Chromosome Numbers in the Phaseoleae (Fabaceae: Faboideae) and their Relation to Taxonomy

Lackey, James Alden

doi:10.2307/2442301

Cited by 53 publications

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“…Soybean (Glycine max) is considered a paleopolyploid. Cytogenetic studies have provided proof of ancient polyploidy events in soybean and have reported a unique chromosome number for Glycine among other members of the Phaseoleae (Hadley and Hymowitz, 1973;Lackey, 1980). In addition, fluorescence in situ hybridization analyses using bacterial artificial chromosomes (BACs) have allowed the identification of segmental duplications and chromosome-level homeology within the soybean genome (Pagel et al, 2004;Walling et al, 2006).…”

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Dynamic Rearrangements Determine Genome Organization and Useful Traits in Soybean

et al. 2009

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Soybean (Glycine max) is a paleopolyploid whose genome has gone through at least two rounds of polyploidy and subsequent diploidization events. Several studies have investigated the changes in genome structure produced by the relatively recent polyploidy event, but little is known about the ancient polyploidy due to the high frequency of gene loss after duplication. Our previous study, regarding a region responsible for bacterial leaf pustule, reported two homeologous Rxp regions produced by the recent whole-genome duplication event. In this study, we identified the full set of four homeologous Rxp regions (ranging from 1.96 to 4.60 Mb) derived from both the recent and ancient polyploidy events, and this supports the quadruplicated structure of the soybean genome. Among the predicted genes on chromosome 17 (linkage group D2), 71% of them were conserved in a recently duplicated region, while 21% and 24% of duplicated genes were retained in two homeologous regions formed by the ancient polyploidy. Furthermore, comparative analysis showed a 2:1 relationship between soybean and Medicago truncatula, since M. truncatula did not undergo the recent polyploidy event that soybean did. Unlike soybean, M. truncatula homeologous regions were highly fractionated and their synteny did not exist, revealing different rates of diploidization process between the two species. Our data show that extensive synteny remained in the four homeologous regions in soybean, even though the soybean genome experienced dynamic genome rearrangements following paleopolyploidy events. Moreover, multiple Rxp quantitative trait loci on different soybean chromosomes actually comprise homeologous regions produced by two rounds of polyploidy events.

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Dynamic Rearrangements Determine Genome Organization and Useful Traits in Soybean

et al. 2009

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“…Chromosome counts in the members of Phaseoleae show a predominance of base numbers (x) of 10 or 11 except for Oxyrhynchus, which has a base number of 12 (Lackey 1980). Nesphostylis bracteata with 2n =20 has a base number of 10.…”

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confidence: 99%

“…Mitotic chromosome studies in different accessions of Sphenostylis stenocarpa have also shown that the diploid number ranges between 2n =20 to 24 (Adesoye and Nnadi 2011). In the subtribe Diocleinae, Galactia and Collaea exhibit 2n =20 (Lackey 1980, Sede et al 2003, Espert et al 2008. Hence, it can be construed that the base number of 10 is not uncommon in Phaseoleae, although 2n =22 is most frequent.…”

Section: Resultsmentioning

confidence: 99%

Mitotic Chromosome Studies in <i>Nesphostylis bracteata</i>, an Endemic Legume from Western Ghats

et al. 2014

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“…The total lack of multivalent formation in the meiocytes and occurrence of variable number of associations possibly suggest allopolyploid lineage of the species. Lackey (1979) suggested x 10 in M. uniflorum. The cytological approach involving the observation of meiotic cells is conventional and has been used to ascertain the basic chromosome number and secondary polyploidy nature of different plant species (Sengupta and Datta 2003, Mukherjee and Datta 2005, Iqbal and Datta 2007, Bhattacharya and Datta 2010, Mandal and Datta 2011.…”

Section: Mitotic Analysismentioning

confidence: 99%

“…Verdc. (Synonym: Dolichos biflorus L.; common name: horse gram; Family: Leguminosae; Sub-family: Faboideae; annual herb, potential uses nutraceuticals, forage and food for humans Morris 2008) has been reported variably (2n 20 Pritchard and Gould 1964, Maréchal and Otoul 1965, 19662n 20, 22, 24 Lackey 1979, 1980, Cook et al 2005; however, chromosome number alone does not provide any cytogenetical criteria which aiding to efficient breeding. The present communication reports on the karyotype analysis and meiotic chromosome behavior of M. uniflorum, which were previously undescribed, with the objective to collect cytogenetical information as a major step to enable improvement of the plant.…”

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<i>Macrotyloma uniflorum</i> (Lam.) Verdc. (Leguminosae)—A Note on Chromosomal Studies

et al. 2012

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Summary Karyotype analysis of Macrotyloma uniflorum (Lam.) Verdc. (Family: Leguminosae; Sub-family: Faboideae; annual herb, potential uses nutraceuticals, forage and food for humans) revealed 5 (2n 20; 4A m 2B sc sm 2C sm 2D sm 10E m ) morphologically distinct chromosome types. The karyotype showed a prevalence of chromosomes with median primary constrictions. Satellites were associated with the short arm of 2B-type chromosomes. Chromosome length in the complement varies from 1.26 to 2.41 µm. The karyotype was symmetric in nature (TF% 43.11). The meiocytes had 2n 20 chromosomes always with an average of 9.96II 0.08I per cell at diakinesis and metaphase I. Formation of 10 II was predominant (95.83%). All anaphase I cells were cytogenetically balanced (10/10). About 66.67% diakinesis and MI cells showed secondary association of chromosomes and the chromosomes assorted themselves into variable groups of 4 (4.69%), 5 (6.25%), 6 (23.44%), 7 (64.06%) and 8 (1.56%). Out of 24 different types of associations among the group classes, 2II(3) 1II(4) 46.88% (7 group class) was the most frequent. Secondary polyploidy has been attributed as the possible cause of secondary association of chromosomes and the basic chromosome number for the species is suggested to be x 7. Pritchard and Gould 1964, Maréchal and Otoul 1965, 1966 2n 20, 22, 24 Lackey 1979, 1980, Cook et al. 2005; however, chromosome number alone does not provide any cytogenetical criteria which aiding to efficient breeding. The present communication reports on the karyotype analysis and meiotic chromosome behavior of M. uniflorum, which were previously undescribed, with the objective to collect cytogenetical information as a major step to enable improvement of the plant. Materials and methods Plant materialSeed samples of Macrotyloma uniflorum (Lam.) Verdc. were collected from the Medicinal Plant Garden, Narendrapur, Ramkrishna Mission, Govt. of West Bengal, India (accession number not provided) and plants were raised in the Experimental Garden, University of Kalyani. A voucher specimen has been deposited in the Herbarium,

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Chromosome Numbers in the Phaseoleae (Fabaceae: Faboideae) and their Relation to Taxonomy

Cited by 53 publications

References 0 publications

Dynamic Rearrangements Determine Genome Organization and Useful Traits in Soybean

Dynamic Rearrangements Determine Genome Organization and Useful Traits in Soybean

Mitotic Chromosome Studies in <i>Nesphostylis bracteata</i>, an Endemic Legume from Western Ghats

<i>Macrotyloma uniflorum</i> (Lam.) Verdc. (Leguminosae)—A Note on Chromosomal Studies

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