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Effect of Chitosan on in vitro development and morphology of two isolates of Colletotrichum gloeosporioides (Penz.) Penz. and Sacc.
Silvia Bautista Baños, Mónica Hernández López, Ana Niurka Hernández Lauzardo, José Luis Trejo Espino, Mayra Karina Bautista Cerón, Gloria Elena Melo Giorgana;
Revista Mexicana de Fitopatología 2005 23(1)
Resumen
Inglés Español
Colletotrichum gloeosporioides is the casual agent of the disease known as anthracnose. This fungus infects a wide range of hosts during the pre and postharvest stages of various horticultural commodities. To date, chitosan a natural biodegradable compound, chitin derivative, has been tested in the control of pathogenic microorganisms. In this research, the fungicidal or fungistatic potential of chitosan with different degrees of polymerization (low, medium and high molecular weight) and concentrations (0.5, 1.0, 1.5, and 2.0%) was evaluated on the in vitro development of two isolates of C. gloeosporioides obtained from infected papaya fruit from the states of Veracruz and Guerrero, Mexico. The effect of chitosan on conidial morphology was also observed by image analysis. Results showed no difference in the fungicidal pattern among the three different types of chitosan applied. There was a higher fungicidal effect as chitosan concentration increased. The fungicidal potential of chitosan varied according to the treated isolate. Overall, sporulation was the variable most affected by this compound for both isolates. A hundred percent germination was observed when conidia were re-incubated on potato-dextrose-agar disks and a significant inhibition was obtained when re-incubated directly on chitosan solutions. The area of the chitosan-treated conidia was affected as well. In future studies, it is proposed to carry out more in depth research including the use of electronic and scanning microscopy, tests with higher concentrations of chitosan and the fungicidal evaluation of chitosan prepared by different methodologies.

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Universidad Autónoma del Estado de México
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