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International Journal of Plant Breeding and Genetics
  Year: 2012 | Volume: 6 | Issue: 2 | Page No.: 54-68
DOI: 10.3923/ijpbg.2012.54.68
 
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Morpho-physiological Mechanisms of Resistance to Black Pod Disease in Cacao (Theobroma cacao L.)
D. Nyadanu, R. Akromah, B. Adomako, C. Kwoseh, S.T. Lowor, H. Dzahini-Obiatey, A.Y. Akrofi, F. Owusu Ansah and M.K. Assuah

Abstract:
Morpho-physiological characteristics of 12 genetically diverse cocoa genotypes with various levels of resistance were examined to determine which features were associated with resistance. The 12 cocoa genotypes were evaluated by leaf discs and detached pod inoculations for resistance to P. palmivora and P. megakarya. Pod husk thickness and epicuticular waxes on abaxial and adaxial surfaces of leaf and on cocoa pod surfaces were significantly and negatively correlated with resistance to black pod disease. Percentage moisture content was positively associated with resistance to black pod disease. Epicuticular wax on pod husk was significantly correlated with penetration resistance but however was not significant with post-penetration resistance suggesting its role in restricting penetration of the fungus. Principal Component Analysis (PCA) shows that the first two components contribute to explain 97.02% (PC1 = 87.87%, PC2 = 9.29%) of the total variation of morpho-physiological traits in cocoa. Amount of cuticular wax on pod surface, percentage moisture content of pod husk and leaf were the major contributors of total variation of morpho-physiological factors evaluated. Multiple linear regression analysis indicated that morpho-physiological traits explained 99.2, 91.2 and 81.3% of the variation in pod lesion number, pod lesion size and leaf disc score, respectively. This suggests that amount of wax on pod and abaxial surface of leaf, thickness of exocarp at the ridge and percentage moisture content could be used as marker traits to select for resistance to black pod disease.
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How to cite this article:

D. Nyadanu, R. Akromah, B. Adomako, C. Kwoseh, S.T. Lowor, H. Dzahini-Obiatey, A.Y. Akrofi, F. Owusu Ansah and M.K. Assuah, 2012. Morpho-physiological Mechanisms of Resistance to Black Pod Disease in Cacao (Theobroma cacao L.). International Journal of Plant Breeding and Genetics, 6: 54-68.

DOI: 10.3923/ijpbg.2012.54.68

URL: https://scialert.net/abstract/?doi=ijpbg.2012.54.68

 
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