Breakdown of the classical meiotic system in Rhoeo spathacea (Commelinaceae).

Verma, S. C.; Ohri, Deepak

doi:10.1508/cytologia.44.91

Cited by 10 publications

(9 citation statements)

References 21 publications

(6 reference statements)

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“…Predominant non-disjunctional orientation in the present case as also reported in Rhoeo spathacea (Verma and Ohri 1979) may be the mechanical consequence of occurrence of chi asmata in interstitial/differential segments, because multiples with chiasmata in these segments are liable to be less flexible than those with terminal chiasmata. The orientation of multiple , however, could not be correlated with physical characteristics of chromosomes and/or interstiti al chiasma formation in case of interchange heterozygotes of Sesbania aegyptiaca (Zadoo 1987).…”

Section: Discussionsupporting

confidence: 71%

Multiple chromosome interchanges involving whole complement in Sesbania aculeata Poir.

Parihar

Zadoo

1989

CYTOLOGIA

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Section: Discussionsupporting

confidence: 71%

Multiple chromosome interchanges involving whole complement in Sesbania aculeata Poir.

Parihar

Zadoo

1989

CYTOLOGIA

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“…King and Hayman (1978) reported a seasonal variation of chiasma frequency in lizards. As far as the effect of temperature on chiasma frequency in Tradescantia is concerned, while Lin (1982a) reported a significant reduction in chiasma frequency on prolonged exposure to high temperature, Verma and Ohri (1979) did not observe any correlation between temperature and chain formation. The only report that more-or-less supports our observations is that of Raghuvanshi and Chauhan (1970), who reported an increase in univalent frequency in Tabernaemontana divaricata at low temperature.…”

Section: Discussionmentioning

confidence: 99%

“…Such structures are the result of interchanges between all the 12 chromosomes of the complement with each chromosome sharing partial homology with two others without altering the chromosome number. Owing to its atypical chromosome behavior this plant has been studied extensively for karyotype (Darlington 1929(Darlington , 1938Kato 1930;Sax 1931;Sax and Anderson 1933;Coleman 1941;Lin and Paddock 1973;Golcyzk et al 2005), C-banding (Natrajan and Natrajan 1972;Pettanati 1987;Pattankar andRanjekar 1988, Golcyzk andJoachimiak 1999), arrangement of AT-GC rich chromatin, NORs, 5s and 45s rDNA (Golczyk and Joachimiak 2003, 2008, Golczyk et al 2010Golczyk 2011aGolczyk , 2011b) and the meiotic behavior of chromosomes (Belling 1927;Kato 1930;Koller 1932;Akemine 1937;Bhaduri 1942;Simmonds 1945;Walters and Gerstel 1948;Desai 1965;Wimber 1968;Moens 1972;Satterfield and Mertens 1972;Mertens 1973;Lin 1979aLin , 1979bLin , 1980Lin , 1982aLin , 1982bLin and Paddock 1973;Lin and Lee 1979;Verma and Ohri 1979;Jahan and Vahidy 1994;K...…”

Section: Introductionmentioning

confidence: 99%

“…diakinesis, and details regarding the behavior of chromosomes at metaphase I, supported by good photomicrographs, have been more-or-less lacking. The only accounts available of metaphase I chromosomes are from Satterfield and Mertens (1972), Mertens (1973), Verma and Ohri (1979), Lin (1980Lin ( , 1982aLin ( , 1982b, Jahan and Vahidi (1994) and Koul et al (2011). The main impediment hampering the detailed study at this stage has been the extensive condensation and clumping of chromosomes into small masses.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variable multivalent orientations during diakinesis and metaphase I in microsporocytes ofTradescantia spathaceaSw.

Koul¹,

Nagpal²,

Kumar

2013

Caryologia

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Meiotic studies carried out on seven plants/clones of Tradescantia spathacea did not show the expected ring of 12 chromosomes in any of the 1765 cells studied at diakinesis (1202 cells) and metaphase I (563 cells). While at diakinesis the chromosomes resolved into chain configurations of all lengths ranging from one through 12 chromosomes, with the mean per cell being 2.47 ± 1.28, at metaphase I chains carrying up to 10 chromosomes were seen and the mean per cell was 4.18 ± 1.47. However, the larger chains were not the most frequent configurations observed at the two stages. Bivalents and univalents were the most frequent configurations observed in 38.68 and 43.92% cells at diakinesis and 63.94 and 57.72% cells at metaphase I, followed by chains of 10 (29.95% cells) and chains of three (51.50% cells) at the two stages, respectively. The larger chains, though visible at both the meiotic stages, varied significantly in the centromere orientation patterns. While at diakinesis they predominantly showed linear or indifferent orientation, at metaphase I 83.25% chains showed alternate orientation, with the rest showing linear and/or indifferent orientation. A high frequency of alternate orientation was observed in chains of three chromosomes (93.93%), followed by the chains of five and four, where 74.19 and 71.27% chains appeared in alternate orientation, respectively. In 4.97% cells with two chains of six chromosomes each, contrasting behavior was noticed in the two chains in respect of orientation. While one chain appeared zigzagged with alternate centromeres facing the same pole, the other chain invariably appeared in linear configuration. As a result of complex configurations at metaphase I and the high frequency of univalents, anaphase I segregation of chromosomes was highly irregular with 84% cells showing 1-3 lagging chromosomes. The average pollen viability determined for the seven clones studied was very low (17.87 ± 2.57%). The probable cause(s) of the different behaviors of the chain multiples at the two meiotic stages is discussed.

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“…Such a complex phenomenon is on record in some species of Oenothera [3], Rhoeo spathacea [27] and Pennisetum americannum [26]. In Alliums, translocation heterozygotes have also been observed in a few other species, besides A. roylei.…”

Section: Discussionmentioning

confidence: 99%

Is Allium roylei Stearn still evolving through multiple interchanges?

Kohli

Gohil

2011

Nucleus

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An accession of A. roylei (2n=16) procured from Gourwan district Udhampur of Jammu and Kashmir, India was studied for cytological details. Complex associations involving 4-16 chromosomes were observed in cells at diplotene and metaphase-I of meiosis. The anaphase-I segregations, however, were normal (8:8). Pollen stainability was high. Karyotypic studies, besides revealing heteromorphicity in chromosome pairs, also showed considerable differences in other quantitative parameters. Since frequency and type of chromosome associations during meiosis outnumber the number of heteromorphic chromosome pairs, interchanges involving small size or equal segments seem to have given rise to this cytotype of A. roylei.

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Breakdown of the classical meiotic system in Rhoeo spathacea (Commelinaceae).

Cited by 10 publications

References 21 publications

Multiple chromosome interchanges involving whole complement in Sesbania aculeata Poir.

Multiple chromosome interchanges involving whole complement in Sesbania aculeata Poir.

Variable multivalent orientations during diakinesis and metaphase I in microsporocytes ofTradescantia spathaceaSw.

Is Allium roylei Stearn still evolving through multiple interchanges?

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