Herança de caracteres relacionados à produção de frutos em Capsicum baccatum var. pendulum com base em análise dialélica de Hayman

Abstract

Herança de caracteres relacionados à produção de frutos emAbstract -This work aimed to estimate genetic parameters related to the fruits production in a chilli pepper diallel (Capsicum baccatum var. pendulum). Five chilli pepper genitors were evaluated (UENF 1616, UENF 1624, UENF 1629, UENF 1639 and UENF 1732) and its respective hybrids F 1 , from a complete diallel without reciprocals. The experiment was carried out in a greenhouse covered with plastic film located in area from the consortium UENF/PESAGRO-RIO, Campos dos Goytacazes, RJ, from July/2009 to December/2009, in a randomized block design with three repetitions and nine plants by plot. The following agronomic traits were evaluated: canopy diameter (CD); plant height (PH); days for fruiting (DF); number of fruits by plant (NFP); fruit average-weight (FAW); fruit dry mass (FDM); dry matter (DM); fruit length (FL); fruit diameter (FD); fruit wall thickness (PT); total soluble solids (TSS); and yield per plant (PROD). Only the FAW, FDM and PROD had absence of significance concerning the three tests of sufficiency for the additive dominant model, indicating that there is homogeneity among the variances and co-variances and, consequently, lack of epistasis in the control of character. For the FAW and FDM traits, the additive genetic effects were the most important ones. Nevertheless, in the PROD the dominance effect was the most important. It was verified a partial dominance for FAW and FDM, and an over-dominance for PROD. The genitors UENF 1616 and UENF 1629 were the ones which had larger concentrations of favorable alleles for the three characteristics under study.

Gene effect and heterosis in Capsicum baccatum var. pendulum

“…pendulum produced by GONÇALVES et al (2011), usi ng a genetic full diallel design without reciprocals, were evaluated. The following accessions were used as parents: UENF 1616, UENF 1624, UENF 1629, UENF 1639 and UENF 1732 from the Germplasm Collection of the Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), characterized by MOURA et al (2010) and evaluated for resistance to pepper yellow mosaic virus by BENTO et al (2009) (Table 1).…”

“…However, the results of intraspecifi c hybridization in C. baccatum are scarce in the literature (RÊGO et al, 2009;GONÇALVES et al, 2011;RODRIGUES et al, 2012).…”

Determining the inheritance of agronomic traits in chili pepper

“…The potential of a base population and the selection efficiency for the development of cultivars can be investigated by means of the relative importance of additive, dominance and epistatic effects for each trait (Hallauer et al, 2010;Gonçalves et al, 2011). The existence of differences between the additive genetic values of individuals in a population is a necessary condition for intrapopulation improvement.…”

“…pendulum is still scarce in the literature (Rêgo et al, 2009;Gonçalves et al, 2011;Rodrigues et al, 2012) when compared with C. annuum. The knowledge of that information is important for the decision making about the breeding methods to be used or about the size of population to be conducted during the implementation of the improvement program.…”

“…Epistatic effects for AFM trait were also obtained by Juhász et al (2009) in C. annuum. However, Gonçalves et al (2011) studied the inheritance of traits related to fruit production in C. baccatum var. pendulum based on Hayman diallel analysis and they identified the absence of epistasis for FDM and AFM traits.…”