Mixed first and second division restitution in male meiosis of Hierochloë odorata (L.) Beauv (Holy Grass)

Callow, R. S.; Gray, Alan

doi:10.1038/hdy.1992.90

Cited by 12 publications

(8 citation statements)

References 34 publications

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“…1m-p). Similar mechanism was reported in Hierochloë odorata, a rhizomatous perennial grass (Ferris et al 1992). The number of affected cells in each accession was variable, but the number of microspores with restitutional nuclei, including those scored in tetrads and the released ones, did not exceed 9%.…”

Section: Resultsmentioning

confidence: 52%

2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae)

et al. 2006

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Microsporogenesis of several Brachiaria species of the Brazilian collection at Embrapa Beef Cattle has been analyzed in detail. This paper reports abnormal cytokinesis in three accessions of three different species (Brachiaria humidicola, 2n = 4x = 36, Brachiaria decumbens, 2n = 4x = 36, and Brachiaria dura, 2n = 6x = 54). Chromosomes paired in bi-, tri-, and quadrivalents in these accessions, whereas chromosome segregation at meiosis I was characterized by exclusion of laggards as micronuclei. In a high number of meiocytes, the first sign of cytokinesis appeared only in metaphase II and did not divide the meiocyte into a dyad. Total absence of cytokinesis was also detected among meiocytes in the second division. Since in both cases the two metaphase plates were very close, they favored the rejoining of chromosome sets after anaphase II and formed a restitutional nucleus in telophase II. Second cytokinesis occurred after telophase II in most meiocytes. Monads, dyads, and triads with n or 2n nuclei were observed among meiotic products. The 2n gametes observed correspond to the first division restitution (FDR). The number of affected cells in each accession was variable, but the number of microspores with restitutional nucleus, including those scored in tetrads and the released ones, did not exceed 9%. Although polyploidy is common in the genus Brachiaria, its origin is still unclear. Current results suggest that 2n gametes may have contributed to the evolutionary history of the genus.

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Section: Resultsmentioning

confidence: 52%

2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae)

et al. 2006

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“…Single chromatids lagging at anaphase II may appear in both normal, and unreduced second division cells since it is possible that, even in those cells collapsing at anaphase I, some univalents complete equational segregation. Restitution at the second division has been found in plants forming univalents (García-Velázquez 1991) and, in some cases, restitution has been reported to occur in both meiotic divisions, producing a wide range of ploidy levels (Ferris et al 1992).…”

Section: Discussionmentioning

confidence: 99%

Active role of lagging chromosomes in spindle collapse as revealed by live phase contrast and tubulin immunostaining in grasshopper spermatocytes

Rebollo

Arana

2001

Chromosoma

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Univalents, that is, chromosomes lacking an attached partner at the first meiotic division, show extremely faulty transmission. Most segregational errors stem from amphitelic (mitotic-like) orientation at metaphase I followed by anaphase I lagging. Our studies in living grasshopper spermatocytes show that amphitelic orientation may provoke spindle collapse: spindle elongation and cytokinesis are impaired and an unreduced restitution nucleus is formed. This does not prevent meiotic progression and eventually leads to the production of diploid gametes. The morphology and characteristics of spindle collapse in our material, as revealed by in vivo observation and tubulin immunostaining, indicate an active role of the chromosomes in the whole process.

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“…It should be noted that the possibility of obtaining diploid spore formation at low temperatures could facilitate allopolyploid hybrid formation, with the resulting restoration of fertility (Maan and Sasakuma 1977, Stefani 1986, Ferris et al 1991, Fukuda and Sakamoto 1992.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Temperature on Meiosis and Microspores Development in Dasypyrum villosum (L.) P. Candargy.

Stefani

Colonna

1996

CYTOLOGIA

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Mixed first and second division restitution in male meiosis of Hierochloë odorata (L.) Beauv (Holy Grass)

Abstract: Mixed first and second division restitution in male meiosis of Hierochloe odorata (L.

Cited by 12 publications

References 34 publications

2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae)

2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae)

Active role of lagging chromosomes in spindle collapse as revealed by live phase contrast and tubulin immunostaining in grasshopper spermatocytes

The Influence of Temperature on Meiosis and Microspores Development in Dasypyrum villosum (L.) P. Candargy.

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