Simbiose micorrÃzica arbuscular em porta-enxertos de videira (Vitis spp.)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Mycorrhizal symbioses in the rhizosphere of grapevine rootstocks IAC (313, 572 e 766), SO4, 420A, Paulsen e Harmony, in field at Petrolina, Pernambuco in werw evaluated (2004 and 2006). In 2004, glomerospore density (GD) varied from 26 to 82, while in 2006 was reduced to 5 and 98/100 g soil. Mycorrhizal colonization (MC) was evaluated only in 2006, and varied from 24.4 to 64.6 %. Glomalin production was higher in 2004 (2.42 to 4.05 mg/g) than in 2006 (0.01 to 0.05 mg/g soil). Twenty six taxons were identified and Glomus species were predominant. Significant differences in degree of symbioses between arbuscular mycorrhizal fungi and grapevine roots may be related to rootstock genotype. In order to evaluate the effect of mycorrhizal inoculation and phosphate fertilization on growth and nutrient uptake of grapevine rootstock (var. Harmony) was carried out one experiment in a factorial design with 3 inoculation treatments (control, mixture of Etrophospora. infrequens and Glomus etunicatum and G.etunicatum) and four P levels (0, 20, 40 and 60 mg P2O5) with four replicates. After 120 days, were evaluated leaf area, root and shoot fresh (FB) and dry (DB) biomass, nutritional content, MC and GD were evaluated. Inoculation and phosphate fertilization affected growth, nutrient uptake and had interaction between these factors. Mycorrhizal colonization and GD were about 25,39% and 6,49 glomerospores/50 g soil, respectively, and differences between the AMF species had not been detected. G. etunicatum inoculation benefited plant growth, while the mixture from E. infrequens improved only the nutrient content of the roots

ASSUNTO(S)

fungos micorrÃzicos arbusculares grapevine rootstock viticultura â vale do sÃo francisco (pe) arburscular mycorrhizal fungi botanica growth nutrient content videiras â colonizaÃÃo micorrÃzica

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