Karyotypes in cultivated and wild species of Linum.

Chennaveeraiah, M. S.; Joshi, Kunjani

doi:10.1508/cytologia.48.833

Cited by 26 publications

(12 citation statements)

References 11 publications

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“…This phylogenetic network is consistent with evolutionary pathways derived previously from morphological and cytological data (see Fig. 3 of Chennaveeraiah and Joshi 1983), at least to the level of taxonomic section. The Linum species assayed in this study, although not truly comprehensive, should be representative for the four taxonomic sections studied here.…”

Section: Resultssupporting

confidence: 91%

“…These divisions, based only on morphological characters, are useful, but may not reflect evolutionary relationships (Gill 1966). Based on chromosome numbers and karyomorphological similarities, Chennaveeraiah and Joshi (1983) described evolutionary relationships of 19 Linum species. Gill (1987) continued the effort by determining the chromosome counts of 41 Linum species, ranging from 2n = 16 to 80.…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic network of Linum species as revealed by non-coding chloroplast DNA sequences

Allaby

2009

Genet Resour Crop Evol

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Crop wild relatives are invaluable sources of novel genes for crop improvement and adaptation to changing environments. We assessed phylogenetic relationships among 29 Linum accessions representing 16 species, including cultivated flax and its progenitor pale flax, based on four non-coding regions of chloroplast DNA sequences. We obtained a cpDNA network showing that these 16 Linum species are appropriately connected based on previously defined taxonomic sections; these connections reflect the same evolutionary pathways as determined from earlier morphological and cytological data. These relationships also support an earlier hypothesis that cultivated flax is probably descended from a single domestication of pale flax plants, apparently for oil usage. The detailed species network not only is significant for understanding evolutionary relationships of Linum species, but also useful for classifying exotic gene pools of cultivated flax as a part of the ongoing exploration of new genetic diversity for flax improvement.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Phylogenetic network of Linum species as revealed by non-coding chloroplast DNA sequences

Allaby

2009

Genet Resour Crop Evol

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“…Based on comparison of chromosome morphology (routine staining), the phylogenetic tree was built and species with 2n = 18 were suggested to be the progenitor of the 18-, 16-and 30-chromosome species (Chennaveeraiah and Joshi 1983). Interspecific hybridization of L. usitatissimum 9 L. grandiflorum was more fruitful than L. usitatissimum 9 L. austriacum (Seetharam 1972).…”

Section: Evolution In Sects Linum and Adenolinummentioning

confidence: 99%

“…Linum and Adenolinum showed that species with 2n = 30, 2n = 18 and 2n = 16 were clustered in three separate groups (Lemesh et al 2001;Fu et al 2002). Due to the small size and similar morphology of Linum chromosomes (Ray 1944;Lewis 1964;Harris 1968;Chennaveeraiah and Joshi 1983), comparative chromosome analysis based on the use of different types of banding and molecular markers (physical chromosome mapping of ribosome genes by FISH) was not, until recently, applied. Meanwhile, such combined approach has been successfully applied to studies of different plant genomes.…”

Section: Introductionmentioning

confidence: 99%

Comparison of genomes of eight species of sections Linum and Adenolinum from the genus Linum based on chromosome banding, molecular markers and RAPD analysis

et al. 2008

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Karyotypes of species sects. Linum and Adenolinum have been studied using C/DAPI-banding, Ag-NOR staining, FISH with 5S and 26S rDNA and RAPD analysis. C/DAPI-banding patterns enabled identification of all homologous chromosome pairs in the studied karyotypes. The revealed high similarity between species L. grandiflorum (2n = 16) and L. decumbens by chromosome and molecular markers proved their close genome relationship and identified the chromosome number in L. decumbens as 2n = 16. The similarity found for C/DAPI-banding patterns between species with the same chromosome numbers corresponds with the results obtained by RAPD-analysis, showing clusterization of 16-, 18- and 30-chromosome species into three separate groups. 5S rDNA and 26S rDNA were co-localized in NOR-chromosome 1 in the genomes of all species investigated. In 30-chromosome species, there were three separate 5S rDNA sites in chromosomes 3, 8 and 13. In 16-chromosome species, a separate 5S rDNA site was also located in chromosome 3, whereas in 18-chromosome species it was found in the long arm of NOR-chromosome 1. Thus, the difference in localization of rDNA sites in species with 2n = 16, 2n = 30 and 2n = 18 confirms taxonomists opinion, who attributed these species to different sects. Linum and Adenolinum, respectively. The obtained results suggest that species with 2n = 16, 2n = 18 and 2n = 30 originated from a 16-chromosome ancestor.

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“…The morphological diversity of pale flax has been studied to some extent (Tammes 1928;Diederichsen and Hammer 1995), but screening of this taxon for disease resistance or seed-oil characters has not yet been conducted and could clarify whether it deserves more attention by plant breeders. Heer (1872) assumed that pale flax was cultivated by early Neolithic farmers in Table 4 Linum Botanical information according to: Davis (1967), Ockendon and Walters (1968), Yuzepchuk (1949) and Winkler (1931) b For full names of the institutions and information source see Gill andYermanos (1967a, 1967b), Gill (1987), Seetharam (1972), Chennaveeraiah and Joshi (1983) and Kutuzova (1998 Switzerland. Pale flax is homostylous similar to cultivated flax, while many other Linum species are heterostylous, indicative of cross-pollination.…”

Section: Other Linum Speciesmentioning

confidence: 99%

Ex situ collections of cultivated flax (Linum usitatissimum L.) and other species of the genus Linum L.

Diederichsen

2007

Genet Resour Crop Evol

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An overview of ex situ collections of cultivated flax (Linum usitatissimum L.) and 53 other species of the genus Linum L. is presented. The names of 33 genebanks in 23 countries preserving Linum germplasm and the species preserved at these places are provided. World genebanks engage in ex situ preservation of about 48,000 accessions of cultivated flax (Linum usitatissimum). However, possibly only 10,000 accessions of these are unique. Of the ca. 200 species of the genus Linum, other than L. usitatissimum, 53 are reported to be represented in the world's ex situ collections with a total of about 900 accessions. Of these, 279 accessions alone refer to the wild progenitor of cultivated flax, Linum bienne Mill. However, L. bienne from the region of origin of cultivated flax is rarely represented in genebank collections. References to publications describing the techniques for ex situ conservation and the infraspecific variation of cultivated flax are made. It is suggested that taxonomic species delimitation within the genus Linum is in need of clarification and that the variation in Linum species for ornamental use or use in breeding is investigated.

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Karyotypes in cultivated and wild species of Linum.

Cited by 26 publications

References 11 publications

Phylogenetic network of Linum species as revealed by non-coding chloroplast DNA sequences

Phylogenetic network of Linum species as revealed by non-coding chloroplast DNA sequences

Comparison of genomes of eight species of sections Linum and Adenolinum from the genus Linum based on chromosome banding, molecular markers and RAPD analysis

Ex situ collections of cultivated flax (Linum usitatissimum L.) and other species of the genus Linum L.

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