Mycorrhizal association studies in six native forestry species of Rio Grande do Sul state

Abstract

Ao favorecer o crescimento das plantas hospedeiras, a micorriza pode ser um fator importante para as ess\ueancias florestais nativas do estado do Rio Grande do Sul. O objetivo deste trabalho foi identificar o tipo de micorriza em seis esp\ue9cies florestais do Estado: pinheiro-do-paran\ue1 (Araucaria angustifolia (Bertol.) Kuntze), timba\ufava ( Enterolobium contortisiliquum (Vell.) Morong), canaf\uedstula ( Peltophorum dubium (Spreng) Taub), ip\uea-amarelo ( Tabebuia chrysotricha (Mart. ex DC.) Standl.), ip\uea-roxo ( Tabebuia heptaphylla (Well.) Toledo) e gr\ue1pia ( Apuleia leiocarpa (Vogel) J.F. Macbr). O estudo foi desenvolvido na Fepagro Floresta \u2013 Boca do Monte, Santa Maria, em bosques de esp\ue9cies nativas e plantadas. As amostras de ra\uedzes, os corpos de frutifica\ue7\ue3o dos fungos e o solo foram analisados no laborat\uf3rio. As ra\uedzes foram processadas e analisadas quanto ao tipo de micorriza presente. Os fungos ectomicorr\uedzicos nativos encontrados foram identificados, isolados e mantidos em cultura. As esp\ue9cies estudadas n\ue3o apresentaram coloniza\ue7\ue3o ectomicorr\uedzica, embora em alguns locais tenham sido encontrados esporocarpos pr\uf3ximos \ue0s plantas. A associa\ue7\ue3o com micorrizas arbusculares foi encontrada em todas as esp\ue9cies de ess\ueancias florestais nativas estudadas.Mycorrhizal associations could promote plant growth in native forestry species in Rio Grande do Sul State. The aim of this work was to identify mycorrhizal associations in six native forestry species: Araucaria angustifolia (Bertol.) Kuntze, Enterolobium contortisiliquum (Vell.) Morong, Peltophorum dubium (Spreng) Taub., Tabebuia chrysotricha (Mart. ex DC.) Standl., Tabebuia heptaphylla (Well.) Toledo) and Apuleia leiocarpa (Vogel) J.F. Macbr.). The study was done at Fepagro Forestry \u2013 Boca do Monte, Santa Maria, in cultivated and natural forest stands. Roots, fungal fruiting bodies and soil were analyzed in laboratory. Roots were processed and analyzed considering the formation of mycorrhizal association. Ectomycorrhizal fungi growing in the forest areas were identified, isolated and multiplied. The plants showed no ectomycorrhizal colonization, even though sporocarps of these fungi had been found close to the plants in some sites. The presence of arbuscular mycorrhizal was observed in all native forestry species studied

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