Genetic parameters, heritability and correlation coefficient values among some characters of jerusalem artichoke (Helianthus tuberosus L.) [electronic resource].

Includes references.

Two jerusalem artichoke (Helianthus tuberosus L.)cultivars; genotypes, were grown under two different locations; i.e., Alexandria governorate and south El-tahrir region. Planting conducted on May for the two years 2010 and 2011 of the study. The investigation was done to determine some genetic parameters affecting jerusalem artichoke breeding programs. Phenotypic (p) and genotypic (g) variability and their respective coefficient of variations, genetic advance, and broad-sense heritability, correlation coefficients among all pairs of some important jerusalem artichoke characters were studied .The obtained results showed that most of the studied characters were highly affected by the environmental factors especially from one location to the other. The genotypic and phenotypic coefficients of variations had mostly equal values for most studied traits. This result confirmed that these traits were seriously affected by the changes in the environmental factors. This means that these environmental factors would show negative effects for selection during the cycles of the breeding program. The characters number of tubers / plant, average tuber weight, total tuber yield (ton/fed.), potassium and nitrogen percentages possessed moderate high heritability values (in broad-sense). Accordingly, it might be stated that phenotypic selection for these characters would be reasonably effective.

Summary in Arabic.

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