Data/hora: 10/06/2024 06:35:12

Provedor de dados: | 63
País: | Brazil
Título: | Analyzing genotype-by-environment interaction using curvilinear regression
Autores: | Pereira,Dulce Gamito Santinhos; Rodrigues,Paulo Canas; Mejza,Iwona; Mejza,Stanislaw; Mexia,João Tiago.
Data: | 2012-12-01
Ano: | 2012
Palavras-chave: | Scheffé multiple comparison method; Joint regression analysis; Test for parallelism; Test of coincidence.
Resumo: | In the context of multi-environment trials, where a series of experiments is conducted across different environmental conditions, the analysis of the structure of genotype-by-environment interaction is an important topic. This paper presents a generalization of the joint regression analysis for the cases where the response (e.g. yield) is not linear across environments and can be written as a second (or higher) order polynomial or another non-linear function. After identifying the common form regression function for all genotypes, we propose a selection procedure based on the adaptation of two tests: (i) a test for parallelism of regression curves; and (ii) a test of coincidence for those regressions. When the hypothesis of parallelism is rejected, subgroups of genotypes where the responses are parallel (or coincident) should be identified. The use of the Scheffé multiple comparison method for regression coefficients in second-order polynomials allows to group the genotypes in two types of groups: one with upward-facing concavity (i.e. potential yield growth), and the other with downward-facing concavity (i.e. the yield approaches saturation). Theoretical results for genotype comparison and genotype selection are illustrated with an example of yield from a non-orthogonal series of experiments with winter rye (Secalecereale L.). We have deleted 10 % of that data at random to show that our meteorology is fully applicable to incomplete data sets, often observed in multi-environment trials.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600003
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162012000600003
Formato: | text/html
Fonte: | Scientia Agricola  v.69 n.6 2012
Fonte: | info:eu-repo/semantics/openAccess