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External arbuscular mycorrhiza (AM) mycelium plays an important role in soil while interacting with a range of biotic and abiotic factors. One example is the soil organic amendment sugar beet waste. The fermented Aspergillus niger-sugar beet waste (ASB) increases growth and P uptake by the AM mycelium in soil whereas non-fermented waste (SB) had a strong inhibitory effect. The underlying mechanisms are not understood.We used gas chromatography-mass spectrometry to identify differences in composition of water extracts of ASB and SB. The chromatograms showed that ferulic acid was present in SB and absent in ASB. We compared the effects of the water extracts of SB and ASB and ferulic acid upon the growth of Glomus intraradices in in vitro monoxenic cultures.Hyphal growth of the AM fungus G. intraradices was extremely reduced in ferulic acid and SB treatments. Moreover, AM hyphae appeared disorganized, undulated and tangled. In contrast, ASB increased hyphal length and numbers of branched absorbing structures and of spores. We conclude that ferulic acid is one compound in SB which is responsible for its inhibition of AM extraradical growth. The relevance of these findings is discussed.  相似文献
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为了揭示亚麻籽中酚酸类化合物的组成、形态及分布情况,采用反相高效液相色谱法-二极管阵列技术,对亚麻籽粉乙醇提取物的碱解、酶解产物进行鉴定与分析.结果表明,开环异落叶松树脂素酚二葡萄糖甙(SDG)、阿魏酸和对香豆酸以稳定的结合态存在于亚麻种子中;不同水解方法对酚酸化合物的释放量具有显著影响,高温(120℃)碱解条件下SDG的释出量最大;不同品种间各组成成分基本相同,但含量差异显著,其中SDG的质量分数为8~ 16.5mg·g-1,对香豆酸、阿魏酸的质量分数为0.3~1.35mg·g-1,阿魏酸与对香豆酸含量之间存在显著的相关性(R=0.89*).本研究为亚麻籽酚酸资源开发过程中的原料选择、工艺确定、质量控制等环节提供了技术支持.  相似文献
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