A note on the cytology ofFimbristylis umbellaris (Lamk.) Vahl

Rath, S. P.; Patnaik, S. N.

doi:10.1007/bf02489471

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…fusca, F. insignis, F. littoralis, F. ovata, F. thomsonii and F. umbellaris), 20 (F. argentea) and 26 (F. dichotoma). The chromosome counts of F. argentea, F. littoralis and F. ovata conform to Bir et al (1992), Nijalingappa (1975a), Sanyal & Sharma (1972) and Nijalingappa (1975b) respectively, while the chromosome numbers of F. umbellaris differ from Rath & Patnaik, (1977) who reported that the chromosome count is 2n=6. In addition, the chromosome number of F. dichotoma (2n=26) in the present work differs from those previously published (2n=20 (Sanyal & Sharma, 1972), 2n=10 (Sharma & Bal, 1956), 2n=12 (Hsu, 1972), 2n=32 (Subramanian, 1988) and 2n=28 (Saensouk & Saensouk, 2018).…”

Section: Section Trichestylis F Thomsonii Boeckelersupporting

confidence: 80%

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Chromosome counts and karyotype reports from Fimbristylis (Cyperaceae) in Thailand

Zumstein¹,

Wangwasit²

2019

Thai Forest Bull., Bot.

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Fimbristylis Vahl is a large genus of Cyperaceae belonging to tribe Abildgaardieae. The genus comprises about 382 species worldwide (Govaerts et al., 2019) and is distributed mainly in the tropical and subtropics, with the greatest number in Southeast Asia and Northeastern Australia. It consists of annual and perennial plants. There are 63 species of Fimbristylis in Thailand, of which three are recently reported

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Section: Section Trichestylis F Thomsonii Boeckelersupporting

confidence: 80%

“…The somatic chromosome number for the species is 2n=10, which contrasts with Rath and Patnaik, (1977), who suggested that chromosome number of F. umbellaris is 2n= 6. F. umbellaris has eight median (m) and two submedian (sm) chromosomes.…”

Section: F Umbellaris (Lam) Vahlmentioning

confidence: 69%

Chromosome counts and karyotype reports from Fimbristylis (Cyperaceae) in Thailand

Zumstein¹,

Wangwasit²

2019

Thai Forest Bull., Bot.

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“…(n = 31;Hoshino, 1987). But, the reduction below the probable basic chromosome number (x = 5) also happens in Cyperaceae via dysploidy, such as n = 2 in Rhynchospora (Vanzela et al, 1996) and n = 3 in both Eleocharis (Da Silva et al, 2005) and Fimbristylis Vahl (Rath and Patnaik, 1977). Lower numbers have also been reported in other holocentric families, such as Juncaceae (Malheiros et al, 1947), Droseraceae (Kondo et al, 1994) and Convolvulaceae (Pazy and Plitmann, 1987;Pazy and Plitmann, 1994).…”

Section: Introductionmentioning

confidence: 97%

Holocentric Karyotype Evolution in Rhynchospora Is Marked by Intense Numerical, Structural, and Genome Size Changes

et al. 2020

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Cyperaceae is a family of Monocotyledons comprised of species with holocentric chromosomes that are associated with intense dysploidy and polyploidy events. Within this family the genus Rhynchospora has recently become the focus of several studies that characterize the organization of the holocentric karyotype and genome structures. To broaden our understanding of genome evolution in this genus, representatives of Rhynchospora were studied to contrast chromosome features, C-CMA/DAPI band distribution and genome sizes. Here, we carried out a comparative analysis for 35 taxa of Rhynchospora, and generated new genome size estimates for 20 taxa. The DNA 2Cvalues varied up to 22-fold, from 2C = 0.51 pg to 11.32 pg, and chromosome numbers ranged from 2n = 4 to 61. At least 37% of our sampling exhibited 2n different from the basic number x = 5, and chromosome rearrangements were also observed. A large variation in C-CMA/DAPI band accumulation and distribution was observed as well. We show that genome variation in Rhynchospora is much larger than previously reported. Phylogenetic analysis showed that most taxa were grouped in clades corresponding to previously described taxonomic sections. Basic chromosome numbers are the same within every section, however, changes appeared in all the clades. Ancestral chromosome number reconstruction revealed n = 5 as the most likely ancestral complements, but n = 10 appears as a new possibility. Chromosome evolution models point to polyploidy as the major driver of chromosome evolution in Rhynchospora, followed by dysploidy. A negative correlation between chromosome size and diploid number open the discussion for holokinetic drive-based genome evolution. This study explores relationships between karyotype differentiation and genome size variation in Rhynchospora, and contrasts it against the phylogeny of this holocentric group.

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A Synopsis of Chromosome Number Variation in the Cyperaceae

Roalson

2008

Bot. Rev

112

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The Cyperaceae are well known for having a large amount of variation in chromosome numbers both within and among genera. Most of this variation has been previously attributed to agmatoploid or qualitative aneuploid chromosome number change. To date there have been 4,231 reported chromosome number counts in the family. Despite the large number of counts made, they only represent approximately 16% of the species currently recognized. These counts are here presented in an indexed list with standardized nomenclature following a draft copy of the World Checklist of Cyperaceae. Additionally, I explore variation within genera where a significant number of counts have been made. Given the distributions of counts within genera there is evidence for both agmatoploid and polyploid chromosome number changes.

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A note on the cytology ofFimbristylis umbellaris (Lamk.) Vahl

Cited by 4 publications

References 6 publications

Chromosome counts and karyotype reports from Fimbristylis (Cyperaceae) in Thailand

Chromosome counts and karyotype reports from Fimbristylis (Cyperaceae) in Thailand

Holocentric Karyotype Evolution in Rhynchospora Is Marked by Intense Numerical, Structural, and Genome Size Changes

A Synopsis of Chromosome Number Variation in the Cyperaceae

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