Download Consulta: subjectFacets:"Tetraploid" Registros recuperados: 6 Data

Consulta: subjectFacets:"Tetraploid"
Registros recuperados: 6
Data/hora: 09/06/2017 09:53:38
A new variety of Bacopa monnieri obtained by in vitro polyploidization
Provedor de dados: 69
Autores: Salvio Escandón,Alejandro; Hagiwara,Juan Carlos; Alderete,Liliana Marisol.
The commercial value of Bacopa monnieri, a widespread herbaceous plant in Argentina, can be substantially improved increasing
its flower size by chromosome doubling with colchicine. MS supplemented with 0.25 mg/L of 6-benzylaminopurine proved to be
an appropriate medium for the in vitro multiplication of nodal segments of B. monnieri. Polyploidization was achieved
submerging nodal segments during 24 or 48 hrs in colchicine solution 0.001 and 0.01% P/V, in 1% DMSO. Segments submerged
in water and in DMSO 1% aqueous solution were used as controls. DNA contents from recovered plants was measured and
characterized and their phenotype described. Two tetraploid plants originated from independent events were detected. These
plants showed significant differences...
Tipo: Journal article
Palavras-chave: Colchicine; Flow cytometry; Ornamental plants; Scrophulariaceae; Tetraploid.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300002
Changes in motility, ATP content, morphology and fertilisation capacity during the movement phase
of tetraploid Pacific oyster (Crassostrea gigas) sperm
Provedor de dados: 5
Autores: Suquet, Marc; Labbe, C.; Brizard, Raphael; Donval, Anne; Le Coz, Jean-rene; Quere, Claudie; Haffray, P.
Changes in sperm features during the movement phase are especially interesting to study in external fertilization species whose
sperm duration movement is long because this implies a significant adaptation of moving cells to the external medium. This study
describes the changes in tetraploid Pacific oyster sperm characteristics in relation to time post activation. Sperm individually
collected on three tetraploid males were activated in seawater. Their features were analysed over a 24 h period and compared to a
sperm pool collected on three diploid males as a reference. The percentage of motile spermatozoa, the intracellular ATP content,
and the fine structure of spermatozoa were studied in relation to time post activation. Furthermore, the fertilisation...
Tipo: Text
Palavras-chave: Crassostrea gigas; Sperm; Tetraploid; Motility; ATP; Ultrastructure.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00006/11756/8639.pdf
Chromosome loss in bi-parental progenies of tetraploid Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Mccombie, Helen; Lapegue, Sylvie; Cornette, Florence; Ledu, Christophe; Boudry, Pierre.
Alterations of chromosome number have been observed in the somatic tissue of Crassostrea gigas diploids and artificial
polyploids. Tetraploid oysters with abnormal chromosome numbers in some or all of their tissue are considered undesirable as
parents either for triploids (produced via a cross with diploids and of aquacultural interest) or for tetraploid breeding. Aneuploid
tetraploid oysters may confer the tendency to lose chromosomes and to revert to lower ploidy levels to their offspring. More
directly, their offspring could have a lower ploidy because of potential links between somatic and gametic chromosome loss. The
present study evaluated the phenomenon in six bi-parental tetraploid families bred from parents of differing somatic ploidy
quality. The...
Tipo: Text
Palavras-chave: Crassostrea gigas; Mitosis; Chromosome; Cytogenetics; Aneuploid; Polyptoid; Tetraploid; Oyster.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-633.pdf
Chromosome loss in tetraploid families of the Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Mccombie, Helen; Lapegue, Sylvie; Cornette, Florence; Ledu, Christophe; Boudry, Pierre.
Alterations of chromosome number have been observed in the somatic tissue of Crassostrea gigas diploids and artificial
polyploids bred in this species.
Tetraploid animals with lower chromosome counts in some or all of their somatic tissue are
considered undesirable as parents either for commercial triploids (produced via a cross with diploids) or for tetraploid breeding
because (1) they may confer the tendency to lose chromosomes and revert to lower ploidy levels to their offspring or (2) their
offspring could have a lower ploidy directly because of potential links between somatic and gametic chromosome loss. The
present study evaluated the phenomenon in bi-parental tetraploid families bred from parents of differing ploidy quality, including
a...
Tipo: Text
Palavras-chave: Tetraploid; Chromosome; Genetic; Crassostrea gigas; Oyster.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-3435.pdf
New varieties of Magnolia biondii and Magnolia cylindrica (Magnoliaceae) in China
Provedor de dados: 16
Autores: Wang, Y.L.; Ejder, E.; Yang, J.F.; Kang, Y.X.; Ye, W.; Zhang, S.Z.
Magnolia biondii var. purpurascens var. nov. and Magnolia cylindrica var. purpurascens var. nov. (Magnoliaceae) are described as
two new varieties endemic to China. Magnolia biondii var. purpurascens is mainly restricted to forests of Shaanxi and SE Gansu
provinces. It differs from the typical variety, M. biondii var. biondii, in the dense indumentum of white hairs on twigs and the
cup-shaped purplish red flowers. Magnolia cylindrica var. purpurascens occurs in secondary forests of Jingning and Songyang
counties of southern Zhejiang province. It differs from the typical variety, M. cylindrica var. cylindrica, in the cup-shaped flowers
of purplish red colour. The two new varieties are distinct in their distributions in both cases but share the chromosome...
Tipo: Article / Letter to the editor
Palavras-chave: China; Magnolia; Magnolia biondii; Magnolia cylindrica; Magnoliaceae; Tetraploid; Variety.
Ano: 2013
URL: http://www.repository.naturalis.nl/record/525455
Wild ornamental germplasm exploration and domestication based on biotechnological approaches: In
vitro colchicine treatment to obtain a new cultivar of Scoparia montevidiensis
Provedor de dados: 69
Autores: Escandón,Alejandro S; Miyajima,Ikuo; Alderete,Marisol; Hagiwara,Juan Carlos; Facciuto,Gabriela; Mata,Diego;
Soto,Silvina M.
The genus Scoparia is native from Argentina. The diversity of colours and shape of their flowers bestows this genus a very
interesting ornamental potential. The purpose of the present study is to explore the Scoparia species germplasm by means of in
vitro polyploidization in order to improve their ornamental qualities. Accessions of S. montevidiensis var. montevidiensis, S.
montevidiensis var. glandulifera, S. nudicaulis, S. hasleriana and S. dulcis were collected and maintained under greenhouse
conditions. The Murashige-Skoog medium, supplemented with 0.25 mg/L BAP was used for the nodal segments multiplication of
the five Scoparia species. Except for S. hasleriana, the multiplication rate of the other species ranged between 10 and 12 shoots
per explant....
Tipo: Journal article
Palavras-chave: Chimera; Flow cytometry; Micropropagation; Ornamental plants; Tetraploid.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200010