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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
25/07/1997 |
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Data da última atualização: |
25/07/1997 |
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Autoria: |
NASSER, L. C. B. |
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Título: |
Studies on microorganisms carried by ceral seeds produced in Brazil and Washington: their influence on seedling vigor, chemical and biological control, and histology of Septoria nodorum (Berk.) Berk. on wheat seed |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
Washington: Washington State University, 1983. |
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Páginas: |
195p. |
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Série: |
Tese de Doutorado. |
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Idioma: |
Inglês |
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Notas: |
Tese de Doutorado. Orientada por: J.Water Hendrix. |
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Conteúdo: |
Four hundred kernels of each of 82 imported seed lots were plated on each of three cultural media for the purpose of establishing the sanitary status of ceral seed produced in Brazil. The media were somewhat differential in revealing microorganisms. Of 32,800 seeds plated on potato-dextrose agar, 17,783 yielded a fungus colony. Alternaria spp. and Drechslera spp. were among the most frequently isolated fungi. The blotter method tended to favor the emergence of Cladosporium spp. and Drechdlera spp., while oxgall agar medium permitted the development of Septoria nodorum, Fusarium spp. and Pseudomonas syringae. in general, Brazil-grown seed was heavily laden with pathogens. Barley, with an infection level of 50.5%, was more infested than triticale (43.3%) or wheat (26.6%). Of undoubted significance was the fact that 88% of the seed lots were infected with Drechslera; 59% with Fusarium and 52 with S.nodorum. Seeds produced in Brazil had lower germination, lower emergence rate indices, and a higher rat of pathogen transmission to emerging seedlings than counterpart seeds produced in Pullman. Cereal seed produced in Pullman was virtually free of pathogens, indicating an inability of most organisms to persist from one host generation to the next in the dry climate attending crop maturation at Pullman. However, it was revealed for the first time that wheat seed produced under moist conditions of western Washington was sometimes infected with S.nodorum and Pseudomonas syringae. The seedborne phase of s.nodorum was ......... MenosFour hundred kernels of each of 82 imported seed lots were plated on each of three cultural media for the purpose of establishing the sanitary status of ceral seed produced in Brazil. The media were somewhat differential in revealing microorganisms. Of 32,800 seeds plated on potato-dextrose agar, 17,783 yielded a fungus colony. Alternaria spp. and Drechslera spp. were among the most frequently isolated fungi. The blotter method tended to favor the emergence of Cladosporium spp. and Drechdlera spp., while oxgall agar medium permitted the development of Septoria nodorum, Fusarium spp. and Pseudomonas syringae. in general, Brazil-grown seed was heavily laden with pathogens. Barley, with an infection level of 50.5%, was more infested than triticale (43.3%) or wheat (26.6%). Of undoubted significance was the fact that 88% of the seed lots were infected with Drechslera; 59% with Fusarium and 52 with S.nodorum. Seeds produced in Brazil had lower germination, lower emergence rate indices, and a higher rat of pathogen transmission to emerging seedlings than counterpart seeds produced in Pullman. Cereal seed produced in Pullman was virtually free of pathogens, indicating an inability of most organisms to persist from one host generation to the next in the dry climate attending crop maturation at Pullman. However, it was revealed for the first time that wheat seed produced under moist conditions of western Washington was sometimes infected with S.nodorum and Pseudomonas syringae. The s... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Ceral; Cereals; Microrganismos; Sementes; Washington. |
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Thesagro: |
Fungo. |
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Thesaurus Nal: |
Brazil; fungi; microorganisms; seeds. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02400nam a2200277 a 4500
001 1621752
005 1997-07-25
008 1983 bl uuuu m 00u1 u #d
100 1 $aNASSER, L. C. B.
245 $aStudies on microorganisms carried by ceral seeds produced in Brazil and Washington$btheir influence on seedling vigor, chemical and biological control, and histology of Septoria nodorum (Berk.) Berk. on wheat seed
260 $aWashington: Washington State University$c1983
300 $a195p.
490 $aTese de Doutorado.
500 $aTese de Doutorado. Orientada por: J.Water Hendrix.
520 $aFour hundred kernels of each of 82 imported seed lots were plated on each of three cultural media for the purpose of establishing the sanitary status of ceral seed produced in Brazil. The media were somewhat differential in revealing microorganisms. Of 32,800 seeds plated on potato-dextrose agar, 17,783 yielded a fungus colony. Alternaria spp. and Drechslera spp. were among the most frequently isolated fungi. The blotter method tended to favor the emergence of Cladosporium spp. and Drechdlera spp., while oxgall agar medium permitted the development of Septoria nodorum, Fusarium spp. and Pseudomonas syringae. in general, Brazil-grown seed was heavily laden with pathogens. Barley, with an infection level of 50.5%, was more infested than triticale (43.3%) or wheat (26.6%). Of undoubted significance was the fact that 88% of the seed lots were infected with Drechslera; 59% with Fusarium and 52 with S.nodorum. Seeds produced in Brazil had lower germination, lower emergence rate indices, and a higher rat of pathogen transmission to emerging seedlings than counterpart seeds produced in Pullman. Cereal seed produced in Pullman was virtually free of pathogens, indicating an inability of most organisms to persist from one host generation to the next in the dry climate attending crop maturation at Pullman. However, it was revealed for the first time that wheat seed produced under moist conditions of western Washington was sometimes infected with S.nodorum and Pseudomonas syringae. The seedborne phase of s.nodorum was .........
650 $aBrazil
650 $afungi
650 $amicroorganisms
650 $aseeds
650 $aFungo
653 $aBrasil
653 $aCeral
653 $aCereals
653 $aMicrorganismos
653 $aSementes
653 $aWashington
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Embrapa Agrobiologia (CNPAB) |
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