Repeatability of biometric characteristics of Juçara palm fruit

Abstract

Juçara is a plant that occurs in the Brazilian Atlantic Forest which presents high ecological importance to the biodiversity and is present on the list of endangered species. The fruits are known as super fruits because they present chemical characteristics of great importance. Due to its elevated economic importance and for the low number of researches with this species, the first step is to make the pre-breeding of the species. This consists in morphological characterization, which is very dependent on time and labour. Thus, the decrease of the number of evaluated measurements by individual is of great importance to the phases of pre-breeding and breeding. The objective of this work was to obtain estimates of the coefficients of repeatability and determination of six Euterpe edulis fruit characteristics to enable the prediction of the necessary number of measurements required to achieve given levels of certainty for the real values for each of the six fruit characteristics. The performances of various methods for repeatability estimation were compared. The characteristics longitudinal diameters of the fruits, longitudinal diameters of the seeds, equatorial diameters of the fruits, equatorial diameters of the seeds, fruit weights and seed weights of juçara palm fruits were measured, and the deviances, the coefficients of repeatability, the coefficients of determination, and the necessary numbers measurements for an accurate prediction of the real value of the population were estimated. The methods used do not differ as to estimate the repeatability coefficient to the longitudinal diameter characteristics of the fruit, seed equatorial diameter, fruit mass and seed mass. With 95% reliability is possible to use four (4) for mass measurements of fruit and five (5) measurements for longitudinal diameter of fruit, seed equatorial diameter, fruit mass and seed mass.

Genomic studies of the additive and dominant genetic control on production traits of Euterpe edulis fruits

“…To evaluate the equatorial and longitudinal diameters of fruits and seeds (EDF, LDF, EDS and LDS, respectively) (mm), five fruits were measured in millimeters (mm) using a digital caliper. Marçal et al (2016) 31 concluded that five measurements are necessary to achieve a 95% coefficient of determination — although they provide additional information on the studies, measurements beyond this number increase cost and evaluation time.…”

Coefficient of repeatability, stability,and adaptability estimates for Psidium guajava S1 progenies via mixed models

“…By this estimate, it is possible to forecast how many evaluations will be needed for selection with greater reliability. Thus, estimated heritability, individual repeatability, and genotypic correlation parameters are essential during harvests for the breeder to select superior individuals (MARÇAL et al, 2016). In some studies, with perennial crops in this scenario, the authors found that to select promising genotypes with greater efficiency, it is more convenient to increase the number of years and places evaluated than the number of progenies (DANNER et al, 2010;BRUNA et al, 2012;CARGNIN, 2016;IMAI et al, 2016;RODRIGUES et al, 2017;QUINTAL et al, 2017).…”

Estimation of repeatability and genotypic superiority of elephant grass half-sib families for energy purposes using mixed models

“…The REML/BLUP methodology also allows estimating the repeatability coefficient, which is highly relevant, considering that selection in perennial species requires a long time due to the long productive and reproductive cycles and the need to conduct extensive and expensive experiments. The REML/BLUP allows selecting superior genotypes with greater efficiency and lower operating costs (Marçal et al, 2016).…”