Parametric and non-parametric indexes applied in the selection of sour passion fruit progenies

Abstract

Several traits must be observed in the selection of sour passion fruit progenies. For such, selection indices could be used for gradually increasing the frequency of favorable genotypes for the set of the traits of interest. This study aimed to compare parametric and non-parametric selection indices to be used in the selection of passion fruit progenies and identify the best economic weights. Thus, 118 full-sib families and three controls were assessed for days regarding flowering, productivity in kg ha-1 year, fruit mass in g, number of fruits, average length of fruits in mm, average fruit diameter in mm, fruit shape, average shell thickness in mm, pulp yield, pulp color, total soluble solids, titratable acidity and SS/ATT ratio. The non-parametric selection indexes used to obtain genetic gains were Mulamba and Mock, genotype-ideotype distance, multiplicative and Elston. Smith and Hazel, Williams and Pesek and Baker parametric indexes were used, with different economic weights attributed. The Mulamba and Mock, genotype-ideotype distance nonparametric selection indexes and the Williams parametric index showed satisfactory and balanced gains. The genetic variation coefficient, genetic standard deviation and random weight economic weights provided higher gains for non-parametric selection indexes. Similar gains were obtained for parametric indexes, regardless of assigned weight, except for Pesek and Baker, whose genetic standard deviation provided the highest gain.

Índices de seleção restritos empregados na seleção recorrente intrapopulacional do maracujazeiro azedo

“…Therefore, simultaneous selection of characters is a practice that maximizes chances of success in the breeding process (Cruz et al, 2014). This is shown in the results found by Dalbosco et al (2018), in which the highest genetic gains were obtained when the coefficient of genetic variation, genetic standard deviation, and random weight were assigned as economic weight for indexes in non-parametric selection. /COV Covariance between the scores of the index and the genetic value of the trait equal to 1000 for the trait MF.…”

“…Selection indexes have been applied in sour passion fruit breeding, with positive and balanced genetic gains (Dalbosco et al, 2018;Krause et al, 2012;Neves et al, 2011;Silva & Viana, 2012). Among those, the indexes of Smith (1936), Hazel (1943), Williams (1962), Pesek & Baker (1969) and Mulamba & Mock (1978) have stood out.…”

Selection indexes based on linear‐bilinear models applied to soybean breeding

“…Dalbosco et al. () compared parametric and non‐parametric indexes in passion fruit selection and observed superiority for Mulamba and Mock () index.…”

“…Thus, the Mulamba and Mock (1978) index is notable, based on the rank sum, provides balanced gains ensuring high total genetic gain in several crops (Leite et al, 2016(Leite et al, , 2018Rezende et al, 2014). Dalbosco et al (2018) compared parametric and nonparametric indexes in passion fruit selection and observed superiority for Mulamba and Mock (1978) index.…”

Genotypic superiority of Psidium Guajava S1 families using mixed modeling for truncated and simultaneous selection

“…Therefore, selection between and within families and the selection index are presented as options. Selection indexes allow for adding multiple information aimed at selection on the basis of a set of variables that gathers together a number of traits of economic interest at the same time (Cruz et al, 2014;Krause et al, 2012;Dalbosco et al, 2018). Based on the above, the objective of this study was to carry out the selecting, genetic parameter estimating, and predicting of genetic values in 18 S 1 families of Psidium guajava, by means of the mixed model methodology, and simultaneous selection of traits, using the additive selection index, multiplicative index, and mean rank adapted from Mulamba.…”