Tall Fescue
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. Rendimento de grãos e características agronômicas de soja em função de pastagens perenes em sistema de plantio direto
O objetivo do presente estudo foi avaliar o desempenho de soja em sistemas de produção com integração lavoura-pecuária em plantio direto. Constituíram os tratamentos cinco sistemas de produção: sistema I (trigo/soja, ervilhaca/milho e aveia branca/soja); sistema II (trigo/soja, pastagem de aveia preta + ervilhaca/milho e aveia branca/soja); sistema I
Bragantia. Publicado em: 08/08/2014
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2. Genetic diversity in a world germplasm collection of tall fescue
Festuca arundinacea Schreb., commonly known as tall fescue, is a major forage crop in temperate regions. Recently, a molecular analysis of different accessions of a world germplasm collection of tall fescue has demonstrated that it contains different species from the genus Festuca and allowed their rapid classification into the three major morphotypes (Conti
Genet. Mol. Biol.. Publicado em: 17/05/2013
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3. Evolutionary diversification of fungal endophytes of tall fescue grass by hybridization with Epichloë species.
The mutualistic associations of tall fescue (Festuca arundinacea) with seed-borne fungal symbionts (endophytes) are important for fitness of the grass host and its survival under biotic and abiotic stress. The tall fescue endophytes are asexual relatives of biological species (mating populations) of genus Epichloë (Clavicipitaceae), sexual fungi that cause
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4. Variation in Nitrogen Utilization in Acremonium coenophialum Isolates †
Acremonium coenophialum, a fungal endosymbiont in tall fescue, is responsible for the production of alkaloid toxins. Animals grazing endophyte-infected tall fescue often show toxicosis. In marginal environments, the endophyte is important for long-term survival of tall fescue. Few differences in endophyte isolates from individual tall fescue plants have been
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5. Insect Feeding Deterrents in Endophyte-Infected Tall Fescue †
The presence of an endophytic fungus, Acremonium coenophialum, in tall fescue (Festuca arundinacea) deterred aphid feeding by Rhopalosiphum padi and Schizaphis graminum. Both species of aphid were unable to survive when confined to endophyte-infected tall fescue plants. Feeding deterrents and toxic factors to R. padi and Oncopeltus fasciatus, large milkweed
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6. Characterization of Fructan from Mature Leaf Blades and Elongation Zones of Developing Leaf Blades of Wheat, Tall Fescue, and Timothy 1
Water-soluble carbohydrate composition of mature (ceased expanding) leaf blades and the elongation zone of developing leaf blades was characterized in wheat (Triticum aestivum L.), tall fescue (Festuca arundinacea Schreb.), and timothy (Phleum pratense L.). These species were chosen because they differ in mean degree of polymerization (DP) of fructan in the
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7. Photosynthesis in Fescue 1: III. RATES OF ELECTRON TRANSPORT IN A POLYPLOID SERIES OF TALL FESCUE PLANTS
Photosystem I electron transport activity has been found to be considerably higher in a decaploid tall fescue (Festuca arundinacea Schreb.) genotype as compared to a common hexaploid genotype. The decaploid genotype also displayed a higher photosystem whole chain (Photosystem II plus Photosystem I uncoupled) activity, suggesting a connection between polyploi
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8. Ribulose Bisphosphate Carboxylase: Altered Genetic Expression in Tall Fescue 1
A decaploid tall fescue (Festuca arundinacea Schreb) genotype has been found which exhibits net photosynthetic rates of 32 to 41 mg CO2/dm2·hour as opposed to a mean of 22 mg CO2/dm2·hour for 10 hexaploid genotypes. The decaploid genotype exhibited a ribulose 1,5-bisphosphate (RuBP) carboxylase specific activity 1.3- to 2-fold higher than typical tall fesc
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9. Epichloë typhina from toxic tall fescue grasses.
Epichloë typhina, a clavicipitaceous systemic phytopathogen, was isolated from two varieties and three hybrids of tall fescue (Festuca arundinaceae). The morphology of the fescue isolates was compared with E. typhina isolated from bent grass (Agrostis perennans). In all isolates, conidia were identical and were typical of E. typhina. In fescue grasses the e
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10. Photosynthesis of Grass Species Differing in Carbon Dioxide Fixation Pathways: IV. ANALYSIS OF REDUCED OXYGEN RESPONSE IN PANICUM MILIOIDES AND PANICUM SCHENCKII1
Reduced photorespiration has been reported in Panicum milioides on the basis of lower CO2 compensation concentrations than in C3 species, lower CO2 evolution in the light, and less response of apparent photosynthesis to O2 concentration. The lower response to O2 in P. milioides could be due to reduced O2 competition with CO2 for reaction with ribulose 1,5-bi
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11. Fructan Content and Synthesis in Leaf Tissues of Festuca arundinacea1
The concentration of fructan in tall fescue (Festuca arundinacea Schreb.) changes during growth and in response to environment. The objective of this research was to compare the fructan concentration and fructosyl-transferase activity of tall fescue leaf tissues. Expanding leaves, inner and outer sheaths, and expanded blades of greenhouse-grown tall fescue p
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12. Photosynthesis in Fescue: I. HIGH RATE OF ELECTRON TRANSPORT AND PHOSPHORYLATION IN CHLOROPLASTS OF HEXAPLOID PLANTS 1
Chloroplasts isolated from tall fescue, Festuca arundinacea Schreb., showed high rates of electron transport, comparable to rates observed for spinach chloroplasts.