Secondary association of bivalents in Cissus discolor Blume.

Agarwal, Poonam

doi:10.1508/cytologia.48.577

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…In Cissus, occurrence of chromosome number n=12, 48 and 2n=24 confirms the earlier reports [2,17,19,20,26,28,29]. Chromosome number 2n=44 and 52 were recorded in Tetrastigma which is in conformity with the earlier report [1,17,19,20,26], however a different number of 2n=22 has also been reported in Tetrastigma sulcatum [17,19].…”

Section: Resultssupporting

confidence: 90%

Cyto–morphological studies and their significance in evolution of family Vitaceae

Karkamkar

Patil

Misra

2010

Nucleus

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Cyto-morphology and chromosome number worked out for 60 accessions belonging to genera and species of the family Vitaceae show marked variations in their chromosome numbers. Grape cultivars and Vitis species have 2n=38, while in wild types like Ampelopsis, Ampelocissus and Parthenocissus 2n=40 and 80 were encountered. Chromosome numbers of Cissus, Cayratia and Tetrastigma have variations from 2n=22 to 120. These genera have been reclassified based on chromosome numbers like Cissus 2n=24, 48, Cayratia 2n=40, 80, 60 and 120, and Tetrastigma to be 2n=22, 44, 26, 52.

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Section: Resultssupporting

confidence: 90%

Cyto–morphological studies and their significance in evolution of family Vitaceae

Karkamkar

Patil

Misra

2010

Nucleus

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“…Malgwi et al (1997) were of the opinion that secondary associations of bivalents may be the outcome of residual pairing potential of those segments that could not achieve normal synapsis at zygotene but were sufficiently identical to attract each other without the formation of chiasmata. Secondary association of chromosomes was first reported by Kuwada (1910) in Oryza sativa followed by Ishikawa (1911) in Dahlia variabilis and since then were often encountered in meiotic processes of plant species in tracing basic chromosome numbers and the polyploidy nature of the species (Riley 1960, Kempanna and Riley 1964, Sharma and Chatterjee 1966, Gupta and Roy 1973, Agarwal 1983, Sengupta and Datta 2002, 2003, Mukherjee and Datta 2005, Iqbal and Datta 2006. The present investigation describes meiotic chromosome behavior documenting secondary chromosome association in Uraria picta (Jacq.)…”

mentioning

confidence: 57%

Secondary Chromosome Associations in Uraria picta (Jacq.) DC (Family: Leguminosae)

Bhattacharya

Datta

2010

CYTOLOGIA

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SummaryThe meiocytes of Uraria picta (Jacq.) DC (Family: Leguminosae; Papillionoide; annual medicinal herb) had nϭ11 chromosomes with an average chromosomal association of 0.11 IVϩ10.29 IIϩ0.98 I per cell at diakinesis and metaphase I. The bivalents formed rods (rods: 1-11/cell, 6.95Ϯ0.22; rings: 0-9/cell, 3.59Ϯ0.25/cell) mostly at MI with mean chiasma of 14.22Ϯ 0.24 (8 to 20) per cell. Formation of 11 II in PMCs was predominant (62.71%). About 11.25% of the cells had a ring quadrivalent. All AI cells were cytologically balanced (11/11) with an average pollen fertility of 97.58%. A persistant feature in 100% diakinesis and MI cells was the presence of secondary association of chromosomes and the chromosomes assorted themselves into variable groups of 2 (0.85%), 3 (5.08%), 4 (7.63%), 5 (11.86%), 6 (42.37%), 7 (19.49%), 8 (3.39%), 9 (2.54%) and 11 (1.69%). Out of 52 different chromosomal associations among the group classes, 3 II(1)ϩ2 II(3)ϩ1 II(2)Ϫ16.10% (6 group class) was most frequent.Key words Basic chromosome number, Meiosis, Secondary association of chromosomes, Uraria picta.Pairs of bivalents and univalents lying in close proximity but always without any distinct material connections were referred to as secondary associations or secondary pairings of chromosomes (Darlington 1965). Stebbins (1950) considered these associations to be the result of modified chromosome rearrangements such as duplications, interchanges, etc.; while Jelenkovic et al. (1980) attributed it to the mode of heterochromatin distribution in the genome which possibly facilitates the alignment and synapsis of nonhomologus regions. Malgwi et al. (1997) were of the opinion that secondary associations of bivalents may be the outcome of residual pairing potential of those segments that could not achieve normal synapsis at zygotene but were sufficiently identical to attract each other without the formation of chiasmata. Secondary association of chromosomes was first reported by Kuwada (1910) in Oryza sativa followed by Ishikawa (1911) in Dahlia variabilis and since then were often encountered in meiotic processes of plant species in tracing basic chromosome numbers and the polyploidy nature of the species

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“…Since then, it is often encountered in meiotic processes of different plant species in tracing basic chromosome numbers and the polyploid nature of the species (Kempanna and Riley 1964, Gupta and Roy 1973, Agarwal 1983, Sengupta and Datta 2003, Mukherjee and Datta 2005, Iqbal and Datta 2007, Das et al 2009, Bhattacharya and Datta 2010, Mandal and Datta 2011, Halder et al 2012, Kumar and Singhal 2013. The present investigation describes meiotic configurations documenting secondary chromosome association in Indigofera tinctoria L. (Family: Fabaceae), an annual, biennial, or perennial shrub, based on the climate under which it is grown (Gaboriaud- Kolar et al 2014).…”

mentioning

confidence: 87%

Meiotic Configurations and Secondary Chromosome Associations in <i>Indigofera tinctoria</i> L. (Family: Fabaceae)

Ghosh

Datta

Mandal³

et al. 2016

CYTOLOGIA

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Summary Meiotic analysis performed in Indigofera tinctoria L. (Family: Fabaceae) reveals n=8 chromosomes with an average chromosomal association of 7.79II+0.44I at metaphase I (MI). Predominance of 8II formation (87.86%) has been noted. The bivalents form rods (mean per cell -rod: 5.88 0.21; ring: 1.87 0.19; association: 7.75II+0.50I) mostly at diplotene with a mean chiasma of 9.62 0.21 per cell. Anaphase I cells (94.12%) are mostly cytologically balanced (8/8) with an average pollen fertility of 93.60%. A persistent feature (89.39%) in MI cells has been the presence of secondary association of chromosomes and the chromosomes assort themselves into variable groups of two (6.04%), three (7.04%), four (25.50%), five (56.71%), six (4.02%) and seven (0.67%). Out of 25 different associations studied among the group classes, 3II(1)+2II(1)+1II(3) under the five group class (25.83%) was the most frequent. Statistical analysis of cytological data reveals that the probable basic chromosome number in the species is x=5, suggesting polyploid lineage.

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Secondary association of bivalents in Cissus discolor Blume.

Cited by 10 publications

References 14 publications

Cyto–morphological studies and their significance in evolution of family Vitaceae

Cyto–morphological studies and their significance in evolution of family Vitaceae

Secondary Chromosome Associations in Uraria picta (Jacq.) DC (Family: Leguminosae)

Meiotic Configurations and Secondary Chromosome Associations in <i>Indigofera tinctoria</i> L. (Family: Fabaceae)

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