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Quantitative genetic studies in flue cured tobacco nicotiana tabacum 2. certain physical and chemical characters



Quantitative genetic studies in flue cured tobacco nicotiana tabacum 2. certain physical and chemical characters



Canadian Journal of Genetics and Cytology 27(1): 92-100



Genetic analyses of flue-cured tobacco leaf physical characteristics (percent lamina, lamina weight, and filling value) and chemical characteristics (percent total alkaloids, reducing sugars, N, ash and cellulose) were conducted on a 5 parent diallel set (excluding reciprocals) evaluated at the Delhi Research Station in a randomized block design over a 2-yr period. The ANOVA indicated that there was variance associated with a genetic source for all characteristics except filling value. Griffing's analysis for variances owing to general and specific combining abilities suggested additive genetic variance as the main source of genetic variation. Variances owing to specific combining ability for all traits were exceeded by the variance of the estimates indicating dominance to be of no major consequence in the expression of these physical and chemical traits. Total alkaloids and percent N expressed maximum heritability, and Wr and Vr graphs supported the conclusions. Parental diversity was evident from the scatter of array points and graphic analysis also indicated lack of dominance. Examination of pleiotropic effects revealed that traits related positively with alkaloids and N were negatively correlated with carbohydrate fractions such as reducing sugars and cellulose.

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Accession: 006244033

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