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Paper Details

Differential Variability and Stability of Cocoa Clones to Varied Rootstock ages of Patch Budding

Adewale1, B. D., Nduka2, B. A., Adeigbe1, O. O. and Taiwo3 N.

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


The probability that Cocoa genotypes may exhibit different physiological variation when used as scion on the same clonal rootstock of different ages had necessitated the present investigation. Rootstocks were raised from open-pollinated pods of F3Amazon for the ages of one, two and three months. Budwoods from five genotypes were patch budded on the common rootstock of different ages. Growth and development of the budded materials were monitored for four months. The seedling length, girth and the number of leaves per plant of the rootstock at the three ages differed significantly (P ? 0.001). The oldest seedling had the highest significant (P ? 0.05) mean of twelve leaves; 36cm seedling length and 0.51cm stem girth. After budding, DAH, FW and LA exhibited significant (P ? 0.01) genotypic variation. The three ages differed significantly (P ? 0.001) for FW. The only variable with significant (P ? 0.05) clone by age interaction was PDM. Broadsense heritability was quite low (< 23%) in FW, DW and PDM; however, DAS, DAH and LA had 59, 71 and 85% respectively. With respect to PDM, the five clones performed differently in response to the three ages of the root stock. Shukla stability variance and Wricke ecovalence agreed and uniformly identified CRINTc-2 to be most stable genotype across the three ages at budding. The PDM performance of other genotypes is rootstock-age specific. The understanding of the interaction of clones with different rootstock ages in the patch budding or grafting protocols may greatly enhance wider production of cocoa clones.

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