Osmotic stress effect on in vitro growth, pathogenicity and osmolyte production in Macrophomina phaseolina
DOI:
https://doi.org/10.33885/sf.2014.3.1123Keywords:
Phaseolus vulgaris, HPLC analysis, arabitol, fructose, glycerol, glucose, charcoal rotAbstract
The fungus Maaophomina phaseolina causes charcoal rot in common bean
(l'haseolus vu/IJBTis) and although it tolerates osmotic stress the mechanisms of tolerance remain
unknown. In this worit under in vitro conditions it was determined the growth of six M.
phaseolina isolates under variable NaCI (PDA with 0, 500 and 1000 mM); pathogenicity in four
bean cultivars (Azufrado Tapatlo, BAT 477, Pinto Ul-114, SEQ12) growing; and the
concentrations of glycerol, arabitol, D-fructose and D-glucose concentrations of each fungal
isolate growing under 0, 250, and 500 mM Naa. NaCI (500mM) reduced M. phaseolina growth
up 50%. Isolates from Rfo Bravo, Tamaulipas were the most aggressive. The growth of M.
phaseolina was negatively associated with osmolyte concentrations under no-NaO conditions
but positively with D-glucose concentration under 500 mM NaCI. Pathogenicity was negatively
associated with osmolyte production. Osmotic stress induced de IIOVD synthesis of osmolytes in
M. phaseolina but reduced its aggressiveness in beans
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