Response of antioxidant enzymes and potato vitroplant growth mycorrhized in vitro
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Abstract
tuberosum) micropropagation still has some problems, so that
it does not fully guarantee the conditions for the further
development of derived plants under natural environments.
Inoculation with arbuscular mycorrhizal fungi (AMF) at in vitro
phase could be an alternative to eliminate some of these
problems, by its positive influence on vitroplants obtained
with a greater ability of survival and adaptation. This work
was aimed at evaluating the behaviour of antioxidant enzymes
-peroxidase, polyphenoloxidase and superoxide dismutase- and
vitroplant growth mycorrhized in vitro with two AMF species:
Glomus mosseae and Glomus hoi-like. Thus, potato vitroplants
of Desirée cv. were cultivated in sterile containers with a mixture
of vermiculite and twice the components of M (minimum) culture
media. In this stage, disinfected spores of both AMF were
inoculated, which together with the control without inoculation
constituted the three treatments studied. Once mycorrhized,
vitroplants were transferred to the acclimatization phase and
transplanted to pots. Results indicate G. mosseae is the best
species in both phases; since greater intraradical fungal growth
as well as superior values of aerial fresh mass and leaf number
were observed in plants inoculated with this species.
Differences detected among treatments were biochemically
corroborated with the changes found in enzymatic activities
and mainly in isoenzymatic expression. This suggests the use
of AMF for obtaining micropropagated potato plants
mycorrhized at in vitro stage, which should have a greater
ability for survival and adaptation.
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