Estimativas de correlação e repetibilidade para caracteres do fruto de bacurizeiro

Abstract

RESUMOConduziu-se este trabalho com o objetivo de estimar os coeficientes de correlação e de repetibilidade envolvendo doze caracteres do fruto de bacurizeiro: comprimento do fruto (CF), diâmetro do fruto (DF), espessura da casca (EC), peso da casca (PC), peso das sementes (PS), número de sementes (NS), volume da cavidade interna (VCI), peso do fruto (PF), peso total de polpa (PTP), porcentagens de casca (%C), sementes (%S) e polpa total (%PTP). As estimativas dos coeficientes de repetibilidade das características CF, DF, EC, PC, PS, VCI, PTP, %C e %PTP demonstraram alta regularidade nos indivíduos, e quatro a doze medições são necessárias para obter predições com confiabilidade em torno de 95%. Com exceção do caráter EC, não foram observadas grandes diferenças entre as estimativas dos coeficientes de repetibilidade obtidos pelo método da ANOVA e pelos métodos de análise multivariada. O aumento na precisão em termos de predição do valor real dos indivíduos além de 95% implicará aumentar, sobremaneira, o número de medições, que, por sua vez, pouco acrescentará em termos de precisão, sendo, então, injustificado seu uso. PTP apresentou associações positivas com o DF, VCI e PF. Termos para indexação:Platonia insignis, herdabilidade, fruticultura, caracterização, acesso. ABTRACTThis work had as aim to estimate the repeatability and correlation coefficients involving twelve characters of the bacurizeiro fruit: length of the fruit (CF), diameter of the fruit (DF), thickness of the rind (EC), weight of the rind (PC), weight of the seeds (PS), number of seeds (NS), volume of internal cavity (VCI), weight of the fruit (PF), total weight of pulp (PTP), percentages of rind (%C), seeds (%S) and total pulp (%PTP). The estimates of the coefficients of repeatability of characteristics CF, DF, EC, PC, PS, VCI, PTP, %C and %PTP demonstrated high regularity in the individuals and four to twelve measurements are necessary to get predictions with around 95% of reliability. With exception of character EC, had not been observed great differences between the estimates of the coefficients of repeatability obtained by the ANOVA method and the methods of multivaried analysis. The increase in the precision in terms of prediction of the real value of the individuals beyond 95%, will imply to excessive increase, in the number of measurements adding little in precision terms, being then unjustifiable its use. Total weight of pulp presented positive associations with the diameter of fruit, volume of the internal cavity and weight of the fruit.

Caracterização Biométrica De Frutos E Sementes De Castanha-Do-Brasil Na Amazônia Mato-Grossense

“…A De acordo com FARIAS NETO et al (2004), estimativas de correlação podem ser úteis quando determinada característica de interesse é de difícil avaliação, assim, o processo de seleção se torna mais simples, se essa característica apresentar alta correlação positiva com outra de fácil avaliação. Ou seja, aumentos em uma característica tendem estar associado a aumentos na outra e vice-versa, dessa maneira, não há necessidade de adoções de restrições no processo de seleção para obtenção de ganhos no sentido desejado.…”

Biometrics seeds, emergence and vigor of camu-camu seedlings depending on the seed coat coloring

“…Several authors verified the scarcity of biometric studies in native species, which could give support in programs for recovery of degraded area and genetic improvement due to the great variability in seed size, coloration of seed tegument and others [10]- [12]- [19]- [13]- [28]. Thus, the results of biometric studies of fruits and seeds represent important subsides to the establishment of techniques of eatable fruits [26].…”

ESTIMATES OF GENETIC PARAMETERS USING RELM/BLUP FOR INTRA-POPULATIONAL GENETIC BREEDING OF Platonia insignis Mart.

“…Although several authors have already evaluated parameters related to the variability of the bacuri fruit (SOUZA et al, 2001;CARVALHO et al, 2003;FARIAS NETO et al, 2004;ROGEZ, 2004;AGUIAR et al, 2008;SILVA et al, 2009), most of these studies evaluated fruit collected in native populations, which in the absence of experimental structures generated little information relevant to the genetic improvement of this species that is still incipient.…”

“…In studies conducted by Farias Neto et al (2004) and Silva et al (2009), the most important genetic parameters estimated for the variables evaluated were the repeatability coefficient, which express the maximum amount that the heritability, in the broad sense, can reach, because represents the proportion of phenotypic variance due to genetic differences, jointly with the permanent effects that the genotypes are under within the environment in which the plants were evaluated (CRUZ et al, 2007). The relevant information obtained from these studies on native populations was restricted to the indication of how many phenotypic assessments would be necessary to perform discrimination of agro-technological variables related to the fruit, in accordance with the accuracy desired by the researcher, preventing evaluation of Estimates of genetic parameters using... a large number of measurements without a significant gain in accuracy, reducing the time and cost of labor demanded to perform these assessments (CRUZ et al, 2004).…”