International Journal of Plant Physiology and Biochemistry
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Article Number - 4AE124764618


Vol.9(2), pp. 9-21 , May 2017
DOI: 10.5897/IJPPB2017.0262
ISSN: 2141-2162



Full Length Research Paper

Breeding of parental and tolerant hybrids of Theobroma cacao L. to Phytophthora megakarya Bras. and Griff.



Martine Louise Ondobo
  • Martine Louise Ondobo
  • Laboratory of Plant Physiology, Department of Biological Sciences, Higher Teacher’s Training College, P. O. Box 47,Yaounde, Cameroon.
  • Google Scholar
Pierre Onomo Effa
  • Pierre Onomo Effa
  • Laboratory of Plant Physiology, Department of Biological Sciences, Higher Teacher’s Training College, P. O. Box 47,Yaounde, Cameroon.
  • Google Scholar
Jude Ndjaga Manga
  • Jude Ndjaga Manga
  • Laboratory of Plant Physiology, Department of Biological Sciences, Higher Teacher’s Training College, P. O. Box 47,Yaounde, Cameroon.
  • Google Scholar
Jules Christian Kouam Djoko
  • Jules Christian Kouam Djoko
  • Laboratory of Plant Physiology, Department of Biological Sciences, Higher Teacher’s Training College, P. O. Box 47,Yaounde, Cameroon.
  • Google Scholar
Pierre Francois Djocgoue
  • Pierre Francois Djocgoue
  • Laboratory of Plant Physiology, Department of Biological Sciences, Higher Teacher’s Training College, P. O. Box 47,Yaounde, Cameroon.
  • Google Scholar







 Received: 26 February 2017  Accepted: 26 February 2017  Published: 31 May 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


The development of resistant varieties can be done according to a genetic approach. Estimation of genetic parameters for the quantitative traits of cocoa genotypes (Theobroma cacao L.) was made from a 5 × 5 diallel mating design. The objective of this study was to identify tolerant genotypes to black pod disease (BPD) through genetic analyzes. The inoculation of the leaves of parental cocoa genotypes and their offsprings with Phytophthora megakarya was performed in the nursery for two seasons (dry and rainy). Percentage success for crosses made using hand pollination was low (31.22%) and fair for grafting (60.68%). Observations made on necrosis length on the 2nd, 4th and 6th days after inoculation showed increasing sensibility of the clones to BPD in the order SNK 413˂T 79/467˂T 79/501˂SNK 16˂SCA 12. 84.37 and 76.04% of hybrid genotypes exhibited positive heterosis (hybrid vigor) in dry and rainy seasons respectively. Narrow sense (h²) and broad-sense (H²) heritabilities was high in two reciprocal crosses [F30 (h²= 0.699 and H²=0.624) and F70 (h²= 0.601 and H²=0.643)].

Key words: Theobroma cacao, Phytophthora megakarya, tolerant, heterosis, heritability.

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APA Ondobo, M. L., Effa, P. O., Manga, J. N., Djoko, J. C. K., & Djocgoue, P. F. (2017). Breeding of parental and tolerant hybrids of Theobroma cacao L. to Phytophthora megakarya Bras. and Griff.. International Journal of Plant Physiology and Biochemistry, 9(2), 9-21.
Chicago Martine Louise Ondobo, Pierre Onomo Effa, Jude Ndjaga Manga, Jules Christian Kouam Djoko, and Pierre François Djocgoue,. "Breeding of parental and tolerant hybrids of Theobroma cacao L. to Phytophthora megakarya Bras. and Griff.." International Journal of Plant Physiology and Biochemistry 9, no. 2 (2017): 9-21.
MLA Martine Louise Ondobo, et al. "Breeding of parental and tolerant hybrids of Theobroma cacao L. to Phytophthora megakarya Bras. and Griff.." International Journal of Plant Physiology and Biochemistry 9.2 (2017): 9-21.
   
DOI 10.5897/IJPPB2017.0262
URL http://academicjournals.org/journal/IJPPB/article-abstract/4AE124764618

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