Genotype-environmental interactions in Schizophyllum commune III. The relationship between mean expression and sensitivity to change in environment

Abstract

SUMMARYThe relationship between the genetical systems determining mean expression and sensitivity to change in environment has been examined for dikaryotic growth rate in Schizophyllum commune by examining the correlation between these aspects of phenotype in a population in which both are segregating simultaneously. For a collection of environments of diverse composition a positive association was found between mean expression and linear sensitivity.The correlation was low, however, and approximately 50 per Cent, of the variation in those two aspects was independent. In a more uniform set of environments the association disappeared, demonstrating firstly that different genetical systems act in different environments, and secondly that at least in certain circumstances mean expression and linear sensitivity are determined by separate gene systems. The association between mean expression and non-linear sensitivity also depended on the particular set of environments considered. It is concluded that the relationship between mean expression and sensitivity is markedly influenced by the environments involved, and that each combination of genotypes, environments and character should be treated as a separate case.

Distinct genetic architectures for phenotype means and plasticities in Zea mays

“…A FWR slope of one denotes a RIL exhibiting the population average response to the environment, while a slope of zero denotes a RIL exhibiting no response to the environment. The residual variance for each RIL serves as a measure of model fit with larger residual variances indicating poor fits to the linear model due to environmental variables that were not modeled, non-linear responses to the environment, or lack of genetic basis for the environmental response 27,28 . Genetic correlations between the mean phenotype values and plasticities for each phenotype are moderate to strong for many of the phenotypes (Supplementary Figure 1).…”

“…The estimate of (1 + b i ) was recorded as a measure of a RIL’s linear response to the environment 24 . The variance of the ϵ ij ’s for each RIL was recorded as a measure of the non-linearity in that RIL’s response to the environment 27,28 . These residual variances were log-transformed for further analysis.…”

Genotype × Environment Interaction and Stability Analysis in Mungbean

“…On the contrary, E1 showed highly negative value for all the traits. In spite of many objections to this environmental index (Tai, 1971;Hardwick and Wood, 1972), it has been shown that, generally interpretation of a set of data dependent little on whether independent or dependent values were used for the index in calculating the regression slopes (Perkins and Jinks, 1973;Fripp and Caten, 1973).…”

Some aspects of adaptation and adaptability of barley in European conditions.

“…When carrying out analyses with different models for adaptation or interaction some points seem too frequently disregarded, such as the fact that in such a twoway table an interaction effect is wholly relative, being conditional to the whole ar ray of sites and varieties (Fripp & Caten, 1973). Yet one tends to calculate varietal stability parameters: these might be completely different if other varieties and sites were considered.…”