Abstract

CASTILLO SALLE, Alicia et al. Mycorrhization of micropropagated apple rootstocks. cultrop [online]. 2016, vol.37, suppl.1, pp. 7-12. ISSN 1819-4087.

Micropropagation through in vitro plant cultivation allows large-scale production of identical individuals genetically to the starting material. Woody species have difficulties in the acclimatization stage due to their slowness in the development of physiological response to environmental changes. The ultimate success of in vitro propagation depends on the capacity of plants to adapt in the moment of transfering from the laboratory to the greenhouse conditions. One of the tools to offset losses during acclimatization is the use of arbuscular mycorrhizal fungi (AMF), which sets mutualistic symbiotic associations unspecific with 90 % of vascular plants. AMF, because of their action as agents of growth bioregulation as bio-fertilizers or biocontrollers have received special attention in handling and propagation of fruit plants. In this work the effects of inoculation with AMF at the start of acclimatization are presented to mycorrhization. Inoculation with one type of AMF over two rootstocks of apple was done in a clone of M9 and one rootstock of the Cornell-Geneva series (RN29 and Geneva^®41 respectively) set in three different substrates. Seedlings inoculated with AMF when compared to the control, presented further expansion of their leaves, bigger diameter and greater height, all significantly different. Acclimatization period was reduced from 60 to 40 days. The incorporation of this type of technologies could generate a more sustainable management of plant production with less use of agrochemicals

Keywords : adaptation; vegetative propagation; simbiosis.

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