Data/hora: 03/06/2024 01:00:18

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Fifty years of wheat breeding in Southern Brazil: yield improvement and associated changes	
Autores: 	Rodrigues,Osmar; Lhamby,Julio César Barreneche; Didonet,Agostinho Dirceu; Marchese,José Abramo.	
Data: 	2007-06-01	
Ano: 	2007	
Palavras-chave: 	Triticum aestivum; Genetic gain; Harvest index; Yield components.	
Resumo: 	The objective of this study was to assess the impact of genetic breeding on grain yield, and to identify the physiological traits associated to the increment in yield and their related growth processes, for wheat cultivars grown in Southern Brazil, in the past five decades. Seven wheat cultivars released between 1940 and 1992, were compared for physiological aspects associated with grain yield. Grain yield, biological yield, biomass partitioning, harvest index and grain yield components were also determined. The number of grains per square meter was more affected by plant breeding and was better correlated with grain yield (r = 0.94, p&lt;0.01) than with grain weight (r = -0.39ns). The higher number of grains per square meter was better correlated with the number of grains per spike in the modern cultivars than in the older ones. The genetic gain in grain yield was 44.9 kg ha-1 per year, reflecting important efforts of the breeding programs carried out in Southern Brazil. Grain yield changes, during the period of study, were better associated with biomass production (r = 0.78, p&lt;0.01) than with harvest index (r = 0.65, p&lt;0.01).	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000600008	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X2007000600008	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.42 n.6 2007	
Fonte: 	info:eu-repo/semantics/openAccess