冯婧玮;冯万艳;孙学广;

• 1:贵州大学贵州省森林资源与环境研究中心贵州大学林学院贵州大学贵州省高原山地林木培育重点实验室

摘要(Abstract)：

低磷和酸铝胁迫是酸性土壤限制植物生长的主要因素。有研究指出外生菌根(ectomycorrhiza,ECM)可提高宿主植物对铝毒害和低磷胁迫的适应性。然而，目前有关ECM真菌自身对低磷和酸铝环境的适应机理还不清楚。基于此，本研究以我国南方酸性土壤广泛分布的ECM真菌——粘盖乳牛肝菌Suillusbovinus为研究对象，在纯培养条件下研究了低磷、酸铝胁迫对其生长、营养吸收及菌丝分泌物的影响。结果表明，粘盖乳牛肝菌是一种耐铝型真菌，酸铝胁迫(1 mmol/L)不影响其菌丝生长，而低磷胁迫(20μmol/L)则显著限制其菌丝生长(P<0.05)。值得注意的是，低磷胁迫的抑制效应可被酸铝胁迫逆转。低磷胁迫显著降低了粘盖乳牛肝菌对磷的吸收(P<0.05)，而酸铝胁迫则对菌丝钾的吸收有促进作用。低磷、酸铝胁迫同样改变了菌丝分泌物组成。在低磷胁迫下，大量酚酸类、有机酸及脂质代谢物的积累量下调；而酸铝胁迫下则有大量酚酸类物质上调，有机酸和脂质中上调代谢物数量也高于下调数量；低磷酸铝复合胁迫下酚酸和有机酸类代谢物积累量均显著上调。另外，吲哚-3-乙酸(IAA)在各胁迫下均显著上调。以上结果可在一定程度上解释粘盖乳牛菌对低磷、酸铝环境的适应机理，并对后续进一步阐明ECM的共生适应机理有一定指导意义。

关键词(KeyWords)： 外生菌根真菌;酸铝;低磷;分泌物

Abstract:

Keywords:

基金项目(Foundation): 贵州省科技计划项目([2018] 5261);; 国家自然科学基金(31971572,31500090);; 贵州大学培育项目([2020] 47)~~

作者(Authors): 冯婧玮;冯万艳;孙学广;

DOI: 10.13346/j.mycosystema.210408

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