Root colonization of hybrid maize cultivars by mycorrhizal and pathogenic fungi at establishment in an acid soil with high phosphorus content
2012
M.J., Sainz | O., Aguín | M.J., Bande | G., Aris | C., Pintos | J.P., Mansilla
The formation of arbuscular mycorrhizas (AM), a symbiosis between roots and Glomeromycetes that improves P nutrition, health and stress tolerance of plants, can be important for establishment of maize in acid soils. In this work, a field experiment was set up in a limed acid soil with high Olsen-P content to study the colonization of roots by AM fungi and/or other soil borne fungi in 48 maize hybrid cultivars. Plants were under a severe drought at establishment. One month after sowing, AM fungi colonized over 40 per cent of the root length of most cultivars, suggesting a mycorrhizal dependency of these plants to withstand water stress conditions. Ten cultivars presented less than 20 per cent of AM root colonization. As determined by molecular methods, the most frequent AM fungi were Gigaspora decipiens and Glomus spp. Roots were also colonized by Pythium spp., Fusarium solani, and F. oxysporum.
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