Avaliação agronômica morfológica e molecular de progênies de policruzamento de trevo branco (Trifolium repens L.) em dois locais do Rio Grande do Sul / Agronomic, morphological e molecular evaluation of white clover (Trifolium repens L.) polycrosses progeny in two places of Rio Grande do Sul

AUTOR(ES)

Raquel Schneider

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2010

RESUMO

White clover is a legume forage most widely used in pastures during the winter and spring in the RS, but nevertheless may have persistence problems, especially in summer. The aim of this work was to select higher forage yield and tolerance to low water availability genotypes, evaluating agronomically their progeny and characterizing them morphologically and genetically with the aid of SSR molecular markers. The agronomic evaluation was performed at the EEA / UFRGS, in Eldorado do Sul and Embrapa CPPSUL in the city of Bage. Was evaluated the DM yield of 22 progenies and the two white clover cultivars UFRGS and Jacuí, intercropped with ryegrass (Lolium multiflorum Lam.), during the years 2008 and 2009. The progenies were characterized using nine morphological markers in twenty plants of each treatment. The mother plants and progenies were genetically characterized using five SSR primers. The average DM yield of white clover during the two years was 3671 and 2107 kg / ha, in Eldorado do Sul and Bage, respectively. Statistical analysis separated the treatments into two groups in both locations by Scott &Knott (P <0.05) test. In Eldorado do Sul and Bage the cultivar Jacuí more thirteen progenies formed groups with higher production. Seven progeny were in the group "a" in both places, while only the cultivar UFRGS and one progenie had lower production in the two sites, there genotype-environment interaction. The group of morphological traits used to allow a good characterization of genotypes, with most of the progenies presenting at least one morphological difference compared to commercial cultivars. There is genetic variability in the germplasm analyzed for the morphological and molecular characteristics. This work verified that it is possible to select genotypes more productive and more resistant to summer conditions, optimizing the use of this specie.

ASSUNTO(S)

rio grande do sul trevo branco leguminosa forrageira

Documentos Relacionados

• Caracterização morfológica e molecular da coleção básica de trevo-branco (Trifolium repens L.)
• Avaliação agronômica de progênies de policruzamento de trevo-branco em dois locais do Rio Grande do Sul
• Características de diferentes genótipos de trevo branco (Trifolium repens L.), associadas à tolerância ao déficit hídrico
• Análise da diversidade genética e avaliação de características morfofisiológicas associadas à tolerância à seca em diferentes genótipos de trevo branco (Trifolium repens L.)
• Productivity of orchard grass (Dactylis glomerata L.) alone and associated with perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.)