Capacidade de combinação multivariada para caracteres de tubérculo em gerações iniciais de seleção em batata

Abstract

RESUMO A análise dialélica propicia estimativas de parâmetros úteis à seleção de genitores e ao entendimento dos efeitos genéticos envolvidos na determinação dos caracteres. O objetivo deste trabalho foi estimar 2CRI-1149-1-78", "Eliza", "C-1786

Estimating combining ability in popcorn lines using multivariate analysis

“…Low GCA values indicate that the mean of hybrids in which line i participates does not differ from the overall diallel mean. In contrast, high values -positive or negative-indicate that line i is much better or worse than the other lines included in the diallel in relation to the mean of their hybrids (Sprague and Tatum, 1942). In the present study, only parent P2 had positive association values for the two components; this outcome occurred as a result of the positive association of traits related to PC1 and popping expansion for PC2.…”

“…The multivariate diallel ANOVA of the model by Griffing (1956) revealed significant effects of the general combining ability on traits of the group I (GY, GW, NE, PE, and FS) and group II (SILK, PH, EH, and LB), which indicates that the parents have complementary genes and that traits can be considered altogether in diallel analysis (Ledo et al, 2003;Silva et al, 2008;Benin et al, 2009) (Table 3).…”

Multivariate diallel analysis allows multiple gains in segregating populations for agronomic traits in Jatropha

“…This analysis was significant by the Wilk test, indicating that the parents and the hybrid combinations have complementary alleles and the traits can be considered together in diallel analysis (Ledo et al, 2003;Silva et al, 2008;Benin et al, 2009). Analysis of the first two principal components retained 81% of the accumulated variance between the traits and, therefore, estimates of GCA and SCA were obtained on these components (Ledo et al, 2003).…”

“…Silva et al (2008) and Benin et al (2009) also reported the effectiveness of this technique in identifying the parents and superior hybrid combinations aiming at gaining multiple traits in wheat.…”

Capacidade de combinação de genitores de batata para caracteres de aparência e rendimento de tubérculos

“…Silva et al (2009) verificaram que as capacidades de combinação dos caracteres rendimento de tubérculos, número de tubérculos por planta e massa média de tubér-culos podem ser estimadas por meio de dialelo parcial, para as geração de plântula e primeira geração de campo. Da mesma forma, Silva et al (2008) relataram que, para os caracteres aspereza da película, sobrancelha, achatamento, curvatura, apontamento e aparência de tubérculo, avaliados na primeira e segunda gerações de campo, as estimativas de capacidade de combinação foram eficientes na identificação das melhores combinações de genitores, por meio da análise dialélica conjunta.…”