Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/326408
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Campo DCValorIdioma
dc.contributor.authorMENDES-BONATO, A. B.
dc.contributor.authorPAGLIARINI, M. S.
dc.contributor.authorVALLE, C. B. do
dc.date.accessioned2023-06-19T20:26:48Z-
dc.date.available2023-06-19T20:26:48Z-
dc.date.created2008-02-01
dc.date.issued2007
dc.identifier.citationBrazilian Archives of Biology and Technology, v. 50, n. 5, p. 831-837, Sep. 2007.
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/326408-
dc.descriptionMicrosporogenesis was analyzed in an interspecific hybrid between an artificially tetraploidized sexual accession of Brachiaria ruziziensis (2n=4x=36) and a natural apomictic tetraploid accession of B. decumbens. Syncytes involving a large number of cells were recorded in 15.4% of meiocytes. Meiosis progressed normally in syncytes during prophase I; in metaphase I, however, several nuclei were found fusioned, showing chromosome stickiness and several chromosome fragments. Meiosis was arrested in metaphase I and pycnotic nuclei and micronuclei were formed. Abnormal cytokinesis fractionated the syncyte into abnormal meiotic products that were covered by the pollen wall. Meiocytes in leptotene were recorded in all the slides prepared for both meiotic divisions, and abnormal ?pollen grains? with well-developed pollen wall but containing leptotene nuclei were recorded in 9.18% of grains analyzed. These findings suggested that the meiocytes received the signal to enter meiosis but lacked the signal to proceed beyond leptotene. Despite the absence of the meiotic process, such cells were covered by pollen grain wall. Total pollen sterility resulted from these abnormalities combined with still others observed among meiocytes.
dc.language.isoeng
dc.rightsopenAccess
dc.titleMeiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae).
dc.typeArtigo de periódico
dc.subject.thesagroApomixia
dc.subject.thesagroBrachiaria Decumbens
dc.subject.thesagroBrachiaria Ruziziensis
dc.subject.thesagroCitogenética Vegetal
dc.subject.thesagroEsterilidade
dc.subject.thesagroFertilidade
dc.subject.thesagroGramínea Forrageira
dc.subject.thesagroHibridação
dc.subject.thesagroHibrido
dc.subject.thesagroMelhoramento Genético Vegetal
dc.subject.thesagroPlanta Forrageira
dc.subject.thesagroPólen
dc.subject.nalthesaurusCell fusion
dc.subject.nalthesaurusCytogenetics
dc.subject.nalthesaurusHybridization
dc.subject.nalthesaurusHybrids
dc.subject.nalthesaurusMicrosporogenesis
dc.subject.nalthesaurusPlant breeding
dc.subject.nalthesaurusPoaceae
dc.subject.nalthesaurusPollination
riaa.ainfo.id326408
riaa.ainfo.lastupdate2023-06-19
dc.identifier.doihttps://doi.org/10.1590/S1516-89132007000500011
dc.contributor.institutionANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC.
Aparece nas coleções:Artigo em periódico indexado (CNPGC)

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