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NaCl胁迫下不同种源沙枣的生理特性

DOI: 10.11869/j.issn.100-8551.2015.11.2215, PP. 2215-2223

Keywords: 沙枣,NaCl胁迫,胁迫时间,种源,生理特性

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Abstract:

为了解沙枣的耐盐生理机制,以不同种源沙枣实生苗(阿拉尔种源和银川种源)为材料,采用盆栽控盐试验,研究不同NaCl浓度(0、0.15、0.30mol·L-1)和不同胁迫时间(7、30、60d)对沙枣生物量、根冠比及耐盐生理指标变化的影响。结果表明:随着NaCl浓度增加和胁迫时间的延长,生物积累量和叶绿素含量逐渐减少。胁迫30d后,阿拉尔种源生物积累量和叶绿素的最大下降幅度分别为36.92%和14.65%,而银川种源分别为41.86%和37.07%;随NaCl浓度增加,根冠比和丙二醛含量逐渐增加,阿拉尔种源增加幅度小于银川种源。脯氨酸含量随着NaCl浓度增加而增加,但随胁迫时间延长,增加幅度逐渐减少。胁迫7d时,可溶性糖含量随盐浓度增加呈下降趋势,随胁迫时间延长,逐渐转换为增加,在胁迫60d后,0.30mol·L-1NaCl水平下,阿拉尔沙枣叶片可溶性糖含量增加了36.69%,而银川仅有7.27%。因此,阿拉尔种源沙枣幼苗耐盐能力要强于银川种源,耐盐能力较强的沙枣种源可以更好的保护叶绿素,维持膜系统稳定,具有更强的渗透调节能力,保证生物量的积累。本研究可为优良耐盐沙枣种质筛选提供理论依据。

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