Mycorrhizal dependency of mangaba tree under increasing phosphorus levels

Pesquisa Agropecuária Brasileira

Júlio Alves Cardoso Filho¹  Eurico Eduardo Pinto De Lemos¹  Tania Marta Carvalho Dos Santos¹  Luis Carlos Caetano²  Marco Antonio Nogueira² 

[1] ,Universidade Federal de Alagoas Departamento de Fitotecnia e Fitossanidade Rio Lago AL ,Brazil

关键词: Gigaspora margarita;    Glomus etunicatum;    Hancornia speciosa;    biofertilizers;    native mycorrhizal fungi;    phosphorus nutrition;    Gigaspora margarita;    Glomus etunicatum;    Hancornia speciosa;    biofertilizantes;    fungos micorrízicos nativos;    nutrição fosfatada;   

DOI  :  10.1590/S0100-204X2008000700013

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the mycorrhizal dependency of mangaba tree (Hancornia speciosa) plantlets, under increasing levels of phosphorus fertilization. The experimental design was completely randomized in a 4×5 factorial arrangement with three mycorrhizal fungi inocula - Gigaspora margarita, Glomus etunicatum, or a pool of native mycorrhizal fungi (Acaulospora longula, Glomus clarum, Gigaspora albida, Paraglomus sp.) -, and a nonmycorrhizal control, in combination with five levels of phosphorus applied to the substrate: 0, 25, 50, 75, and 100 mg kg-1. After 180 days of growth, plantlets with inoculation of native mycorrhizal pool produced more shoot and root dry biomass and had higher shoot phosphorus content and accumulation. The noninoculated control showed the lowest values, independently of the phosphorus level. The highest relative mycorrhizal dependency occurred with the inoculation of native mycorrhizal fungi. Plants with mycorrhizal fungi did not respond to phosphorus addition above 50 mg kg-1. Mangaba tree is highly dependent on mycorrhiza, but the degree of dependency varies according to phosphorus levels and fungal inocula. In general, mangaba tree is more responsive to mycorrhizal fungi inoculation than to phosphorus addition.

【 授权许可】

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