Assessment Genotype-Environment Interaction Biplot Gge Applying For Sugar Cane In Venezuela
Keywords:
GREG, IGA, mega-environment, saccharum spp hybridAbstract
The selection of sugar cane cultivars adapted to different environments becomes difficult when there is genotype x environment interaction (IGA). Recently, it has been used a new multivariate model called GGE biplot (SREG and GREG) for the interpretation of the IGA. In this model, linear terms of genotypes or environments are not considered individually and are added to the multiplicative term of genotype x environment interaction. The objective of this study was to identify mega-environments (MA), genotypes and superior environments for sugarcane yield (tons of sugarcane per hectare, TCH) and Pol % sugarcane by means of the regression models by sites (SREG) and by genotypes (GREG). There were used the data coming from twenty sugar cane genotypes evaluated in eight localities during two harvesting cycles. The GGE biplot based on SREG for TCH outlines two mega environments, the MA-1 is conformed by the Quebrada Arriba and FUNDACAÑA localities. The most productive genotypes of these locations were V99-208 and V98-62. The MA-2 grouped the localities Las Majaguas, Montaña Verde, Santa Lucía, Castillera and Ivonne. The most outstanding genotypes were V98-120, V00-50 and V91-15. In Pol % caña, the best genotypes were V99-245, CP74-2005, B80-408, V98-86 and V99-208 for a single MA that includes all localities.
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