Resumo

ESPINOSA, Natalia  e  LIGARRETO, Gustavo Adolfo. Evaluating combinatory ability and heterosis of seven parental Pisum sativum L. pea lines. Agron. colomb. [online]. 2005, vol.23, n.2, pp.197-206. ISSN 0120-9965.

There is a lack of information in Colombia about the type of genetic control that governs the precociousness, yield and components of peas. This study was aimed at evaluating eleven agronomic variables when combinatory ability and heterosis in four lines of pea and three commercial varieties. A complete diallel design (Griffing method 1, model 1) was developed with seven materials in the conditions existing on the Sabana de Bogotá. Variance was estimated and estimated values were used for calculating general combining ability (GCA) and specific combining ability (SCA) and heterosis cf mid-parent value (MPV) better parent value (BPV). GCA was highly significant for eight of the characteristics and SCA was significant for first flower node, pod length, number of seeds per pod and the weight of 100 seeds. The 'Pequinegra', 'Santa Isabel' and 'ICA Tominé' varieties were the best parents due to their high GCA in many of the evaluated characteristics. 'Pequinegra' presented highly significant reciprocal effects for characteristics related to precociousness. The F1 hybrid had better than average behaviour when evaluating heterosis cf mid-parent value for five yield components. Nevertheless, only three F1 were earlier than the better parent. Negative values were found for HMP suggesting precociousness for the half of the hybrids evaluated. There was important association between pod size and the weight of 100 seeds.

Palavras-chave : diallel design; precociousness; yield; genetic control; hybrid vigour.

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