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121. | | ASSIS, T. E.; BARRIOS, S. C. L.; VALLE, C. B. do; JANK, L.; SANTOS, M. F. Distinguibilidade de cultivares de Brachiaria para características vegetativas e reprodutivas. In: WORKSHOP MELHORAMENTO VEGETAL: CONTRIBUIÇÕES, AVANÇOS E PERSPECTIVAS PARA O CERRADO BRASILEIRO, 2., 2016. Anais... Campo Grande, MS: SBMP, 2016. Publicado também na 12ª Jornada Científica da Embrapa Gado de Corte. Biblioteca(s): Embrapa Gado de Corte. |
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123. | | CHIARI, L.; BITENCOURT, G. de A.; VALLE, C. B. do; JANK, L. Extração de RNA de folhas e raízes de Brachiaria decumbens e Panicum maximum In: INTERNATIONAL SYMPOSIUM ON FORAGE BREEDING, 3., 2011, Bonito, MS. Breeding forage for climate change adaptation and mitigation - eco-efficient animal produtction: proceedings. [Campo Grande, MS: Embrapa Gado de Corte], 2011. 163-166 1 CD-ROM Biblioteca(s): Embrapa Gado de Corte. |
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125. | | FERNANDES, F. D.; CARVALHO, M. A.; RAMOS, A. K. B.; GUIMARAES JUNIOR, R.; JANK, L. Evaluating panicum maximum as an energy crop: biomass productivity. SIMPÓSIO INTERNACIONAL SOBRE MELHORAMENTO DE FORRAGEIRAS, 2., 2009, Campo Grande, MS. Anais... Campo Grande, MS: Embrapa Gado de Corte, 2009. 1 CD-ROM. Biblioteca(s): Embrapa Cerrados. |
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129. | | GOMES, R. A.; LEMPP, B.; JANK, L.; CARPEJANI, G. C.; MORAES, M. da G. Correlações lineares entre características anatômicas, morfofisiológicas, químicas e biológicas de lâminas foliares de genótipos de Panicum maximum. In: SIMPÓSIO, 7.; CONGRESSO DE FORRAGICULTURA E PASTAGENS, 3., 2009, Lavras. Anais... Lavras: UFLA, 2009. 3 p. 1 CD-ROM. Biblioteca(s): Embrapa Gado de Corte. |
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131. | | AMORIM, T. R; SILVA, M. J. da; FERNANDES, C. D.; JANK, L.; MEIRELES, K. G. X. Avaliação de genótipos de Panicum maximum quanto à resistência a Bipolaris maydis. In: INTERNATIONAL SYMPOSIUM ON FORAGE BREEDING, 3., 2011, Bonito, MS. Breeding forage for climate change adaptation and mitigation - eco-efficient animal produtction: proceedings. [Campo Grande, MS: Embrapa Gado de Corte], 2011. 254-257 1 CD-ROM Biblioteca(s): Embrapa Gado de Corte. |
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132. | | JANK, L.; SAVIDAN, Y. H.; SOUZA, M. T. de; COSTA, J. C. G. Avaliação do germoplasma de Panicum maximum introduzido da Africa. 1. Produção forrageira. Revista da Sociedade Brasileira de Zootecnia, Viçosa, MG, v.23, n.3, p.433-440, maio/jun. 1994. Biblioteca(s): Embrapa Gado de Corte. |
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135. | | RESENDE, C. F. DE; JANK, L.; ARRUDA, L. A. R.; CRUZ, T. T.; SANTOS, M. F. Avaliação de híbridos selecionados de Panicum maximum em Mato Grosso do Sul. In: JORNADA CIENTÍFICA EMBRAPA GADO DE CORTE, 10., 2014, Campo Grande, MS. [Anais da..]. Campo Grande, MS: Embrapa Gado de Corte, 2014. p. 30-31. 2 p. (Embrapa Gado de Corte. Documentos, 208). Comissão organizadora: Grácia Maria Soares Rosinha, Alexandra Rocha de Oliveir, Rodrigo Carvalho Alva. Biblioteca(s): Embrapa Gado de Corte. |
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136. | | JANK, L.; VALLE, C. B. do; RESENDE, R. M. S.; CHIARI, L. Banco ativo de germoplasma de Panicum maximum JACQ.: forrageira tropical de alta produtividade. In: CONGRESSO BRASILEIRO DE RECURSOS GENÉTICOS; WORKSHOP EM BIOPROSPECÇÃO E CONSERVAÇÃO DE PLANTAS NATIVAS DO SEMI-ÁRIDO, 3.; WORKSHOP INTERNACIONAL SOBRE BIOENERGIA E MEIO AMBIENTE, 2010, Salvador. Bancos de germoplasma: descobrir a riqueza, garantir o futuro: anais. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2010. 550 p. (Embrapa Recursos Genéticos e Biotecnologia. Documentos, 304). Editora técnica Clara Oliveira Goedert. p. 160 Biblioteca(s): Embrapa Gado de Corte. |
