Resumo Foi realizado um experimento em casa de vegetação para avaliar os efeitos da inoculação de fungos micorrízicos arbusculares (FMAs) sobre o crescimento e nutrição de mudas de gravioleira (Annona muricata L.) em Latossolo Amarelo álico, fumigado e não fumigado. A inoculação foi feita durante o transplante; após cinco meses foram avaliados o crescimento e a absorção de nutrientes das mudas. A inoculação aumentou significativamente o crescimento da gravioleira no solo fumigado; o maior incremento foi observado nos tratamentos com Scutellospora heterogama e Gigaspora margarita. A eficiência da inoculação no solo fumigado variou de 594% a 1.348%. Embora o efeito da inoculação tenha sido reduzido no solo não fumigado, G. margarita, Entrophospora colombiana e Gigaspora sp. aumentaram significativamente o crescimento das mudas, e a eficiência da inoculação de 61% foi obtida com G. margarita; S. heterogama não se mostrou eficiente. No solo fumigado, G. margarita e Gigaspora sp. promoveram maior porcentagem de colonização radicular; no entanto, a colonização radicular não diferiu entre tratamentos com inoculação no solo não fumigado. Os teores e conteúdos de nutrientes variaram entre os tratamentos. A gravioleira é uma planta responsiva a FMAs, e a inoculação da espécie G. margarita beneficia o desenvolvimento das mudas de gravioleira nos solos fumigado e não fumigado.Termos para indexação: Annona muricata, frutas tropicais, mudas, fungos micorrízicos arbusculares. Effects of mycorrhizal inoculation on soursop seedlings in fumigated and not fumigated soilAbstract An experimental trial was carried out under greenhouse conditions to evaluate the effects of arbuscular mycorrhizal fungi (AMF) on Annona muricata L. (soursop) seedlings, in a fumigated and not fumigated Yellow Alic Latosol. Mycorrhizal inoculation was done during the transplanting of seedlings. Plant growth and nutrient concentration and content were evaluated five months later. Inoculation increased significantly the growth of soursop in fumigated soil and the increment was greatest in the treatments of Scutellospora heterogama and Gigaspora margarita. The inoculation efficiency in fumigated soil varied from 594% to 1,348%. Although the effect of inoculation was much lower in not fumigated soil, treatments with G. margarita, Entrophospora colombiana and Gigaspora sp. still increased significantly plant growth. A 61% inoculation efficiency was obtained with G. margarita while. S. heterogama was not efficient for soursop. In fumigated soil G. margarita and Gigaspora sp. caused the highest percentage of root colonization whereas in not fumigated soil, no significant differences were observed among inoculation treatments. Concentration and content of nutrients varied among treatments. Soursop is a mycorrhizal dependent plant and the inoculation of the specie G. margarita increases the growth of soursop seedlings in fumigated and not fumigated soil.Index terms: Annona muricata, tropical fruits, planting stock, arbuscular mycorrhizal fungi.(1) Aceito para publi...
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