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Hot pepper (Capsicum annuum L) is widespread and cultivated for its pungent fruits worldwide and used for fresh consumption or dry powder. The biological material was composed of six hot pepper genotypes, genetically and ecologically differentiated, used as parents and 15 hybrids of half-diallel crosses between these parents. The aim of this research was to estimate the level of heterosis and breeding potential for plant yield of 15 F1 hybrids between six hot pepper parents, in order to identify and select promising crosses for improvement programs of hot pepper. In terms of heterobeltiosis, only the crosses Cs3 x Cayenne (122.81%) and Cs3 x Cs2 (5.02%) showed a higher plant yield than the best parent, with increases between 23.6 and 513 g. For 63.5% of the crosses the inheritance of plant yield was under the control of incomplete dominance, who acts bidirectional. In the crosses: Cs3 x Ar4, Cs2 x Sigaretta bionda and Ar4 x Sigaretta bionda the incomplete dominance acts in the direction of increasing plant yield, while at crosses: Cs3 x Sigaretta bionda, Cs2 x Ico, Cayenne x Sigaretta bionda, Cayenne x Ico, Ar4 x Ico and Sigaretta bionda x Ico, this type of dominance has negative effects on plant yield. The over dominance has been associated with positive alleles in hybrids Cs3 x Cayenne and Cs3 x Cs2, and with negative alleles at Cs 2 x Cayenne, Cs 2 x Ar 4 şi Cayenne x Ar 4 crosses, respectively. In the case of the Cs3 x Ico cross, the dominance effects do not influence the inheritance of this trait. The crosses Cs3 x Ico, Cs3 x Cayenne and Sigaretta bionda x Ico presented the highest breeding potential for plant yield, representing a promising pre-breeding material for improvement of hot pepper yield.

The aim of this study was conducted to assess the combined ability, for chlorophyll content, proline content, and dehydration capacity of the leaves. In this sense was used 4 x 4 half diallel crosses of winter barley to identify the best parents and combinations of these. Combining ability analysis provides important information for selecting parents in terms of the performance of their hybrids for future use in breeding programs. For chlorophyll content, the additive gene action presented a major influence. The greatest general combining effects for proline content were achieved in the Adi and DH 260/18 varieties, the Adi variety possessing a high potential for transmitting this character to the offspring. The Andrew variety (-1.32) registered the most valuable additive effects for improving the dehydration capacity of the leaves.