Repeatability of fruit traits from two Hancornia speciosa populations from the core region of the Brazilian Cerrado

Abstract

The objective of this work was to estimate the repeatability coefficients of mangaba (Hancornia speciosa) fruit traits, in order to define the number of fruit needed for an accurate selection of superior genotypes, as well as to conjecture about the nature of the phenotypic variation of these traits. Evaluations were performed for 160 fruit of 16 genotypes from two native H. speciosa populations of Goiás Velho and Padre Bernardo, in the state of Goiás, Brazil. Repeatability was estimated by the analysis of variance, principal component analyses based on covariance and on the correlation matrix, and structural analysis based on the correlation matrix. Repeatability estimates for fruit weight, diameter, and length, as well as seed number and weight, were of low magnitude, from 0.02 to 0.62, indicating low heritability. Repeatability estimates for ºBrix, titratable acidity, and ºBrix/acidity ratio were higher, from 0.34 to 0.91, indicating a low to potentially moderate heritability. The number of fruit for an effective selection of the best genotypes for titratable acidity, ºBrix, ºBrix/acidity ratio, and fruit weight is four for a 0.85 accuracy level. However, seven fruit would allow 0.90 accuracy for the same traits, and 0.85 accuracy for fruit length and diameter. The number and weight of seed per fruit are not effective for predicting the real value of a genotype.

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).…”

“…Repeatability using the REML/BLUP methodology has been used in other fruit trees to determine the optimal number of measurements without compromising accuracy (Fonseca, Morais, Gonçalves, Aquino, & Rocha, 2018;Lessa et al, 2014;Negreiros, Andrade-Neto, Miqueloni, & Lessa, 2014). Sanchéz et al (2017) evaluated that the number of measures to evaluate the productivity of Annona muricata L. could be reduced from sixteen to eight, maintaining a repeatability and accuracy coefficient above 80%.…”

Phenotypic variation, functional traits repeatability and core collection inference in Synsepalum dulcificum (Schumach & Thonn.) Daniell reveals the Dahomey Gap as a centre of diversity

“…In perennial species, the coefficient of repeatability, which is the correlation between repeated measurements of the same individual over time and/or space is considered a reliable estimator of broad-sense heritability 31 . It has been used for fruit-traits heritability estimation in several tropical, subtropical and temperate tree species including mangabeira (Hancornia speciose Gomes) 32 , akebia [Akebia trifoliate (Thumb.) Koidz.]…”

Reproductive phenology, morphoagronomic variability, and selection of mother plants of Hancornia speciosa Gomes (Apocynaceae)

“…Its various parts are also often used in traditional medicine to combat symptoms and diseases (Santos et al 2013;Coutrim and Souza 2018), and the efficiency of some of these applications has been corroborated by pharmacological studies (Marinho et al 2011;Penido et al 2017). Despite its huge potential for exploitation, especially in the food and pharmaceutical industries, the production of mangaba results from predatory extractivism (Fonseca et al 2018) and populations of this fruit species face drastic reductions due to the advance of anthropogenic activities in their areas of natural occurrence (Gilberto 2015).…”