Relationship between the drying of the sclerotia of Phymatotrichopsis omnivora and Its survival
DOI:
https://doi.org/10.33885/sf.2010.3.1071Keywords:
soil fungi plant pathogens, melaninAbstract
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
-1 buried in flooded soil and supplemented with glucose at 1 mg g (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 R 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
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