Occurrence and infectivity of vesicular-arbuscular mycorrhizal fungi in north-western Italy vineyards
DOI:
https://doi.org/10.5073/vitis.1985.24.129-138Keywords:
mycorrhiza, infectivity, soil, acidity, phosphorus, host plant, ItalyAbstract
12 vineyards were surveyed during one year to assess root VA infection and spare population in the soil. 9 fungal species were present; 3 of them were more common and could be reinoculated successfully on grapevine. Other crops, in sites close to the vineyard sampled, often contained a different population of species. More species were present in soils of pH > 7.5.Spores were most abundant in autumn, their number decreasing in spring. Soils with least P and higher pH contained more spores. Root infection was unrelated to spare frequency or soil characters.
Infectivity of the soil on grapevine plants, assessed by means of the MPN method, was weil related to the number of spores present in the soil at the same time, if roots were removed. lt is concluded that spore numbers can express the ability of the soil to infect plants, thus showing where artificial inoculation could be potentially more effective.
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