PINTO, J.E.B.P.; SIQUEIRA, J.O.; BLANK, M.F.A. Fungos micorrízicos-arbusculares no desenvolvimento de mudas de helicônia e gérbera micropropagadas. Horticultura Brasileira,Brasília, v. 17, n. 1, p. 25-28, março 1999. Fungos micorrízicos-arbusculares no desenvolvimento de mudas de helicônia e gérbera micropropagadas. RESUMOPlântulas micropropagadas de helicônia (Heliconia sp) gérbera (Gerbera sp) de vaso, foram aclimatadas em substrato (torta de filtro 50%, solo 30% e areia 20%), inoculado com três espécies de fungo micorrízico (Glomus clarum Nicolson. & Schenck, Glomus etunicatum Becker & Gerdemann e Gigaspora margarita Becker & Hall) e uma mistura destas espécies (inóculo múltiplo). As avaliações quanto ao desenvolvimento da parte aérea e do sistema radicular e porcentagem de colonização, foram feitas aos 60 dias para gérbera e aos 90 dias para helicônia, após transplante. As duas espécies comportaram-se de modo diferente em resposta à micorrização. Glomus etunicatum não colonizou bem nenhuma das duas espécies estudadas. Apesar da elevada colonização, a helicônia não se beneficiou da inoculação, enquanto que a gérbera beneficiou-se da inoculação com G. clarum, G. etunicatum e do inóculo misto. Palavras-chave:Heliconia sp., Gerbera sp., micropropagação, aclimatação, micorrizas. ABSTRACT Application of arbuscular mycorrhiza to micropropagated heliconia and gerbera plants during acclimatization period.Heliconia (Heliconia sp.) and pot gerbera plantlets (Gerbera sp.) obtained by in vitro micropropagation on Murashige and Skoog (MS) medium were inoculated with 3 vesicular arbuscular mycorrhiza (VAM) species and a mixture of three species. A control treatment without inoculation was also included. The plantlets were acclimated in a mixture of soil 30%, sand 20% and torta de filtro 50%. The fungal species were Glomus clarum, Glomus etunicatum and Gigaspora margarita. At 60 days for gerbera and 90 days for heliconia after the inoculation, fresh and dry matter of the aerial and root parts were determined, and the percentage of mycorrhizal colonization of the roots was obtained. Both species behaved different to mycorrhization. Glomus etunicatum did not show to be effective in colonization of heliconia and gerbera. Colonization was high, but heliconia did not benefit from this inoculation, however Gerbera was benefited by G. clarum, G. etunicatum and mixture inoculation.
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