Meiotic behavior during microsporogenesis of Alchornea triplinervia (Sprengel) Müller Argoviensis

Godoy, Sara Mataroli de; Pereira, Andréia Rodrigues Alonso; Romagnolo, Mariza Barion; Risso-Pascotto, Claudicéia

doi:10.1590/s0103-84782012000600012

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“…Meiosis is a sequence of highly coordinated mechanical, physiological and biochemical events and is controlled by a great number of genes, which culminate in gene recombination and the reduction of the number of chromosomes in gametes (Gottschalk and Kaul 1974;Golubovskaya 1979;Sosnikhina et al 2005;Mercier and Grelon 2008). Meiosis during megaand microsporogenesis has been investigated in several plant species (Mendes-Vieira et al 2005;Risso-Pascotto et al 2009;Souza-Kaneshima et al 2010;Vesselina and Mateus-Andrés 2010;Olkoski and Schifino-Wittmann 2011;Papini et al 2011;Godoy et al 2012;Paiva et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Complex of pollen mother cell and polyad production during microsporogenesis in Hippocratea volubilis (Hippocrateaceae)

et al. 2012

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Cytogenetic studies are a useful tool for the study of systematics and evolution in plants. The current paper reports on polyad production during microsporogenesis of Hippocratea volubilis. The analyzed material was collected in the Ecological Station of Caiuá in Diamante do Norte, PR, Brazil. The meiotic analysis was performed using a squashing technique and the stain was 1% acetic carmine. The chromosome segregation process during meiotic division was normal. However, pollen mother cells (PMCs) were bonded in fours or twos, through cytoplasmic channels during the whole microsporogenesis. After telophase II, four-PMC complexes produced tetra-tetrads with 16 microspores, whereas two-PMC complexes produced bi-tetrads with eight microspores. Microspores formed in the process remained bonded and formed polyads with 16 or eight pollen grains.

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