Molecular Systematics of Some Cassia Species.

Ghareeb, A.; Khalifa, S.F.; Fawzi, Nael M.

doi:10.1508/cytologia.64.11

Cited by 13 publications

(5 citation statements)

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“…Foram estudados 74 acessos de 27 táxons incluídos em 10 gêneros (tabelas 1, 2). Destes, sete espécies tiveram seus números cromossômicos contados pela primeira vez, são elas: Turner 1960, Federov 1969, Gill & Husaini 1985, Godblatt 1988, Alves & Custódio 1989, Goldblatt & Johnson 1990, 1991, 1996 Irwin & Turner 1960, Federov 1969, Gill & 52, 56 Husaini 1985, Goldblatt 1988, Alves & Custódio 1989, Goldblatt & Johnson 1990, 1996 Burkart 1952, Turner 1956, Irwin & Turner 1960, 28, 56 Federov 1969, Coleman & De Menezes 1980, Gill & Husaini 1985, Goldblatt 1985, 1988, Ohri et al 1986, Jahan et al 1994, Goldblatt & Johnson 1990, 1991, 1994, 1996, Ghareeb et al 1999 Federov 1969, Bandel 1974, Gill & Husaini 1985, Goldblatt 1988, Kumari & Bir 1989, Jahan et al 1994, Goldblatt & Johnson 1991, 1994 Gill & Husaini 1985, Goldb...…”

Section: Resultsunclassified

Números cromossômicos e implicações sistemáticas em espécies da subfamília Caesalpinioideae (Leguminosae) ocorrentes na região sul do Brasil

2005

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-(Chromosome numbers and systematic implications in species of subfamily Caesalpinioideae (Leguminosae) from the Southern region of Brazil). The subfamily Ceasalpinioideae (Leguminosae) comprises around 2,800 species, many of which occurring in Brazil. For the Southern region of Brazil, 56 species economically, socially and scientifically important, are cited, distributed along different environments, but detailed taxonomic and cytogenetic studies are still missing. This paper reports chromosome number analysis in 74 accessions of 27 taxa belonging to ten genera of tribes Cassieae, Caesalpinieae, and Cercideae. The determined chromosome numbers were 2n = 32, 28, 26, 24, 22, 16 and 14. For seven species the chromosome numbers were determined for the first time: Cassia leptophylla, Senna araucarietorum, S. hilariana, S. neglecta, S. oblongifolia, Chamaecrista repens and Pomaria stipularis. Most species had 2n = 28 chromosomes, 2n = 26, 24, and 22 being also found. The genus Chamaecrista differs from the others studied as all its taxa presented 2n = 32, 16, and 14, the first one derived by polyploidy. The basic number of x = 14 was proposed for the species of nine of the studied genera, while x = 13, 12 and 11 would have probably been originated by disploidy. For the genus Chamaecrista, x = 8 is suggested for most species and x = 7 for the species of section Xerocalyx. Polyploidy seems to have played an important role in the initial diversification of the group, accompanied by several disploid reductions during the evolutionary process. The number of chromosomes distinguishes Chamaecrista from the other genera. This, together with other analyzed characteristics, as well as literature data, supports the separation of this genus from the other Cassieae genera.

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Section: Resultsunclassified

Números cromossômicos e implicações sistemáticas em espécies da subfamília Caesalpinioideae (Leguminosae) ocorrentes na região sul do Brasil

2005

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“…(Lewis et al 2005). This classification has been supported by taxonomical studies of these three genera based on different information, such as seed proteins (Guareeb et al 1999), morphological, vegetative, and reproductive characters Barneby 1981, 1982;Gottsberger and Silberbauer-Gottsberger 1988;Owens and Lewis 1989;Dulberger et al 1994;Boonkerd et al 2005), ontogenetic characteristics (Tucker 1996), molecular systematics (Doyle et al 2000;Bruneau et al 2001), and cytogenetics (Goldblatt 1981;Schifino-Wittmann 2005a, 2005b;Biondo, Miotto, Schifino-Wittmann et al 2005).…”

