蒙古黄芪根系分泌物的化感自毒效应研究Study on root exudates of allelopathic autotoxicity of Astragalus membranaceus Bge. var. mongholicus(Bge.) Hsiao
赵旭,王文丽,李娟
摘要(Abstract):
以蒙古黄芪为材料,研究了水培法收集的蒙古黄芪根系分泌物对蒙古黄芪种子萌发和幼苗生长的影响。结果表明:蒙古黄芪根系分泌物对其种子萌发和幼苗生长具有显著抑制作用,与对照相比,根系分泌物提取原液处理的发芽率、发芽势和发芽指数分别降低了43. 6%、34. 0%和59. 6%,根系分泌物提取原液对蒙古黄芪幼苗的化感自毒作用最强。经根系分泌物处理后,蒙古黄芪幼苗的超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性均有所增强,根系分泌物稀释倍数小于0. 6时,保护酶活性随着根系分泌物稀释倍数的减小而降低,提取物原液处理的保护酶活性最低。丙二醛(MDA)含量随根系分泌物浓度的升高而增大。根系分泌物稀释倍数小于0. 6时,蒙古黄芪的化感自毒效应随根系分泌物浓度的升高逐渐增强。
关键词(KeyWords): 蒙古黄芪;根系分泌物;化感自毒效应;水培法
基金项目(Foundation): 甘肃省农业科学院农业科技创新专项(2016GAAS34)
作者(Author): 赵旭,王文丽,李娟
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