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Registro Completo |
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
06/04/2004 |
Data da última atualização: |
27/07/2007 |
Autoria: |
BIONE, N. C. P.; PAGLIARINI, M. S.; ALMEIDA, L. A. de. |
Título: |
Meiotic mutations causing male sterility in soybean [Glycine max (L.) Merrill]. |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
In: WORLD SOYBEAN RESEARCH CONFERENCE, 7.; INTERNATIONAL SOYBEAN PROCESSING AND UTILIZATION CONFERENCE, 4.; CONGRESSO BRASILEIRO DE SOJA, 3., 2004, Foz do Iguassu. Abstracts of contributed papers and posters. Londrina: Embrapa Soybean, 2004. |
Páginas: |
p. 240-241. |
Série: |
(Embrapa Soja. Documentos, 228).
|
Idioma: |
Inglês |
Notas: |
Editado por Flávio Moscardi, Clara Beatriz Hoffmann-Campo, Odilon Ferreira Saraiva, Paulo Roberto Galerani, Francisco Carlos Krzyzanowski, Mercedes Concordia Carrão-Panizzi. |
Conteúdo: |
Meiosis, a universal process in the life history of sexual organisms, provides opportunities for genetic re-assortment. Molecular data suggest that this process possesses a very conservative set of genes controlling each divisional step. Mutations that selectively eliminate male reproductive function and leave female function unimpaired have potential application in hybrid seed production. Mutations affecting microsporogenesis and causing complete male sterility has been detected in some lines from Embrapa Soybean breeding program. In the line BR97-13777H, many univalents and few bivalents were found in diakinesis. The main and distinctive characteristic of this mutant was the complete inability of univalents to congregate in the metaphase plate. Scattered in the cytoplasm, univalents underwent premature sister chromatid separation, so that 80 chromatids could be easily counted. Telophases II with a varied number of different-sized nuclei were observed. The inability of univalents to congregate at the equator made us classify it as asynaptic mutant. A desynaptic mutation has been detected in BR97-12986H. The meiotic behavior was similar to that described for the st series of synaptic mutants previously reported in soybean. Distinctly different in their behavior from st series soybean mutants, telophase I micronuclei of different sizes organized their own spindle in the second division. This behavior contributed towards an increase in genome fractionation. Several microspores and microcytes of different sizes were recorded at the end of meiosis. A mutation affecting microspore development was detected in the line BR97-13509H. The main cause of male sterility was the absence of cytokinesis after telophase II. Instead of the typical tetrads of microspores four nucleate coenocytic microspores were formed. In the line BR97-17971, analyses of microsporogenesis revealed a differential meiotic behaviour in relation to ms2. Sterile plants have different levels of meiotic abnormalities related to chromosome segregation. The main meiotic cause of pollen sterility was the absent or the defective cytokinesis following telophase II. After telophase II, 1 to 4 nucleate microspores underwent degeneration. Cross-sections of sterile plants showed that at telophase II the tapetal cells with large vacuoles entered degeneration. Despite callose deposition around meiocytes, sterile plants did not form tetrads. They degenerated and collapsed after callose dissolution, forming an amorphous mass. Anthers from male-sterile plants were shrivelled. Up to date, several male-sterile, female fertile soybean mutants have been reported. It is very intriguing why most of them share the same cytological characteristics although they are non-allelic. Studies of genome organisation and linkage could help us to understand better why sterile mutations of independent loci shared the same cytological expressions. MenosMeiosis, a universal process in the life history of sexual organisms, provides opportunities for genetic re-assortment. Molecular data suggest that this process possesses a very conservative set of genes controlling each divisional step. Mutations that selectively eliminate male reproductive function and leave female function unimpaired have potential application in hybrid seed production. Mutations affecting microsporogenesis and causing complete male sterility has been detected in some lines from Embrapa Soybean breeding program. In the line BR97-13777H, many univalents and few bivalents were found in diakinesis. The main and distinctive characteristic of this mutant was the complete inability of univalents to congregate in the metaphase plate. Scattered in the cytoplasm, univalents underwent premature sister chromatid separation, so that 80 chromatids could be easily counted. Telophases II with a varied number of different-sized nuclei were observed. The inability of univalents to congregate at the equator made us classify it as asynaptic mutant. A desynaptic mutation has been detected in BR97-12986H. The meiotic behavior was similar to that described for the st series of synaptic mutants previously reported in soybean. Distinctly different in their behavior from st series soybean mutants, telophase I micronuclei of different sizes organized their own spindle in the second division. This behavior contributed towards an increase in genome fractionation. Several microspores... Mostrar Tudo |
