ABSTRACT


P.C. Parodi1, F.L. Patterson2y W.E. Nyquist2
 
The soft red winter wheat genotypes 'Vermillion', 'Séneca', 'Knox 62', 'Benhur','Arthur' and Purdue 5215 were crossed in a diallel system to estimate hybrid vigorand gene action in the F1and F2 generations subjected to emergence under stress conditions.Parents, F1 and F2 were exposed to 2 levels of temperature; 3.5 and 8.5°C., and2 levels of moisture, 3 and 5 atmospheres of tension, to determine rate of emergence andpercent emergence. F1 and F2generation hybrids emerged faster and better than mid-parentsand better parents. Additive, and additive and non-additive effects controlled theexpression of these 2 characters. Overdominance, and a degree of complementary interactionwere detected. Narrow sense heritabilities for emergence rate were low in F1,and high in F2; the estimates were intermediate and consistent for percent emergencein both generations.
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1Anteriormente Rockefeller Fellow, actualmente IngenieroAgrónomo, Ph. D., Proyecto Trigo, Estación Experimental, La Platina, Instituto de Investigaciones Agropecuarias,casilla 5427, Santiago, Chile. Profesor Cátedra investigación Agrícola, Facultad de Agronomía, Universidad Católicade Valparaíso.
2Profesores de Agronomía. Departamento de Agronomía,Purdue University, respectivamente.