Consulta: creatorFacets:"Westra,P."
Registros recuperados: 2
Data/hora: 12/06/2024 02:58:50

Genetic diversity among proso millet (Panicum miliaceum) biotypes assessed by AFLP technique
Provedor de dados: Planta Daninha
Autores: Karam,D.; Westra,P.; Nissen,S.J.; Ward,S.M.; Figueiredo,J.E.F.
The Amplified Fragment Length Polymorphism (AFLP) technique was used to access genetic diversity between three domestic and nine wild proso millet biotypes from the United States and Canada. Eight primer combinations detected 39 polymorphic DNA fragments, with the genetic distance estimates among biotypes ranging from 0.02 to 0.04. Colorado-Weld County black seeded and Wyoming-Platte County were the most distinct biotypes according to the dissimilarity level. A UPGMA cluster analysis revealed two distinct groups of proso millet without any geographic association. Six weed biotypes exhibiting some characters of cultivated plants were grouped together with domesticated biotypes of proso millet while the three typical wild phenotypes were clearly clustered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proso millet; AFLP; Taxonomic relationship; Genetic diversity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582004000200001

Competition effects with mixed stands of wheat and kochia (Kochia scoparia) biotypes resistant and susceptible to acetolactase synthase inhibitor herbicides
Provedor de dados: Scientia Agricola
Autores: Christoffoleti,P.J.; Westra,P.
Greenhouse experiments were conducted to compare the competitive ability of sulfonylurea resistant and susceptible kochia (Kochia scoparia L. Schard) compared to wheat. The results of several replacement series experiments indicate that wheat was the dominant competitor, and an average of one wheat plant reduced resistant kochia yield per plant equal to the effect of 4.8 resistant kochia or 5.4 susceptible kochia plants. Intraspeciflc competition was more important than interspecific competition for wheat, whereas the reverse was true for the resistant and susceptible kochia. The results of the niche differentiation index (NDI) indicate that wheat and either resistant or susceptible kochia are only partly limited by the same resources. The resistant and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Herbicide resistance; Sulfonylurea; Kochia scoparia; Weed-crop competition.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200008