Abstract

ESPITIA CAMACHO, Miguel Mariano; VALLEJO CABRERA, Franco Alirio  and  BAENA GARCIA, Diosdado. HETEROTIC EFFECTS AND COMBINING ABILITY FOR YIELD PER PLANT IN Cucurbita moschata DUCH. Ex Poir. Rev. Fac. Nac. Agron. Medellín [online]. 2006, vol.59, n.1, pp.3105-3121. ISSN 0304-2847.

The purpose of this study was to estimate the heterotic effects, general combining ability (GCA), and specific (SCA) for fruit yield per plant (RFP) in two diallelic [one among five cross pollinated varieties (VAR) and the other among five self-pollinated lines S₁ (LS₁), derived from these], according to the methodologies designed by Gardner y Eberhart (GyE: 1966: Analysis II) and Hallauer and Miranda (HyM: 1981) using a complete randomized design with five replicates in Candelaria (Valle del Cauca, Colombia). The differences between genotypes observed in the diallelic of LS₁ by GyE, were explained by the effects of varieties (v_j: p (h_jj': p < 0,01), and in the diallelic of VAR only by the effects of varieties (v_j : p < 0,01). The mean heterosis (: p < 0,01) and specific heterosis (S_jj': p < 0,05) explained the differences for h_jj in the diallelic of LS₁. According to the methodology of HyM, the additive (GCA: p < 0,01) and non additive genic action (SCA: p < 0,05) controlled the expression of RFP in the diallele of LS₁ with greater importance of the GCA. In the diallele of VAR, only the GCA (p < 0,01) explained such control. The genotypes Bolo Verde (RFP = 17,8 kg/plant; v_j = 3,34**; g_i = 1,73*) and Soler (PFP = 17 kg/plant; v_j = 2,89*; g_i = 175*) are the recommended genotypes to exploit the additives effects and the hybrid LA34 x LSO (RFP = 26 kg/plant; S_jj'= 3,55**) to exploit the additive and non additive effects through reciprocal recurrent selection.

Keywords : Cucurtita moschata; heterotic effects; combining ability.

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