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LEADER 03808naa a2200181 a 4500 001 1466821 005 2007-07-27 008 2004 bl uuuu u00u1 u #d 100 1 $aBIONE, N. C. P. 245 $aMeiotic mutations causing male sterility in soybean [Glycine max (L.) Merrill]. 260 $c2004 300 $ap. 240-241. 490 $a(Embrapa Soja. Documentos, 228). 500 $aEditado por Flávio Moscardi, Clara Beatriz Hoffmann-Campo, Odilon Ferreira Saraiva, Paulo Roberto Galerani, Francisco Carlos Krzyzanowski, Mercedes Concordia Carrão-Panizzi. 520 $aMeiosis, a universal process in the life history of sexual organisms, provides opportunities for genetic re-assortment. Molecular data suggest that this process possesses a very conservative set of genes controlling each divisional step. Mutations that selectively eliminate male reproductive function and leave female function unimpaired have potential application in hybrid seed production. Mutations affecting microsporogenesis and causing complete male sterility has been detected in some lines from Embrapa Soybean breeding program. In the line BR97-13777H, many univalents and few bivalents were found in diakinesis. The main and distinctive characteristic of this mutant was the complete inability of univalents to congregate in the metaphase plate. Scattered in the cytoplasm, univalents underwent premature sister chromatid separation, so that 80 chromatids could be easily counted. Telophases II with a varied number of different-sized nuclei were observed. The inability of univalents to congregate at the equator made us classify it as asynaptic mutant. A desynaptic mutation has been detected in BR97-12986H. The meiotic behavior was similar to that described for the st series of synaptic mutants previously reported in soybean. Distinctly different in their behavior from st series soybean mutants, telophase I micronuclei of different sizes organized their own spindle in the second division. This behavior contributed towards an increase in genome fractionation. Several microspores and microcytes of different sizes were recorded at the end of meiosis. A mutation affecting microspore development was detected in the line BR97-13509H. The main cause of male sterility was the absence of cytokinesis after telophase II. Instead of the typical tetrads of microspores four nucleate coenocytic microspores were formed. In the line BR97-17971, analyses of microsporogenesis revealed a differential meiotic behaviour in relation to ms2. Sterile plants have different levels of meiotic abnormalities related to chromosome segregation. The main meiotic cause of pollen sterility was the absent or the defective cytokinesis following telophase II. After telophase II, 1 to 4 nucleate microspores underwent degeneration. Cross-sections of sterile plants showed that at telophase II the tapetal cells with large vacuoles entered degeneration. Despite callose deposition around meiocytes, sterile plants did not form tetrads. They degenerated and collapsed after callose dissolution, forming an amorphous mass. Anthers from male-sterile plants were shrivelled. Up to date, several male-sterile, female fertile soybean mutants have been reported. It is very intriguing why most of them share the same cytological characteristics although they are non-allelic. Studies of genome organisation and linkage could help us to understand better why sterile mutations of independent loci shared the same cytological expressions. 700 1 $aPAGLIARINI, M. S. 700 1 $aALMEIDA, L. A. de 773 $tIn: WORLD SOYBEAN RESEARCH CONFERENCE, 7.; INTERNATIONAL SOYBEAN PROCESSING AND UTILIZATION CONFERENCE, 4.; CONGRESSO BRASILEIRO DE SOJA, 3., 2004, Foz do Iguassu. Abstracts of contributed papers and posters. Londrina: Embrapa Soybean, 2004.
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Embrapa Soja (CNPSO) |
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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Hortaliças. Para informações adicionais entre em contato com cnph.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
30/08/1999 |
Data da última atualização: |
30/08/1999 |
Autoria: |
SILVA, W. L. C. e. |
Afiliação: |
EMBRAPA-CNPH, Brasilia, DF. |
Título: |
Isolamento de estirpes de Rhizobium phaseoli e Rhizobium luguminosarum em duas cultivares de feijao de vagem e ervilha em solos de cerrado de Brasilia. |
Ano de publicação: |
1979 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE OLERICULTURA, 19., 1979, Florianopolis, SC. Resumos... Florianopolis: EMPASC, 1979. |
Volume: |
v.2. |
Páginas: |
p.277. |
Idioma: |
Português |
Palavras-Chave: |
Adubacao nitrogenada; Brasil; Brasilia; Distrito Federal; Feijao-de-vagem; Innoculation; Pea; Rhizobium luguminosarum; Snap bean. |
Thesagro: |
Cerrado; Ervilha; Inoculação; Phaseolus Vulgaris; Pisum Sativum; Semente. |
Thesaurus NAL: |
Brazil; nitrogen fertilizers; Rhizobium phaseoli; seeds. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01071naa a2200361 a 4500 001 1765267 005 1999-08-30 008 1979 bl uuuu u00u1 u #d 100 1 $aSILVA, W. L. C. e. 245 $aIsolamento de estirpes de Rhizobium phaseoli e Rhizobium luguminosarum em duas cultivares de feijao de vagem e ervilha em solos de cerrado de Brasilia. 260 $c1979 300 $ap.277. v.2. 490 $vv.2. 650 $aBrazil 650 $anitrogen fertilizers 650 $aRhizobium phaseoli 650 $aseeds 650 $aCerrado 650 $aErvilha 650 $aInoculação 650 $aPhaseolus Vulgaris 650 $aPisum Sativum 650 $aSemente 653 $aAdubacao nitrogenada 653 $aBrasil 653 $aBrasilia 653 $aDistrito Federal 653 $aFeijao-de-vagem 653 $aInnoculation 653 $aPea 653 $aRhizobium luguminosarum 653 $aSnap bean 773 $tIn: CONGRESSO BRASILEIRO DE OLERICULTURA, 19., 1979, Florianopolis, SC. Resumos... Florianopolis: EMPASC, 1979.
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