ABSTRACT


Patricio C. Parodi1, Carol Müller T.2, Héctor Wulf M.3 y Denise Granger Z.3
 
Six spring wheat (Triticum aestivum L.) genotypes were hand-crossed in a diallel system. the following quality components were analyzed to evaluate industrial and nutritional quality in the F1 generation: micro-Pelshenke time; micro-sedimentation value; water absorption capacity; loaf volume; crumb texture, and protein content.
Genotype 'Collafén' exhibited its potential as a hybrid parent, producing the bestF1 progenies within this group. Percent heterosis and heterobeltiosis were on theaverage negative for micro-Pelshenke time, -14.51 and -27.83%, respectively; positivefor micro-sedimentation value, 19.54 and 7.06%; positive for water absorptioncapacity, 5.12 and 3.64%; negative for loaf volume, -7.76 and -12.22%, for crumbtexture percent heterosis was low and positive 0.70% while percent heterobeltiosiswas low and negative, -0.19%; protein content produced negative heterosis andheterobeltiosis averages, -4.15 and -6.19%, respectively. These results emphasize the F1 hybrid generation tendency to be uncapable of consistently outperfotming the parental generation quality va1ues.
The combining ability analyses showed that excepting micro-Pelshenke time, aditivegene action was as important as non-additive gene action in the expressionof these character. Additive gene action appeared to be the most important componentin the expression of micro-Pelshenke time.
Jinks and Hayman's graphic analysis showed total dominance for micro-Pelshenketime and water absorption capacity; partial dominance for micro-sedimentationvalue and crumb texture; and overdominance for loaf volume and protein content.Interpretation of the micro-sedimentation, water absorption and crumb texturegraphs, however, is dubious since the slope of their respective regression lines wassignificantly different from unity slope.Narrow sense heritability was high only for mitro-Pelshenke time, 0.902 ± 0.246,in agreement with the interpretation of the combining ability apalysis results.
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1Ing. Agr., Ph. D., Proyecto Cereales, Instituto de Investigaciones Agropecuarias (INIA). Actualmente en la Universidad Católica de Chile. Casilla 114-D, Santiago, Chile.
2Ing. Agr., Area de Fitotecnia, Facultad de Agronomía, Universidad de Chile. Casilla 1004, Santiago, Chile.
3Ings. Agrs., Proyecto Cereales, Laboratorio de Farinología, Instituto de Investigaciones Agropecuarias (INIA), Casilla 5427, Santiago, Chile.