01519naa a2200157 a 450000100080000000500110000800800410001910000190006024500890007926000090016852010590017765000260123665000210126270000170128377300610130012795762025-01-24       1989    bl uuuu     u00u1 u    #d1 aROBERDS, J. H.  aPopulation selection to maximize in a environmental gradient.h[electronic resource]  c1989  aA theory for determining optimum planting and breeding zones is described. The theory is based on a model consisting of Gaussian response functions for traits that vary in a gradient for a single environmental variable. Environments are assumed to be normally distributed with known mean and variance. Methods are presented for determining parameters of response functions that maximize the expected value for such a trait when two, three and four populations are selected forbreeding or as sources of propagules. Expected value is maximized only when the populations selected have response functions symmetrically arrayed about the mean of the environmental variable. Maximum expected value was shown to increase with increasing number of selected populations at a rate that depends upon the ratio of homostasis to environmental variability. The methods presented are illustrated with data on performance of Scots pine provenances in Sweden. Key words: Response function - Genotype-environment interaction- Seed transfer zones Breeding zones- Scots pine  aInteração Genética  aPinus Sylvestris1 aNAMKOONG, G.  tTheoretical and Applied Geneticsgv.77, p.128-134, 1989.