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Relationship between Grain Yield and Environmental Variability in Oats (Avena sp.)¹

The yield of 94 populations consisting of 89 homozygous and homogeneous lines and five recommended varieties was tested for 6 years at Gainesville, Fla. The r values between the yield of the 94 populations and their variability in yield over the 6 years were as follows: 1964 = –.24*; 1965 = –.79**; 1966 = .03; 1967 = –.39**; 1968 = –.47**; 1969 = –.37**; and six year mean = –.60**. Selection for high yield generally resulted in selecting populations with low environmental variability.

Key Words: Homeostasis • Selection response • Genotype-environment interactions

² Professor, University of Florida, Gainesville 32601. Sincere appreciation is expressed to H. S. Anspach for expert technical assistance.

Received for publication October 14, 1971.