Effects of chitin derivatives and its combination with copper sulfate on the behavior of mycelial growth and sporulation of a monosporic Pyricularia grisea Sacc. isolation
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Abstract
belonging to the National Institute of Agricultural Sciences
(INCA), the effect of some chitin derivatives (chitosan and its
hydrolysate) and its copper combinations on in vitro growth
and sporulation of Pyricularia grisea fungus was studied.
This fungus is the causal agent of Blast, the most important
disease of rice crop in the world, whose conidia are the initial
inoculum of such disease. One 8-mm-diameter mycelial disk
was submerged for 15 minutes in each treatment and three,
five and seven days later, the colony diameter was measured.
Afterwards, conidial number was counted by a counting
chamber and the colony sporulation distribution was observed.
Results showed no significative effect of chitosan and its
hydrolysate at 100 mg.L-1 concentration nor their combination
with copper on Pyricularia grisea mycelial growth; however,
they inhibited pathogen sporulation between 70 and 85 %;
the few sporulation of chitosans was dispersed to colony
periphery, whereas in the control, it was grouped in the center.
These results permit to lead the possibility of using chitosans
at low concentrations in the initial disease inoculum reduction
in the field.
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