Jinks L J, Connolly V
Heredity (Edinb). 1975 Jun;34(3):401-6. doi: 10.1038/hdy.1975.49.
The parents chosen to continue 10 independent selection lines of Schizophyllum commune over eight successive generations of selection, along with unselected controls, have been retrospectively examined for their response to growth at 15 degrees, 20 degrees, 25 degrees, 30 degrees and 35 degrees C. The regression of rate of growth on temperature was essentially linear over the range 15 degrees to 30 degrees C for all lines in all generations as was also the regression of rate of growth on various biological assessments of the environments over the whole temperature range. Either regression, therefore, provided linear regression coefficients which adequately accounted for the relative sensitivities of the lines to temperature in each generation of selection. These measures of environmental sensitivity confirmed our earlier report that selection for high mean performance in a good environment or for low mean performance in a poor environment leads to selections that are more sensitive to environmental variation than selections for high mean performance in a poor environment or for low mean performance in a good environment. These differences in sensitivity emerge as correlated responses during selection and the magnitude of these correlated responses is higher in the good environment than in the poor environment irrespective of the direction of selection. The environmental sensitivity of selection lines can be modified in either direction as required by either selecting for sensitivity simultaneously with the selection for mean performance or by selecting for mean performance in an above or below average environment. The quality of environments in which artificial selection is usually carried out is likely to have led to high selections with maximum environmental sensitivity and low selections with minimum sensitivity.
我们回顾性地研究了被选来连续八代培育10个裂褶菌独立选择品系的亲本，以及未被选择的对照品系，观察它们在15摄氏度、20摄氏度、25摄氏度、30摄氏度和35摄氏度下的生长反应。在15摄氏度至30摄氏度的范围内，所有品系在所有世代中，生长速率对温度的回归基本上都是线性的，在整个温度范围内，生长速率对环境的各种生物学评估的回归也是如此。因此，这两种回归都提供了线性回归系数，这些系数充分说明了各选择世代中品系对温度的相对敏感性。这些环境敏感性的度量证实了我们早期的报告，即在良好环境中选择高平均表现或在恶劣环境中选择低平均表现，会导致所选品系比在恶劣环境中选择高平均表现或在良好环境中选择低平均表现的品系对环境变化更敏感。这些敏感性差异在选择过程中作为相关反应出现，并且无论选择方向如何，这些相关反应的幅度在良好环境中都高于恶劣环境。通过在选择平均表现的同时选择敏感性，或者在高于或低于平均水平的环境中选择平均表现，可以根据需要在任一方向上改变选择品系的环境敏感性。通常进行人工选择的环境质量可能导致了具有最大环境敏感性的高选择品系和具有最小敏感性的低选择品系。
