Heritability, Repeatability, and Genetic Gains in a Improvement Population of Cajuízeiro

Abstract

-Cajuí (Anacardium spp) is an endemic fruit trees species in the Northeastern region of Brazil. Thus, this trial aimed to estimate the repeatability coefficients of the agrotechnological variables and to predict the genetic gains of a cajuí improvement population located at the Embrapa Meio-Norte. The data of twelve variables from every crop were evaluated using Selegen-REML/BLUP. The variables were ordered accordingly: V1 fruit mass (FM, in g), V2 peduncle mass (PM, in g), V3 chestnut mass (CM in g), V4 basal diameter (BD in cm), V5 apical diameter (AD in cm), V6 fruit length (FL in cm), V7 firmness of endosperm (FIRM, in N), V8 content of vitamin C (PVC in %), V9 total soluble solids (TSS in %), V10 pH of endosperm (pH), V11 total titratable acidity (TTA in %), and V12 relation TSS/TTA (undimensional). The fruit mass and its vitamin C contents can be estimated from measures of the fruit basal diameter and/or peduncle length, which are easy to be taken and measured experimentally. The medium and high estimates of the repeatability coefficient allowed for the early selection of the genotype 4 with accuracy from the two measures (years). The genotype 4 showed the best prediction means for physical and technological attributes and may be considered a possible candidate for asexual reproduction on crops with double purpose (fresh consumption and industrial).

Repeatability coefficients and genetic gains in table grape progenies for the Brazilian semi-arid region

“…In contrast, high values of heritability for soluble solids content were observed in passion fruit (Santos et al, 2015). In general, the repeatability values observed in this study were higher than those mentioned for native perennial species such as bacuri (Maia et al, 2016b) and Brazil nut (Pedrozo et al, 2015). However, repeatability coefficients in grape were compatible to those mentioned by Leão and Costa (2003) and Cargnin (2016) for production, number of bunches, and bunch weight, but lower than those for soluble solids content.…”

“…This methodology has been widely used to estimate genetic parameters, select progenies, adaptability and stability. It is also used in breeding programs of perennial species, such as bacuri (Maia et al, 2016a), cajuí (small cashew) (Maia et al, 2016b), baru (Santos et al, 2014), Brazil nut (Pedrozo et al, 2015), passion fruit (Santos et al, 2015;Freitas et al, 2016;Silva et al, 2016), coffee (Rodrigues et al, 2013), peach (Bruna et al, 2012, and others. Nevertheless, references in the literature were not found regarding the use of this method in grape breeding.…”

Repeatability coefficient estimates and optimum number of harvests in graft/rootstock combinations for 'tahiti' acid lime

“…In the results of this study, the estimated repeatability was classified as moderate for NFP and FYP and low for TFD and LFD. Similar findings have been reported for other fruit crops, such as banana (Lessa et al, 2014), sweet orange (Negreiros et al, 2008), cashew (Maia et al, 2016), guava (Quintal, Viana, Campos, Vivas, & Amaral Junior, 2017), mangaba (Fonseca et al, 2018), grapes (Leão, Nunes, & Souza, 2018), and cupuassu (Alcoforado, Pedrozo, Mayer, & Lima-Primo, 2019).…”