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Cleiton Renato Casagrande, Henrique Caletti Mezzomo, Cosme Damião Cruz, Aluízio Borém and Maicon Nardino

ARTICLE – Choosing parent tropical wheat genotypes through genetic dissimilarity based on REML/ BLUP

Abstract: Parent selection is a crucial step in breeding programs. In the present
study, we evaluated the genetic diversity in tropical wheat genotypes using best
linear unbiased predictions (BLUPs) by different grouping methods. We identified
potential parents to compose a crossing block with the aim of improving wheat
for the Brazilian Cerrado. A total of 41 tropical wheat genotypes were evaluated
in a field experiment. The evaluated traits included days to flowering; disease
symptoms of fusarium head blight, blast, and leaf rust; flag leaf height; plant
height; spike mass; hectoliter weight; and grain yield. The BLUPs were estimated
and, from these, the standardized average Euclidean distance was calculated.
Then, UPGMA, Tocher, and principal component clusters were generated from
this genotypic distance matrix. Evaluating genetic diversity based on BLUP allowed the identification of two groups of highly dissimilar genotypes with high
estimated genotypic values with which to compose a partial diallel.

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