盐胁迫和AM真菌对生菜生长的效应
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* 农业部蔬菜遗传与生理重点开放实验室基金;教育部科学技术研究重点项目(105012)资助


EFFECT OF SALT STRESS AND AM FUNGI ON GROWTH OF LETTUCE
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    摘要:

    试验设不接种、接种Glomus intraradices(BEG141)、接种Glomus mosseae(BEG167)3个接种处理,每个接种处理下再设电导率(EC)为607μScm-1(低盐)、1236μScm-1(中盐)、1866μScm-1(高盐)等3个不同盐水平处理。试验结果表明:随着土壤EC值的增加,生菜生物量降低,但在低盐胁迫下,非菌根植株降低幅度大于菌根植株。与不接种处理相比,在低盐和中盐条件下,接种菌根真菌的植株体内NO3-含量、植株地上部干重增加;同一土壤盐水平下,接种处理的植株磷、叶绿素含量高于不接种处理的;在低盐下,接种处理的植株的根系可溶性糖含量高于不接种处理的,但在1236和1866μScm-1的盐度下,接种处理的植株根系可溶性糖含量低于不接种处理的。说明在施肥过量引起的次生盐渍化土壤中,AM真菌侵染对生菜在低盐胁迫下的生长存在促进作用,而在高盐胁迫下,使其生长受到抑制。

    Abstract:

    In order to test the hypothesis that arbuscular mycorrhizal fungi (AM fungi) can improve growth of vegetables cultivated in protected horticulture soils which was affected by secondary salinization as a result of over-fertilization,Lactuca sativa plants growing at three soil EC levels (607,1 236 and 1 866μS cm-1) were inoculated with Glomus intraradices (BEG141) and Glomus mosseae (BEG167).Results show that with the increase in soil EC value,the lettuce decreased in biomass,but this decrement was greater in CK than in the inoculation treatment when soil EC was low,eg.607μScm-1.Compared with the plants in CK,the inoculated plants had a higher NO3- concentration at the soil EC level of 607 and 1 236μScm-1,higher P and chlorophyll concentrations at the same soil EC level.and a higher soluble sugar concentration in the root when soil EC was 607μScm-1,but a lower when it was increased to 1 236 and 1 866μScm-1.The findings suggest that AM fungi can improve the growth of lettuce plants at a lower soil salt (607μScm-1) level,but reduced the growth at a higher level (1 866μScm-1).Its possible mechanisms are to be discussed.

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郑义艳,冯固.盐胁迫和AM真菌对生菜生长的效应[J].土壤学报,2006,43(6):966-971. DOI:10.11766/trxb200507280613 Zheng Yiyan, Feng Gu. EFFECT OF SALT STRESS AND AM FUNGI ON GROWTH OF LETTUCE[J]. Acta Pedologica Sinica,2006,43(6):966-971.

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  • 收稿日期:2005-07-28
  • 最后修改日期:2006-03-15
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  • 在线发布日期: 2013-02-25
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