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137. | | RAGALZI, G. de M.; RAGALZI, C. M.; JANK, L.; SANTOS, M. F. Avaliação de caracteres agronômicos de Panicum maximum Jacq. em diferentes ambientes dentro da Embrapa Gado de Corte. In: JORNADA CIENTÍFICA EMBRAPA GADO DE CORTE, 15., 2019, Campo Grande, MS. [Resumos dos trabalhos...]. Brasília, DF: Embrapa, 2019 80 p. (Embrapa Gado de Corte. Documentos, 264). Comitê Organizador: Marlene de Barros Coelho; Lenita Ramires dos Santos; Rodrigo Carvalho Alva; Lucimara Chiari; Thais Basso Amaral. 36-37 Biblioteca(s): Embrapa Gado de Corte. |
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139. | | SOUZA, S. M. L. de; JANK, L.; SANTOS, M. F.; LAURA, V. A. Avaliação de dois genótipos e duas cultivares de Megathyrsus maximus ao estresse hídrico sob polietileno glicol 6000 (peg-6000). In: JORNADA CIENTÍFICA EMBRAPA GADO DE CORTE, 14., 2018, Campo Grande - MS. [Resumos dos trabalhos]. Brasília, DF, Embrapa, 2018 115 p. (Embrapa Gado de Corte. Documentos, 258). p. 102-103 Biblioteca(s): Embrapa Gado de Corte. |
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140. | | RAGALZI, C. M.; RESENDE, R. M. S.; VILELA, M. de M.; VENTURA, E. F.; JANK, L. Associação genômica ampla na seleção para apomixia em Panicum maximum jacq. In: JORNADA CIENTÍFICA EMBRAPA GADO DE CORTE, 11., 2015, Campo Grande, MS. Anais... Campo Grande: Embrapa Gado de Corte, 2015. 114 p. (Embrapa Gado de Corte. Documentos, 213). Biblioteca(s): Embrapa Gado de Corte. |
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Registros recuperados : 533 | |
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Registro Completo
Biblioteca(s): |
Embrapa Gado de Corte. |
Data corrente: |
30/09/2009 |
Data da última atualização: |
13/10/2009 |
Autoria: |
RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do; JANK, L. |
Afiliação: |
C. RISSO-PASCOTTO, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC; LIANA JANK, CNPGC. |
Título: |
Symmetric pollen mitosis I and suppression of pollen mitosis II prevent pollen development in Brachiaria jubata (Gramineae). |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v.38, n.11, p. 1603-1608, nov. 2005. |
Idioma: |
Português |
Conteúdo: |
Microsporogenesis and pollen development were analyzed in a tetraploid (2n = 4x = 36) accession of the forage grass Brachiaria jubata
(BRA 007820) from the Embrapa Beef Cattle Brachiaria collection that showed partial male sterility. Microsporocytes and pollen grains
were prepared by squashing and staining with 0.5% propionic carmine. The meiotic process was typical of polyploids, with precocious
chromosome migration to the poles and laggards in both meiosis I and II, resulting in tetrads with micronuclei in some microspores. After
callose dissolution, microspores were released into the anther locule and appeared to be normal. Although each microspore initiated its
differentiation into a pollen grain, in 11.1% of them nucleus polarization was not observed, i.e., pollen mitosis I was symmetric and the
typical hemispherical cell plate was not detected. After a central cytokinesis, two equal-sized cells showing equal chromatin condensation
and the same nuclear shape and size were formed. Generative cells and vegetative cells could not be distinguished. These cells did
not undergo the second pollen mitosis and after completion of pollen wall synthesis each gave rise to a sterile and uninucleate pollen grain.
