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2021, Number 2

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Biotecnol Apl 2021; 38 (2)

In vitro effect of a chitosan on two strains of Bipolaris oryzae isolated in Mexico and Cuba

Rodríguez PAT, Plascencia JM, Bautista BS, Ventura ZE, Cortez RMO, Ramírez AMÁ

Language: Spanish
References: 23
Page: 2201-2205
PDF size: 1145.95 Kb.


ABSTRACT

Brown spot (Bipolaris oryzae) is one of the diseases affecting rice cultivation (Oryza sativa L.) and the use of natural products such as chitosan to its control is currently being investigated. This compound shows a high antifungal activity, which depends on its molecular mass, degree of acetylation, concentration, among others. In this work, it was evaluated the in vitro effect of a chitosan of medium molecular mass at three concentrations (1, 3 and 4 g/L) on the growth of two strains of the fungus B. oryzae. It was observed that the higher the concentration, the greater the percentage of inhibition of radial growth and the affectation of the biopolymer on the hyphae. The concentration of 4 g/L showed the best results. Damage to the hyphae was corroborated by scanning electron microscopy at 3 mg/L chitosan concentration in both strains.


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