Mycorrhizal association on micropropagated plantlets of Jatropha curcas L. / Associação micorrízica arbuscular em plantas micropropagadas de Jatropha curcas L. (pinhão-manso)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The objective of this work was to evaluate the effects of the arbuscular mycorrhizal fungus (AMF), Glomus clarum, multiplied monoxenically in transformed carrot roots, on the growth, survival, mycorrhizal colonization and root development of micropropagated plantlets in different stages of rooting. Inoculation was performed in vitro and ex vitro conditions. Micropropagated plantlets with 0, 14 or 21 days maintained in rooting medium, supplemented or not with 1 mg L-1 of Indolbutiric acid (IBA), were transferred to a substrate composed by sand:soil:vermiculite (1:1/2:1). The in vitro system allowed the establishing mycorrhizal association, but no stimulatory effect on the development of shoot or root by mycorrhizal inoculation was observed. The period of time and addition of IBA did not affect plant growth. In ex vitro system, the stimulatory effects of arbuscular mycorrhizal association were evident in all evaluated characteristics, except to plant height. Plants that were not submitted to rooting showed growth similar or superior to those that were maintained in the rooting media, independent of IBA addition. Inoculated plants were shown to be more efficient at nutrient absorption, especially to phosphate. The arbuscular mycorrhizal association promotes beneficial effects when inoculation is performed ex vitro and the best period for inoculation of physic nut seedlings is in the beginning of acclimatization, without in vitro rooting phase. Inoculation of physic nut with arbuscular mycorrhizal fungi showed to be an important tool for micropropagated seedlings production.

ASSUNTO(S)

fungos micorrízicos arbusculares pinhão-manso micropropagação arbuscular mycorrhizal fungi pinyon pine microbiologia e bioquimica do solo micropropagation plantlets

ACESSO AO ARTIGO

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