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Genetic analysis of quantitative characters in upland cotton gossypium hirsutum i. estimation of genic effects on 17 agronomic characters from generation means



Genetic analysis of quantitative characters in upland cotton gossypium hirsutum i. estimation of genic effects on 17 agronomic characters from generation means



Acta Genetica Sinica 12(5): 344-349



Genic effects on 17 characters of Upland cotton, of which 10 characters are connnected with plant-type and the rest with yield and quality, were estimated from means and mean variances for 11 sets, each including P1, P2, F1, F2, B1 and B2 families. The results show that besides additive and dominant effects, epistatic effects are non-negligible for the inheritance of plant beight, internode length of the main stem, the 5th, 10th and 15th fruit branches as well as staple characters. The additive-dominance model is adequate for the characters of angle of both the 1st and 10th fruit branches with the main stem. On the other hand, the additive component is principally responsible for the inheritance of 9 characters: the internode length of the 1st fruit branch, angles of the 5th and 15th fruit branches with the main stem, number of bolls per plant, weight of seed cotton per boll, lint percentage, yield of seed cotton harvested before frosting and seed cotton per plant, and lint yield per plant as well. It follows that in general, the inheritance of characters for planttype does not seem simpler than that for yield. In our research, some approaches for estimating genic effects proposed by Mather and Jinks (1982) have been improved. They mainly include: (1) only those combinations, the difference between whose biparent means is significant, were analysed; (2) the statistical method that the effects non-significantly different from zero were eliminated one by one was applied, so as to evaluate the genetic model precisely; (3) in order to evaluate a general model of each character, an analysis pooled over combinations concerned was practised. Thus, the statistical procedure may well be in agreement with the principle of genetics.

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Accession: 005511320

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Related references

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