Interação genótipo x ambiente em soja com ênfase na estratificação ambiental para a região central do Brasil
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2011-12-19
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Universidade Federal de Goiás
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The objective of this study was to establish a consistent environmental
stratification for the region of soybean cropping in Central Brazil, based on genotype by
environment (GE) interaction analysis. For this, yield data from variety trials conducted by
Embrapa Cerrados in partnership with others Brazilian institutions, during seven growing
seasons (2002/03 to 2008/09), were used. The study covered six experimental sets that
were related to the genotypes of three maturity groups (early, medium and late), and two
commercial groups (soybean conventional and transgenic RR), totaling 559 trials analyzed.
The statistical treatment of data was performed in two stages: first, analyses of variance
were performed for each experiment, from which the estimates of treatment mean
(combination of genotype and environment) were obtained. In the second stage the joint
and GE interaction analyses were performed. Thus, the yield mean of each genotype in
each environment were submitted to the AMMI analysis (Additive Main effects and
Multiplicative Interaction model), that led to choose a model with only one principal
component (AMMI1). As result of this analysis, the genotypes and environments were
jointly represented in a scatter plot called biplot (graph that display the rows and columns
of a matrix; in this case, genotypes and environments are marginal in this table). To stratify
the target region, the approach of winner genotypes (Gauch & Zobel, 1997; Crop Sci. 37:
311-326) was used. In this approach each stratum is composed by locations that shared a
same winner genotype (one that is the higher yielding mean ranking of a location). In the
AMMI1 biplot, the boundaries of each stratum were identified by horizontal lines drawn
from the ordinate points (scores) corresponding to the environment of transition between
two strata, which are characterized by their winner genotypes. With this information, the
environmental strata were established for each growing year and experimental set. The
maturity groups of assessed lines determined the environmental stratification obtained.
Thus, the following locations were grouped to other localities, presenting a characteristic
of redundancy: a) early maturity group (seven strata): (Campo Novo do Parecis, Maracajú,
São Miguel do Araguaia, Tangará da Serra); (Conquista, Nuporanga, Sidrolândia, Sorriso);
(Cristalina, Iraí, Sacramento); (Montividiu, Sonora, Tapurah); (Capinópolis, Senador
Canedo); (Guaíra, Morro Agudo); and (Lucas do Rio Verde, Sapezal); b) medium maturity
group (four strata): (Anápolis, Montividiu, Tangará da Serra); (Barreiras, Campo Novo do
Parecis, Uberaba-Chapadões); (Chapadão do Sul, Conquista, Maracajú, Sonora); and (São
Gabriel, Sorriso, Uberaba-Epamig); c) late maturity group (five strata): (Campo Novo do
Parecis, Planaltina, Senador Canedo, Tapurah); (Iraí, Sacramento, Sonora); (Lucas do Rio
Verde, Sorriso); (Goiatuba, Tangará da Serra); and (Barreiras, São Desidério). Were also
identified key-locations to conduct the trials in the final stage of genotypic evaluation
(advanced variety trials): a) early maturity group: Anápolis, Barretos, Campos de Júlio,
Capinópolis, Chapadão do Céu, Chapadão do Sul, Goiatuba, Igarapava, Jataí, Luziânia,
Morro Agudo, Planaltina, Primavera do Leste, Sacramento, São Gabriel do Oeste, São
Miguel do Araguaia, Sapezal, Sidrolândia, Sonora, Uberaba-Chapadões, Uberaba-Epamig
e Unaí;b) medium maturity group: Barreiras, Barretos, Campo Alegre, Campos de Júlio,Capinópolis, Chapadão do Céu, Chapadão do Sul, Cristalina, Goiatuba, Iraí, Jataí, Lucas
do Rio Verde, Luziânia, Montividiu, Perolândia, Planaltina, Primavera do Leste, Rio
Verde, Sacramento, São Desidério, Senador Canedo, Sorriso e Unaí; c) late maturity
group: Anápolis, Campo Alegre, Campo Novo do Parecis, Campos de Júlio, Capinópolis,
Chapadão do Céu, Chapadão do Sul, Cristalina, Goiatuba, Jataí, Luziânia, Montividiu,
Primavera do Leste, Rio Verde, São Desidério, São Gabriel do Oeste, Sonora, Sorriso,
Uberaba-Chapadões, Uberaba-Epamig e Unaí. Finally, among the locations recommended
for the network of advanced trials, one was also appointed as key-location to conduct the
initial stages of genotypes assessment in each maturity group. The locations Campos de
Júlio (to early group), Rio Verde (medium and late groups) were in order indicated because
resulted the best rankings of the winner genotypes through the target region.
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Branquinho, Rodrigo Gomes - Interação genótipo x ambiente em soja com ênfase na estratificação ambiental para a região central do Brasil - 2011 - 147 f. - Dissertação - Programa de Pós-graduação em Agronomia (EAEA) - Universidade Federal de Goiás - Goiânia - Goiás - Brasil.