Resumo

SAMANIEGO GAXIOLA, José Alfredo; ORDONEZ MELENDEZ, Hugo Joaquín; PEDROZA SANDOVAL, Aurelio  e  CUETO-WONG, Cristina. Relationship between the drying of the sclerotia of Phymatotrichopsis omnivora and its survival. Rev. Mex. Mic [online]. 2010, vol.32, pp.49-58. ISSN 0187-3180.

Phymatotrichopsis omnivora is an important plant pathogen, which was reproduced in the laboratory, and its sclerotia were separated by type: large, medium, small and albinos. All type of sclerotia were dried up to 60 minutes or after being dried, were applied stress treatments: a) none (control), b) sclerotia buried in moist sandy soil (25% wt /wt), c) sclerotia submerged four hours in sodium hypochlorite solution at 0.3%, d) sclerotia buried in flooded soil and supplemented with glucose at 1mg g^-1 (glucose / soil). The initial weight, weight loss (after dried) and the survival of all type of sclerotia were statistically different (p = 0.001). The survival of sclerotia was similar in treatment of stress and where they only were dried, this suggests that the sclerotia are die on drying before applying the stress treatments. The proportion and rate of weight loss of dried sclerotia was inverse to its 2 size. Each type of sclerotia lost weight correlated with survival R² from 0.60 to 0.94. Albino sclerotia that were dried died less than other type of sclerotia. This work indicates that the sclerotia of P. omnivora dried, quickly die.

Palavras-chave : Soil fungi plant pathogens; melanin.