The frequency of abnormal pollen mitosis varied among flowers and also among inflorescences. All plants were equally affected. The
absence of fertile sperm cells in a considerable amount of pollen grains in this accession of B. jubata may compromise its use in breeding and
could explain, at least in part, why seed production is low when compared with the amount of flowers per raceme. MenosMicrosporogenesis and pollen development were analyzed in a tetraploid (2n = 4x = 36) accession of the forage grass Brachiaria jubata
(BRA 007820) from the Embrapa Beef Cattle Brachiaria collection that showed partial male sterility. Microsporocytes and pollen grains
were prepared by squashing and staining with 0.5% propionic carmine. The meiotic process was typical of polyploids, with precocious
chromosome migration to the poles and laggards in both meiosis I and II, resulting in tetrads with micronuclei in some microspores. After
callose dissolution, microspores were released into the anther locule and appeared to be normal. Although each microspore initiated its
differentiation into a pollen grain, in 11.1% of them nucleus polarization was not observed, i.e., pollen mitosis I was symmetric and the
typical hemispherical cell plate was not detected. After a central cytokinesis, two equal-sized cells showing equal chromatin condensation
and the same nuclear shape and size were formed. Generative cells and vegetative cells could not be distinguished. These cells did
not undergo the second pollen mitosis and after completion of pollen wall synthesis each gave rise to a sterile and uninucleate pollen grain.
The frequency of abnormal pollen mitosis varied among flowers and also among inflorescences. All plants were equally affected. The
absence of fertile sperm cells in a considerable amount of pollen grains in this accession of B. jubata may compromise its use in breeding and
c... Mostrar Tudo |
Palavras-Chave: |
Brachiaria jubata; Braquiária; Microsporogênese. |
Thesagro: |
Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
Marc: |
LEADER 02366naa a2200229 a 4500 001 1512794 005 2009-10-13 008 2005 bl --- 0-- u #d 100 1 $aRISSO-PASCOTTO, C. 245 $aSymmetric pollen mitosis I and suppression of pollen mitosis II prevent pollen development in Brachiaria jubata (Gramineae). 260 $c2005 520 $aMicrosporogenesis and pollen development were analyzed in a tetraploid (2n = 4x = 36) accession of the forage grass Brachiaria jubata (BRA 007820) from the Embrapa Beef Cattle Brachiaria collection that showed partial male sterility. Microsporocytes and pollen grains were prepared by squashing and staining with 0.5% propionic carmine. The meiotic process was typical of polyploids, with precocious chromosome migration to the poles and laggards in both meiosis I and II, resulting in tetrads with micronuclei in some microspores. After callose dissolution, microspores were released into the anther locule and appeared to be normal. Although each microspore initiated its differentiation into a pollen grain, in 11.1% of them nucleus polarization was not observed, i.e., pollen mitosis I was symmetric and the typical hemispherical cell plate was not detected. After a central cytokinesis, two equal-sized cells showing equal chromatin condensation and the same nuclear shape and size were formed. Generative cells and vegetative cells could not be distinguished. These cells did not undergo the second pollen mitosis and after completion of pollen wall synthesis each gave rise to a sterile and uninucleate pollen grain. The frequency of abnormal pollen mitosis varied among flowers and also among inflorescences. All plants were equally affected. The absence of fertile sperm cells in a considerable amount of pollen grains in this accession of B. jubata may compromise its use in breeding and could explain, at least in part, why seed production is low when compared with the amount of flowers per raceme. 650 $aGramínea Forrageira 650 $aMelhoramento Genético Vegetal 650 $aPastagem 653 $aBrachiaria jubata 653 $aBraquiária 653 $aMicrosporogênese 700 1 $aPAGLIARINI, M. S. 700 1 $aVALLE, C. B. do 700 1 $aJANK, L. 773 $tBrazilian Journal of Medical and Biological Research, Ribeirão Preto$gv.38, n.11, p. 1603-1608, nov. 2005.
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