VA菌根真菌提高杨树抗溃疡病机制的研究

本文研究了ＶＡＭ真菌诱导北京杨树皮中生化指标的变化与其抗溃疡病的关系。结果表明，菌根侵染率与宿主树皮中的相对膨胀度，过氧化物酶和多酚氧化酶的活性，有效磷和总酚的含量呈显著正相关，与可溶性总糖呈负相关；而杨树溃疡病菌的生长与上述各生化指标的相关性相反。

MECHANISM OF VESICULAR-ARBUSCULAR MYCORRHIZAL FUNGI ENHANCED RESISTANCE OF POPLAR TO CANKER

Biochemical index changes of Populus ‘beijingensis’ bark induced by the formation of associations with vesicular-arbuscular mycorrhizal(VAM)fungi and their ralation to canker resistance were studied. The results showed that mycorrhizal formation was positively correlated with relative turgidity, enzyme activities(peroxidase and polyphenoloxidase), available phosphorus and total phenolic content of bark, but negatively correlated with total soluble sugars in bark. The growth of Dothiorella gregaria was negatively correlated with VAM formation. VAM fungi increased canker tolerance of poplars by promoting the uptake of water and nutrients(mainly phosphorus), which in turn increased the growth and vigor of trees. Induced peroxidase and polyphenoloxidase activities of poplars should result in increases in substances such as phenolics which are likely to be important parts of the canker-resistance mechanisms of poplars.