Estimation of genetic parameters for in vitro traits in wheat immature embryo cultures involving high X low regeneration capacity genotypes

• Published in: Euphytica 1996, Vol.87 (2), p.119-125
• Main Author: Barakat, M.N. (King Saud Univ., Riyadh (Saudi Arabia). Coll. of Agriculture and Veterinary Medicine, Dept. of Agronomy and Range Science)
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Biotechnology; CULTIVO DE EMBRIONES; CULTURE D'EMBRYON; EMBRYO CULTURE; Fundamental and applied biological sciences. Psychology; GENETIC PARAMETERS; Genetics and breeding of economic plants; Haploidy, in vitro culture applications, somatic hybrids; HEREDABILIDAD; HERITABILITE; HERITABILITY; PARAMETRE GENETIQUE; PARAMETROS GENETICOS; Plant breeding: fundamental aspects and methodology; TRITICUM AESTIVUM; VARIEDADES; VARIETE; VARIETIES
• ISSN: 0014-2336; 1573-5060
• DOI: 10.1007/BF00021884

Estimates of gene actions were obtained for five in vitro traits of immature wheat (Triticum aestivum L.) embryo cultures from a cross of two wheat cultivars and the resulting reciprocal, F sub(1), F sub(2) and backcross populations. The contribution of additive gene effects to in vitro traits was not as important as the dominance gene effects. Epistatic gene effects were relatively more important than either additive or dominance gene effects. Of the individual types of digenic epistatic effects, the dominance x dominance estimates were relatively larger in magnitude for all in vitro culture traits measured. The maternal effect played a minor role in the inheritance of the in vitro studied traits since the difference among the reciprocal values was not significant. It is shown from the generation mean method that epistasis played a major role in the inheritance of most of the traits under study. The negative values of additive and dominance genetic variance were estimates of zero. Heritability estimates, in broad sense, were relatively high for the in vitro studied traits. In some cases, heritability estimates in broad and narrow senses are almost equal since the estimation of dominance genetic variance led to negative values. According to the results of the gene effects, dominance and epistasis were important for the shoot formation trait. Selection would be effective among the isolated genotypes on individual basis.