Cytological Study of &lt;i&gt;Droscra obovata&lt;/i&gt; MERT et KOCH. with Special Reference to its Hybridity

Shimamura, Tamaki

doi:10.15281/jplantres1887.55.553

Cited by 4 publications

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“…Meiotic observations by some researchers have been given the evidence of amphidiploidal origin of D. anglica with two genomes of D. rotundifolia or its related ancestral species, since MI confirmation of D. anglica and D. obovata Mert. et Koch (D. rotundifolia D. anglica Lasch) showed 20 II and 10 II +10 I , respectively (Rosenberg 1909, Shimamura 1941, Wood 1955, Kondo and Segawa 1988. The remained genomes seem to be D. linearis Goldie, due to the observation of meiotic behavior of the hybrid between D. anglica D. linearis, shown 10 II +10 I (Wood 1955).…”

Section: Polyploid Speciation and Formation Of Monomodal Karyotype In...mentioning

confidence: 99%

Colchicine Induction of Tetraploid and Octaploid Drosera Strains from D. rotundifolia and D. anglica

2021

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Artificial tetraploid and octaploid strains were induced from the wild species of Drosera rotundifolia (2n=2x=20) and D. anglica (2n=4x=40), respectively. The optimal condition of colchicine-treatments for polyploid inductions was determined first. A flow cytometry (FCM) analysis showed that the highest mixoploid score of D. rotundifolia was 20% in the treatment of 0.3% for 2 days (d), or 0.5% for 3 d, while the highest mixoploid score of D. anglica was 20% in the treatment of 0.5% for 2 d. Next, to remove chimeric cells, adventitious bud inductions were carried out using the FCM-selected individuals in both species. One strain from a total of 360 colchicine-treated leaf explants in each species had pure chromosome-double numbers of 2n=40 (tetraploid) in D. rotundifolia and 2n=80 (octaploid) in D. anglica. In both species, the guard cell sizes of the chromosomedoubled strains were larger than those of the wild types. The leaves of the chromosome-doubled strains of D. rotundifolia were larger than those of the wild diploid D. rotundifolia, while the leaves of the chromosome-doubled strains of D. anglica were smaller than those of the wild tetraploid D. anglica.

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Section: Polyploid Speciation and Formation Of Monomodal Karyotype In...mentioning

confidence: 99%

Colchicine Induction of Tetraploid and Octaploid Drosera Strains from D. rotundifolia and D. anglica

2021

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“…I a 3), sauf Drosera anglica ayant 2n = 40 (Fig. 4) (Rosenberg, 1909 ;Shimamura, 1941 ;Kondo & Segawa, 1988) se sont penches sur cette question et indiquent avoir observe Ia configuration "10 univalents -I 0 bivalents" a Ia metaphase I. II en sera question dans Ia discussion. …”

Section: Referenceunclassified

“…'on interprete en univalents ( ou non) des groupes de chromosomes juxtaposes sans etre apparemment lies, c'esta-dire en pseudo-association (voir en particulier Ia figure 15). Ces modes d'appariement different de ce que Rosenberg (1909), Shimamura (1941) et Kondo et Segawa ( 1988) ont indique pour l'hybride anglica-rotundifolia. II en sera question dans Ia discussion.…”

Section: B Drosera Anglica X Drosera Linearisunclassified

“…'existence de l'hybride anglica-rotundifolia est signalee maintes fois dans Ia litterature botanique, sans compter nos resultats. Plusieurs travaux, dont le notre, en presentent une verification cytologique par l'examen des chromosomes mitotiques ou meiotiques sur du materiel de difthentes provenances : citons Rosenberg ( 1903Rosenberg ( , 1909 pour Ia Norvege, Ia Suede et le Danemark, Shimamura ( 1941) pour le Japon, Schaeftlein ( 1960) pour l'Autriche, Kruckeberg (1964) pour ! 'Oregon, Belaeva et Siplivinsky (1976) pour le lac Ba"ikal et Seeholzer (1993) pour Ia Suisse.…”

Section: Drosera Rotundifolia X Drosera Linearisunclassified

“…Seeholzer ( 1993) propose finalement, pour verifier ! 'hypothese de Wood ( 1955) (Rosenberg, 1904(Rosenberg, , 1909Shimamura, 1941 ;Kondo & Segawa, 1988) (Fig. 9) demeure exceptionnel, Ia plupart des metaphases etant d'interpretation difficile avec des trivalents, peut-etre des tetravalents, en plus des univalents et des bivalents (Fig.…”

Section: Drosera Rotundifolia X Drosera Linearisunclassified

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Etude cytotaxonomique des espèces et des hybrides naturels du genreDrosera (Droseraceae)au Québec

Gervais

Gauthier

1999

Acta Botanica Gallica

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anglica is an amphiploid resulting from the chromosome doubling of the sterile linearis x rotundifolia hybrid. The meiotic pairing configurations observed in a linearis x anglica (2n = 30) hybrid suggest however that the process must have taken place with a primitive D. linearis somewhat different from the present species. D. /inearis is a species with narrow ecological requirements whose northeastern American lineage with some isolated western populations alone subsist and need protection.

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A cytotaxonomic study of some Australian species of Drosera L. (Droseraceae)

Kondo

Lavarack

1984

Botanical Journal of the Linnean Society

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KONDO, K. & LAVARACK, P. S., 1984. A cytotaxonomic study of some Australian species of Drosera L. (Droseraceae). Karyomorphological comparisons of 15 species of Australian Drosera are presented along with 11 new chromosome counts. In Australia the genus forms an extensive aneuploid series. The species which have chromosome numbers from n=10 to n= 19 show large chromosomes, while those which have chromosome numbers more than 20 show small chromosomes. Drosera paleacca shows the lowest chromosome number in the genus, 2n= 10, with 10 large chromosomes, indicating a new basic number, x = 5. The non‐staining gap between the chromatids of each chromosome is rather wide and their centromeric region is not seen throughout prophase, prometaphase, and metaphase. The C‐banding and silver‐staining analyses in Drosera petiolaris chromosomes suggest that Drosera chromosomes could have diffuse centromeres and simplified C‐segments. Some taxonomic implications are considered, notably the possible removal of Drosera banksii from Drosera section Ergaleium to Drosera section Lasiocephala and the reduction to synonymy of Drosera section Prolifera.

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Cytological Study of <i>Droscra obovata</i> MERT et KOCH. with Special Reference to its Hybridity

Cited by 4 publications

References 0 publications

Colchicine Induction of Tetraploid and Octaploid <i>Drosera</i> Strains from <i>D. rotundifolia</i> and <i>D. anglica</i>

Colchicine Induction of Tetraploid and Octaploid <i>Drosera</i> Strains from <i>D. rotundifolia</i> and <i>D. anglica</i>

Etude cytotaxonomique des espèces et des hybrides naturels du genreDrosera (Droseraceae)au Québec

A cytotaxonomic study of some Australian species of Drosera L. (Droseraceae)

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