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ARTÍCULO
TITULO

Effect of one generation selection for productive characters in a globe artichoke population (Cynara scolymus).

V.P. CRAVERO    
E.L. COINTRY    
F.S. LOPEZ ANIDO    
P.D. ASPRELLI    
S.M. GARCIA    

Resumen

Selectionresponse for productive characters in an open pollinated population of globe artichoke and clones derivedof both generations (C0 and C1) were evaluated. By means of multivariate analysis, elite plants of C0 wereselected and intercrossed to conform C1. Selected plants of C0 and C1 were clonned and planted in arandomized complete block design with three replicates. Selection for marketable yield (42%) was relatedwith increased total yield, head number (34%) and quality, but in turn associated to a slight reduction inmean head weight and mean bottom weight. Clones of C1 showed an increment of 25% in total andmarketable yield over those of C0. The selection gains for total marketable yield and head number arerelated to an additive gene action involved in the expression of these traits, however, for mean head weightthe negative selection response is associated to non-additive gene effects. En una población obtenida por polinización libreentre distintos clones se evaluó la respuesta paracaracteres productivos luego de un ciclo de seleccióncomparándose el comportamiento declones de alcachofa (Cynara scolymus L.), derivadosde las poblaciones de ciclos cero (C0) y uno(C1). Los individuos de C1 se generaron por polinizaciónlibre de plantas de C0 seleccionadas poranálisis multivariado, estimándose la ganancia porselección. Las plantas selectas de ambos ciclosfueron clonadas e implantadas en un diseño debloques completos aleatorizados con tres repeticiones.Para el rendimiento de mercado se observóuna ganancia del 42% debido a un mayor rendimientototal, dado por un 34% de aumento delnúmero de capítulos y mejor calidad, acompañadode una leve disminución del peso y del peso de fondo. Los clones de C1 manifestaron un incrementodel 25% en el rendimiento total y demercado con respecto a aquellos obtenidos de C0.La ganancia por selección para rendimiento, rendimientode mercado y número de capítulos sedebería a la presencia, principalmente, de accionesaditivas aunque para peso del capítulo principaloperarían efectos génicos no aditivos.

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