The measurement and significance of genotype-environment interactions in grasses

Genotype-environmental interactions in Schizophyllum commune I. Analysis and character

“…The example given by these authors is, in fact, taken from the present set of data. The findings, though, agree with those in previous studies encompassing a wide variety of different characters and organisms and in which the performances of some or all genotypes in a set are regressed on to non-independent environmental values (Finlay and Wilkinson, 1963;Eberhart and Russell, 1966;Perkins and Jinks, 1968;Breese, 1969;Connolly, personal communication;Westerman, 1971 a, b). This agreement is of considerable practical importance.…”

“…The definitions of the d and gij parameters in this model (No. 1 in table 1) have been modified, as suggested by Connolly (personal communication), to allow for heterozygosity in the genotypes (see also Breese, 1969).…”

“…These changes, observable as genotype x environment interactions in a biometrical analysis, have long been recognised as an important source of phenotypic variation (Immer, Hayes and Powers, 1934;Yates and Cochran, 1938;Mather, 1949). Little is known of the inheritance and physiology of these changes, but it has been found empirically that a linear relation frequently exists between phenotype and environment when the latter is measured by its effect on the character under study (Finlay and Wilkinson, 1963;Eberhart and Russell, 1966;Perkins and Jinks, 1968;Breese, 1969). This linear relation usually accounts for most of the variation over environments of a genotype and as a result it is possible to predict its phenotype under further related environmental conditions (Breese, 1969;Jinks and Perkins, 1970).…”

“…Little is known of the inheritance and physiology of these changes, but it has been found empirically that a linear relation frequently exists between phenotype and environment when the latter is measured by its effect on the character under study (Finlay and Wilkinson, 1963;Eberhart and Russell, 1966;Perkins and Jinks, 1968;Breese, 1969). This linear relation usually accounts for most of the variation over environments of a genotype and as a result it is possible to predict its phenotype under further related environmental conditions (Breese, 1969;Jinks and Perkins, 1970). In addition, this regression of phenotype against environment provides two simple measures -the regression coefficient and the deviations from regression mean square -of the sensitivity of a genotype to environmental change.…”

An investigation of genotype-environment interactions for rate of ear emergence in spring barley

“…A number of workers including Jinks and Mather (1955), Jinks and Stevens (1959), Bucio Alanis and Hill (1966), Bucio Alanis, Perkins and Jinks (1969), Jinks and Perkins (1969) and Breese (1969) have investigated the relative sensitivity of additive, dominance and epistatic components and they have found situations in which the dominance component has been more sensitive, equally sensitive and less sensitive than the additive component. This investigation confirms that both the additive and dominance components interact with the environment.…”