| |
Boletim de Pesquisa Online Nº 5, dez./2000 |
BIOCLIMATIC CHARACTERIZATION OF BRAZILIAN WHEATS
Abstract
High yield and production stability are the major objectives of most of the wheat breeding programs in Brazil and, probably, in the world. One has to take into account the adaptation of the developed genotypes to the environment where they will be grown. The adaptation of genotypes to different environments is genetically controled, and for it to happen it is necessary the ocurrency at an adequate level, it is necessary the satisfation of its bioclimatic requeriment; particularly temperature, including vernalization, and photoperiod. This paper contains the available information about the bioclimatic characterization of wheat genotypes developed in Brazil or introduced derived from the work of Pascale & Mota (1966), Mota & Goedert (1969), Wendt (1982), and Cunha et al. (1997), using experiments with continued sowings, between April and October, conducted in Pelotas (31°45’S, 52°21’W, and 13 m altitude), and in Passo Fundo (28°15’S, 52°24’W, and 687 m altitude), Rio Grande do Sul state (RS), Brazil; and trials conducted with this aim in 1999 and in 2000, at Embrapa Trigo, Passo Fundo, RS. Based on the typical curves of the Geslin Heliotermic Index, and using the experiments conducted in Passo Fundo (1994, 1995, 1996, 1999, and 2000) the genotypes tested were classified in bioclimatic groups as follow: very early (68 genotypes), early (56 genotypes), semi-late (14 genotypes), and late (5 genotypes).
Key words:bioclimatology, bioclimatic group, vernalization, photoperiod, wheat, Brazil.
1
Autor para correspondência. E-mail:cunha@cnpt.embrapa.br.
Boletim de
Pesquisa Online Nº 5 
Publicações Online
Copyright © 2000, Embrapa Trigo