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| 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 |
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| 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 |
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| SCHMITZ,M.F.; CECHIN,J.; HENCKES,J.R.; PIASECKI,C.; AGOSTINETTO,D.; VARGAS,L.. |
| ABSTRACT: The intergenotypic competition of tetraploid ryegrass with natural diploid population may be a tool to reduce the frequency of resistant individuals in an area. This study aimed to identify and compare the phenological development, fitness cost, and competitive ability between diploid and tetraploid ryegrass genotypes. Genotypes were grown in pots, and the morphological variables of genotype growth were assessed every 15 days up to 120 days after emergence to evaluate the fitness cost. Phenological development and seed yield components were measured in a single time together with the fitness cost. Competitive ability was determined in a replacement-series experiment with proportions of tetraploid and diploid ryegrass, in which the number of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium multiflorum; Competition; Diploid; Tetraploid; Integrated weed management. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100189 |
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| 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 |
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| 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 |
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