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Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
15/07/1998 |
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Data da última atualização: |
16/09/2019 |
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Autoria: |
MACHADO, C. C. |
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Título: |
Macrophomina phaseolina: biological behavior of isolates, spatial pattern of microsclerotia in the soil, and incidence on soybeans. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
Urbana: University of Illinois at Urbana-Champaign, 1987. |
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Páginas: |
195p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
Twelve isolates of Macrophomina phaseolina (Tassi) Goid. from different plants hosts and/or geographical locations were compared. All isolates were pathogenic to their original host and to soybean cultivar Corsoy 79. Only six isolates produced pycnidia on soybean meal agar. Production of pycnidium and size of conidia varied significantly (P-0.05) among sporulating isolates. Starch gel electrophoresis indicated similarities in isozyme production among isolates. The 12 isolates did not fit the three category classification of Pearson, et al. based on characteristics on potassio chlorate medium. A clustered pattern of microsclerotia of M. phaseolina in soil was found within 96 3 x 3 m quadrats located in an area grown in continuous soybeans for over 20 years. Results over 3 years indicated variation in the microscletial numbers as well as patterns in the soil among years. Evaluation of 12 soybean cultivars from maturity groups II, III, and IV grown in these quadrats indicated lower incidence of M. phaseolina on late-maturing cultivars than on early-maturing ones. There was no correlation between the number of microsclerotia in the soil and disease incidence on the cultivars. Two methods were used to evaluate incidence of M. phaseolina on two soybean cultivars grown under two cropping sequences, six tillage systems, and two row spacings in the 1983, 1984, 1985, and 1986 growing seasons. Field evaluation was not accurate in determining incidence of M.phaseolina. The incidence of the fungus was significantly higher on stem pieces after treatment with paraquat than on those not treated in the field. Tillage did not affect the incidence of M. phaseolina in continuous soybeans and had little effect in maize-soybean rotation plots. A higher incidence was found on soybean cultivar Corsoy 79 than Cumberland. The effect of row spacing on incidence of the fungus was significant in maize-soybean rotation plots but not in continuous soybeans. The overal incidence of M. phaseolina in the maize-soybean rotation plots did not differ significantly from that in continuous soybeans. Differences in the incidence between years were due to variation in rainfall and temperature during the growing seasons. MenosTwelve isolates of Macrophomina phaseolina (Tassi) Goid. from different plants hosts and/or geographical locations were compared. All isolates were pathogenic to their original host and to soybean cultivar Corsoy 79. Only six isolates produced pycnidia on soybean meal agar. Production of pycnidium and size of conidia varied significantly (P-0.05) among sporulating isolates. Starch gel electrophoresis indicated similarities in isozyme production among isolates. The 12 isolates did not fit the three category classification of Pearson, et al. based on characteristics on potassio chlorate medium. A clustered pattern of microsclerotia of M. phaseolina in soil was found within 96 3 x 3 m quadrats located in an area grown in continuous soybeans for over 20 years. Results over 3 years indicated variation in the microscletial numbers as well as patterns in the soil among years. Evaluation of 12 soybean cultivars from maturity groups II, III, and IV grown in these quadrats indicated lower incidence of M. phaseolina on late-maturing cultivars than on early-maturing ones. There was no correlation between the number of microsclerotia in the soil and disease incidence on the cultivars. Two methods were used to evaluate incidence of M. phaseolina on two soybean cultivars grown under two cropping sequences, six tillage systems, and two row spacings in the 1983, 1984, 1985, and 1986 growing seasons. Field evaluation was not accurate in determining incidence of M.phaseolina. The incidence of ... Mostrar Tudo |
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Palavras-Chave: |
Biological behavior; Comportamento biologico; Disease; Doenca, Fitopatologia; EUA; Fitopatologia; Phytopathology; Soybean; USA. |
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Thesagro: |
Doença; Fungo; Macrophomina Phaseolina; Soja. |
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Thesaurus NAL: |
fungi. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03053nam a2200301 a 4500
001 1444407
005 2019-09-16
008 1987 bl uuuu m 00u1 u #d
100 1 $aMACHADO, C. C.
245 $aMacrophomina phaseolina$bbiological behavior of isolates, spatial pattern of microsclerotia in the soil, and incidence on soybeans.
260 $aUrbana: University of Illinois at Urbana-Champaign$c1987
300 $a195p.
500 $aPh.D. Thesis.
520 $aTwelve isolates of Macrophomina phaseolina (Tassi) Goid. from different plants hosts and/or geographical locations were compared. All isolates were pathogenic to their original host and to soybean cultivar Corsoy 79. Only six isolates produced pycnidia on soybean meal agar. Production of pycnidium and size of conidia varied significantly (P-0.05) among sporulating isolates. Starch gel electrophoresis indicated similarities in isozyme production among isolates. The 12 isolates did not fit the three category classification of Pearson, et al. based on characteristics on potassio chlorate medium. A clustered pattern of microsclerotia of M. phaseolina in soil was found within 96 3 x 3 m quadrats located in an area grown in continuous soybeans for over 20 years. Results over 3 years indicated variation in the microscletial numbers as well as patterns in the soil among years. Evaluation of 12 soybean cultivars from maturity groups II, III, and IV grown in these quadrats indicated lower incidence of M. phaseolina on late-maturing cultivars than on early-maturing ones. There was no correlation between the number of microsclerotia in the soil and disease incidence on the cultivars. Two methods were used to evaluate incidence of M. phaseolina on two soybean cultivars grown under two cropping sequences, six tillage systems, and two row spacings in the 1983, 1984, 1985, and 1986 growing seasons. Field evaluation was not accurate in determining incidence of M.phaseolina. The incidence of the fungus was significantly higher on stem pieces after treatment with paraquat than on those not treated in the field. Tillage did not affect the incidence of M. phaseolina in continuous soybeans and had little effect in maize-soybean rotation plots. A higher incidence was found on soybean cultivar Corsoy 79 than Cumberland. The effect of row spacing on incidence of the fungus was significant in maize-soybean rotation plots but not in continuous soybeans. The overal incidence of M. phaseolina in the maize-soybean rotation plots did not differ significantly from that in continuous soybeans. Differences in the incidence between years were due to variation in rainfall and temperature during the growing seasons.
650 $afungi
650 $aDoença
650 $aFungo
650 $aMacrophomina Phaseolina
650 $aSoja
653 $aBiological behavior
653 $aComportamento biologico
653 $aDisease
653 $aDoenca, Fitopatologia
653 $aEUA
653 $aFitopatologia
653 $aPhytopathology
653 $aSoybean
653 $aUSA
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