Data/hora: 06/06/2024 08:41:18

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Resumo em Anais de Congresso
Data corrente: | 11/11/2015
Data da última atualização: | 11/11/2015
Autoria: | MARIGUELE, K. H.; ZAMBONIM, F. M.; VISCONTI, A.; HECK, T. C.
Título: | RELATIONSHIP BETWEEN PHENOTYPIC TRAITS OF AUSTRALIAN KING PALM.
Ano de publicação: | 2015
Fonte/Imprenta: | In: SIMPÓSIO DE RECURSOS GENÉTICOS PARA A AMÉRICA LATINA E CARIBE, 10., 2015, Bento Gonçalves. Resumos... São Carlos, SP: Aptor Software, 2015.
ISBN: | 978-85-63273-31-4
Idioma: | Inglês

Conteúdo:

Simple correlation allows the magnitude and meaning of an association between two traits to be evaluated, without
providing the required information about the direct and indirect effects of a group of traits in relation to a dependent
variable of greater importance. In certain cases, simple correlation coefficients may produce significant
misunderstandings about the relationship that exists between two variables, and may not represent an actual
measurement of cause and effect. A more informative measure of the relationship between variables is the
coefficient of partial correlation, which is estimated by removing the effects of other variables on the association
under study. Besides, path analysis is a technique that allows the effects of several independent variables on a basic
variable to be studied; estimates for those variables are obtained by means of regression equations, in which the
variables are initially standardized. The aim of this study was to estimate simple and partial coefficients of
correlation, as well as to divide their effects into direct and indirect using path analysis for phenotypic traits of
Australian king palm. An Archontophoenix spp population with 539 plants was assessed to five traits: plant height
(one year before the harvest), plant height and stem diameter (at harvest), edible basal stem and premium heart-ofpalm
yield. The harvest occurred in 3.5 year after planting and the data analyses were performed using the GENES
software. Based on the eigenvalues of the correlation matrix, we obtained condition numbers of 26.99 for traits.
Since these values were below 100, they indicate a weak multicollinearity, and a path analysis could be run, as the
estimates were not biased. Among the ten pairs of simple correlation, three were not significant: the two plant
heights/edible basal stem yield and edible basal stem yield/premium heart-of-palm yield. The other correlations
were significant and ranged from 0.44 - plant height one year before the harvest/premium heart-of-palm yield - up
to 0.88 - between the two plant height measurements. However, when the effects of other traits were removed from
the model to estimate partial correlations, only two relationships were significant: steam diameter/premium heartof-
palm yield and the two plant height measurements, 0.53 and 0.84, respectively. The premium heart-of-palm was
used as the dependent variable, because it is the characteristic of greater economic interest, while the others were
considered independent. The direct effects of plant height one year before the harvest, plant height at harvest and
the stem diameter on the dependent variable was 0.01, 0.27 and 0.56, respectively. The indirect effects of plant
height one year before the harvest via plant height at harvest and stem diameter were 0.24 and 0.22, respectively.
The indirect effect of plant height at harvest via stem diameter was 0.28, that value similar to the direct effect
(0.27). As for stem diameter, the direct effect was the highest magnitude, compared to the indirect effects. The
results of this work led to the conclusion that practicing selection based on simple correlation estimates may not be
convenient, since not always a cause and effect relationship can be verified between both traits. Among the traits,
stem diameter showed values of larger magnitudes, either by direct or indirect effect, with premium heart-of-palm.

Palavras-Chave: | partial correlation; path analysis; Simple correlation.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_36937.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (99584-1) - UPC - PL - DD -  -  -  - DIS