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Asian Journal of Plant Pathology
  Year: 2009 | Volume: 3 | Issue: 4 | Page No.: 106-118
 
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Resistance to Phytophthora palmivora (Butler) Butler Assessed on Leaf Discs of Cacao (Theobroma cacao L.) Hybrid Trees

M.J. Akaza, J.A.K. N`Goran, S-P.A. N`Guetta, B.I. Kebe, G.M. Tahi and A. Sangare

Abstract:
To select resistant cacao genotypes to Phytophthora palmivora and better understand the genetic determinism of resistance to this pathogen, the individual resistance of 133 and 105 two ways cocoa hybrids trees of two related progenies, F1 and F7, respectively, was evaluated by leaf discs test. The F1 and F7 derived from crosses (P7 x ICS100) x C1 (P7 x ICS95) x C1, respectively. P7 is a resistant heterozygous Upper Amazon Forastero clone; ICS100 and ICS95 are less susceptible genetically close Trinitario clones. The common male parent, C1, is a completely homozygous susceptible Lower Amazon Forastero clone Amelonado type. Three series of inoculations were conducted per family and one-hundred and twenty leaf discs taken from each tree were inoculated. The results showed additivity of transmission of resistance to P. palmivora, the presence of a transgression for this character and the involvement of several recessive alleles in resistance to Phytophthora. Significant differences in levels of resistance were observed between the genotypes of each progeny. The average levels of resistance of F1 and F7 are intermediate between those of both resistant controls SCA6 and PA150 and that of NA79, the susceptible control. In the F1 and F7, respectively, 24 and 05 cocoa trees were more resistant than SCA6 and PA150. These trees may be selected and may serve as potential new genitor clones in Phytophthora sp., genetic resistance breeding programs. They may also provide budwoods for replacements in fields.
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How to cite this article:

M.J. Akaza, J.A.K. N`Goran, S-P.A. N`Guetta, B.I. Kebe, G.M. Tahi and A. Sangare, 2009. Resistance to Phytophthora palmivora (Butler) Butler Assessed on Leaf Discs of Cacao (Theobroma cacao L.) Hybrid Trees. Asian Journal of Plant Pathology, 3: 106-118.

URL: https://scialert.net/abstract/?doi=ajppaj.2009.106.118

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