Resistance of Gamma Irradiated Lakatan mutant lines against black sigatoka disease (Mycosphaerella fijiensis Morelet) under natural field condition [manuscript]
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Date
2017
Authors
Reuel O. Pablo
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Abstract
The influence of irradiation and weather parameters on the expression of resistance and / or susceptibility to black Sigatoka (Mycosphaerella fijiensis M.) were examined on several irradiated Lakatan lines under natural field infections. The Lakatan lines utilized in this study were lakatan line A, line B, line C, line D and line E which differed in resistance and susceptibility to the black Sigatoka pathogen. Lakatan lines B and D exhibited partial resistance characterized by impeded lesion development, lower infection index, infection efficiency and disease efficiency as compared to control. For the other Lakatan lines, expression of susceptibility was indicated by an accelerated disease progresion from lesion development to an overall increase of the different disease parameters measured for black Sigatoka.
Correlation analysis showed significant relationship between weather variables and formation of streaks on cigar leaf stage B of the different Lakatan lines. Of the three weather variables, rainfall, temperature and relative humidity were positively correlated in the development of the streaks.