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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
13/10/1992 |
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Data da última atualização: |
22/05/2017 |
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Autoria: |
FRANCA NETO, J. B.; WEST, S. H. |
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Afiliação: |
EMBRAPA-CNPSo. Londrina, PR. |
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Título: |
Problems in evaluating viability of soybean seed infected with Phomopsis spp. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Journal of Seed Technology, Beltsville, v.13, n.2, p.122-135, 1989. |
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Idioma: |
Inglês |
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Conteúdo: |
The detrimental effects of Phomopsis spp. on seed germination of soybean [Glycine max (L.) Merrill] are broadly recognized. Rolled paper toweling is the most widely used method for testing germination of soybean seed. The validity of the rolled-paper-towel test to determine the actual viability of soybean seed infected with Phomopsis spp. was examined. Seventy-three seed samples of 23 soybean cultivars produced in Florida in 1986 were analyzed for germination, vigor [tetrazolium (TZ) test], and pathogens. Phomopsis spp. were the fungi most frequently associated with soybean seed (up to 77% seed infection). Infection by these microrganisms was mainly restricted to the seedcoat. Deep-seated infection was rare (mean 0.5%). Viability, as obtained by the standard germination test (rolled paper toweling) was drastically reduced by high (> 33%) levels of Phomopsis spp. These detrimental effects were not observed when germination was examined in sand, if conditions were adequate for fast emergence. When seed were tested in sand, the infected seedcoats remained in or on the sand upon emergence, thus the seedlings escaped much of the detrimental effects of infected seedcoats. Therefore, rolled paper toweling was not the best substrate to evaluate germination of soybean seed infeced with high levels of Phomopsis spp. Emergence in sand or the TZ test provided more realistic estimates of viability for seed lots infected with these fungi. Nevertheless, it was noted that as the vigor level expressed by the TZ test decreased, the level of infected seedlings and damping-off tended to increase. MenosThe detrimental effects of Phomopsis spp. on seed germination of soybean [Glycine max (L.) Merrill] are broadly recognized. Rolled paper toweling is the most widely used method for testing germination of soybean seed. The validity of the rolled-paper-towel test to determine the actual viability of soybean seed infected with Phomopsis spp. was examined. Seventy-three seed samples of 23 soybean cultivars produced in Florida in 1986 were analyzed for germination, vigor [tetrazolium (TZ) test], and pathogens. Phomopsis spp. were the fungi most frequently associated with soybean seed (up to 77% seed infection). Infection by these microrganisms was mainly restricted to the seedcoat. Deep-seated infection was rare (mean 0.5%). Viability, as obtained by the standard germination test (rolled paper toweling) was drastically reduced by high (> 33%) levels of Phomopsis spp. These detrimental effects were not observed when germination was examined in sand, if conditions were adequate for fast emergence. When seed were tested in sand, the infected seedcoats remained in or on the sand upon emergence, thus the seedlings escaped much of the detrimental effects of infected seedcoats. Therefore, rolled paper toweling was not the best substrate to evaluate germination of soybean seed infeced with high levels of Phomopsis spp. Emergence in sand or the TZ test provided more realistic estimates of viability for seed lots infected with these fungi. Nevertheless, it was noted that as the vigor level... Mostrar Tudo |
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Palavras-Chave: |
Disease; Emergence; EUA; Phomopsis spp; Seed; Soybean; Teste; Tetrazolio; Tetrazolium test; USA. |
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Thesagro: |
Doença; Emergência; Fungo; Germinação; Glycine Max; Semente; Soja. |
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Thesaurus Nal: |
Florida; germination; vigor. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02503naa a2200373 a 4500
001 1444629
005 2017-05-22
008 1989 bl uuuu u00u1 u #d
100 1 $aFRANCA NETO, J. B.
245 $aProblems in evaluating viability of soybean seed infected with Phomopsis spp.
260 $c1989
520 $aThe detrimental effects of Phomopsis spp. on seed germination of soybean [Glycine max (L.) Merrill] are broadly recognized. Rolled paper toweling is the most widely used method for testing germination of soybean seed. The validity of the rolled-paper-towel test to determine the actual viability of soybean seed infected with Phomopsis spp. was examined. Seventy-three seed samples of 23 soybean cultivars produced in Florida in 1986 were analyzed for germination, vigor [tetrazolium (TZ) test], and pathogens. Phomopsis spp. were the fungi most frequently associated with soybean seed (up to 77% seed infection). Infection by these microrganisms was mainly restricted to the seedcoat. Deep-seated infection was rare (mean 0.5%). Viability, as obtained by the standard germination test (rolled paper toweling) was drastically reduced by high (> 33%) levels of Phomopsis spp. These detrimental effects were not observed when germination was examined in sand, if conditions were adequate for fast emergence. When seed were tested in sand, the infected seedcoats remained in or on the sand upon emergence, thus the seedlings escaped much of the detrimental effects of infected seedcoats. Therefore, rolled paper toweling was not the best substrate to evaluate germination of soybean seed infeced with high levels of Phomopsis spp. Emergence in sand or the TZ test provided more realistic estimates of viability for seed lots infected with these fungi. Nevertheless, it was noted that as the vigor level expressed by the TZ test decreased, the level of infected seedlings and damping-off tended to increase.
650 $aFlorida
650 $agermination
650 $avigor
650 $aDoença
650 $aEmergência
650 $aFungo
650 $aGerminação
650 $aGlycine Max
650 $aSemente
650 $aSoja
653 $aDisease
653 $aEmergence
653 $aEUA
653 $aPhomopsis spp
653 $aSeed
653 $aSoybean
653 $aTeste
653 $aTetrazolio
653 $aTetrazolium test
653 $aUSA
700 1 $aWEST, S. H.
773 $tJournal of Seed Technology, Beltsville$gv.13, n.2, p.122-135, 1989.
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