Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae).

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dc.contributorANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC.
dc.creatorMENDES-BONATO, A. B.
dc.creatorPAGLIARINI, M. S.
dc.creatorVALLE, C. B. do
dc.date2023-06-19T20:26:48Z
dc.date2023-06-19T20:26:48Z
dc.date2008-02-01
dc.date2007
dc.date.accessioned2026-07-07T03:42:01Z
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.identifierBrazilian Archives of Biology and Technology, v. 50, n. 5, p. 831-837, Sep. 2007.
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/326408
dc.identifierhttps://doi.org/10.1590/S1516-89132007000500011
dc.identifier.urihttp://hdl.handle.net/123456789/441182
dc.languageeng
dc.rightsopenAccess
dc.subjectApomixia
dc.subjectBrachiaria Decumbens
dc.subjectBrachiaria Ruziziensis
dc.subjectCitogenética Vegetal
dc.subjectEsterilidade
dc.subjectFertilidade
dc.subjectGramínea Forrageira
dc.subjectHibridação
dc.subjectHibrido
dc.subjectMelhoramento Genético Vegetal
dc.subjectPlanta Forrageira
dc.subjectPólen
dc.subjectCell fusion
dc.subjectCytogenetics
dc.subjectHybridization
dc.subjectHybrids
dc.subjectMicrosporogenesis
dc.subjectPlant breeding
dc.subjectPoaceae
dc.subjectPollination
dc.titleMeiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae).
dc.typeArtigo de periódico

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