmol·L-1)NaCl处理对多枝柽柳生长状况及叶片过氧化氢(H2O2)、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:低浓度(≤100mmol·L-1)的NaCl处理对多枝柽柳株高、冠幅面积、分枝数和叶、枝干重具有促进效应;高浓度(≥200mmol·L-1)的NaCl处理抑制了多枝柽柳生长,对侧根干重的抑制作用大于对冠幅面积、分枝数、叶干重、枝干重及株高的抑制.H2O2和MDA含量在低浓度(≤100mmol·L-1)NaCl处理下较对照未出现积累现象,随NaCl浓度升高(≥200mmol·L-1)二者含量较对照出现显著积累.低浓度(≤100mmol·L-1)NaCl处理下,多枝柽柳叶片SOD、POD、CAT和APX活性较对照均有所提高,高浓度的NaCl处理下SOD和POD活性开始降低.多枝柽柳叶片水势随NaCl处理浓度升高呈显著下降趋势.低浓度(≤100mmol·L-1)NaCl处理下脯氨酸和可溶性糖含量较对照呈上升趋势.

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