Section: Introductionmentioning

confidence: 91%

Chromosome number and meiosis in populations ofSennaspecies (Caesalpinioideae – Fabaceae) from Southeast Brazil

Resende¹,

Davide²,

Torres

2013

Caryologia

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Senna Mill. is one of the most representative genera of Caesalpinioideae, with wide geographical distribution. Some species have been cytogenetically characterized, but there is no information on population level. Therefore, the present work had the objective of characterizing and comparing chromosomal number and meiotic behavior of 39 accessions belonging to 11 species of Senna Mill. from southern Minas Gerais state, Brazil. Meiotic preparations were obtained by cell suspension technique and stained with 10% Giemsa solution. All meiotic phases were analyzed and the meiotic index was obtained. The species showed different chromosome numbers (n = 12, 13, 14, and 28). Meiotic behavior of four species is described for the first time. The chromosomal numbers reported for most species coincide with those described for populations from either Southern Brazil or from state of Pará. Intraspecific variation for chromosome number was observed in S. rugosa (G. Don) H. S. Irwin & Barneby (n = 14 and n = 28). This variation along with multivalent occurrence suggests polyploidization as an important event in the evolution of this species, as described for many others, mainly in Caesalpinioideae. Most of the analyzed species showed regular meiotic behavior, despite the occurrence of some irregularities.

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“…), which is presently divided in three genus: Senna, Chamaecrista Moench and Cassia (s.s.). This separation is supported by several studies based on morphological, vegetative and reproductive characters (Irwin and Barneby 1981;1982;Gottsberger and SilberbauerGottsberger 1988;Owens and Lewis 1989;Dulberger et al 1994), ontogenetic characteristics (Tucker 1996), seed proteins (Guareeb et al 1999), DNA fragments (Mondal et al 2000), molecular systematics (Doyle et al 1997;Bruneau et al 2001) and cytogenetics (Goldblatt 1981;Biondo 2004). In spite of that, works classifying Senna species as Cassia (s.l.)…”

Section: Introductionmentioning

confidence: 89%

Cytogenetics and Cytotaxonomy of Brazilian Species of Senna Mill. (Cassieae - Caesalpinioideae - Leguminosae)

et al. 2005

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-Chromosome numbers, meiotic behaviour, meiotic indexes and pollen fertility are reported for 17 Senna Mill. species occurring in Southern Brazil. Haploid numbers were n=11, 12, 13, 14 and 28. No intraspecific variability was detected; n=14 predominated. The only accession of S. rugosa showed to be tetraploid, in contrast to the a previous reference for this species. Meiotic behaviour was generally regular for all species and accessions, but some irregularities such as uni and multivalents and unequal segregation were occasionally observed. Meiotic indexes were high, over 95%. Mean pollen fertility was over 81% for all species, but in some taxa much lower values were found in some accessions. All species had prolate-spheroidal pollen grains. No relation between grain size, taxonomic position and chromosome number could be established. Our results, together with literature data, suggest that x=14 is the basic number for the genus, probably a secondary number derived from the x=7 suggested for all Caesalpinioideae, and that the other numbers in the genus represent a disploid series. A broader cytogenetic survey of a more representative number of species, along the geographic distribution of the genus, should be done addressing questions such as the extent of intra and inter-specific variability in chromosome number, occurrence of polyploidy and the real role of disploidy in Senna evolution

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Molecular Systematics of Some Cassia Species.

Cited by 13 publications

References 10 publications

Números cromossômicos e implicações sistemáticas em espécies da subfamília Caesalpinioideae (Leguminosae) ocorrentes na região sul do Brasil

Números cromossômicos e implicações sistemáticas em espécies da subfamília Caesalpinioideae (Leguminosae) ocorrentes na região sul do Brasil

Chromosome number and meiosis in populations ofSennaspecies (Caesalpinioideae – Fabaceae) from Southeast Brazil

Cytogenetics and Cytotaxonomy of Brazilian Species of Senna Mill. (Cassieae - Caesalpinioideae - Leguminosae)

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