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A doubled haploid (DH) is a genotype formed when haploid cells undergo chromosome doubling. Artificial production of doubled haploids is important in plant breeding. Haploid cells are produced from pollen or egg cells or from other cells of the gametophyte, then by induced or spontaneous chromosome doubling, a doubled haploid cell is produced, which can be grown into a doubled haploid plant. If the original plant was diploid, the haploid cells are monoploid, and the term doubled monoploid may be used for the doubled haploids. Haploid organisms derived from tetraploids or hexaploids are sometimes called dihaploids (and the doubled dihaploids are, respectively, tetraploid or hexaploid).

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  • Doubled haploidy (en)
  • Double haploïdie (fr)
  • Verdubbeld haploïde (nl)
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  • A doubled haploid (DH) is a genotype formed when haploid cells undergo chromosome doubling. Artificial production of doubled haploids is important in plant breeding. Haploid cells are produced from pollen or egg cells or from other cells of the gametophyte, then by induced or spontaneous chromosome doubling, a doubled haploid cell is produced, which can be grown into a doubled haploid plant. If the original plant was diploid, the haploid cells are monoploid, and the term doubled monoploid may be used for the doubled haploids. Haploid organisms derived from tetraploids or hexaploids are sometimes called dihaploids (and the doubled dihaploids are, respectively, tetraploid or hexaploid). (en)
  • La double haploïdie, aussi appelée haplodiploïdisation, dihaploïdie ou technique des haploïdes doublés, est une technique de sélection variétale consistant à prélever des cellules haploïdes issues de gamètes d'une plante pour provoquer le doublement de leur stock chromosomique afin d'obtenir une lignée stable en seulement deux générations alors que la fixation (souvent incomplète) des principaux caractères sélectionnés par voie traditionnelle nécessite 6 à 8 générations d'autofécondations amenant à plus de 10 ans le temps nécessaire à l’obtention d'une variété. (fr)
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  • A doubled haploid (DH) is a genotype formed when haploid cells undergo chromosome doubling. Artificial production of doubled haploids is important in plant breeding. Haploid cells are produced from pollen or egg cells or from other cells of the gametophyte, then by induced or spontaneous chromosome doubling, a doubled haploid cell is produced, which can be grown into a doubled haploid plant. If the original plant was diploid, the haploid cells are monoploid, and the term doubled monoploid may be used for the doubled haploids. Haploid organisms derived from tetraploids or hexaploids are sometimes called dihaploids (and the doubled dihaploids are, respectively, tetraploid or hexaploid). Conventional inbreeding procedures take six generations to achieve approximately complete homozygosity, whereas doubled haploidy achieves it in one generation. Dihaploid plants derived from tetraploid crop plants may be important for breeding programs that involve diploid wild relatives of the crops. (en)
  • La double haploïdie, aussi appelée haplodiploïdisation, dihaploïdie ou technique des haploïdes doublés, est une technique de sélection variétale consistant à prélever des cellules haploïdes issues de gamètes d'une plante pour provoquer le doublement de leur stock chromosomique afin d'obtenir une lignée stable en seulement deux générations alors que la fixation (souvent incomplète) des principaux caractères sélectionnés par voie traditionnelle nécessite 6 à 8 générations d'autofécondations amenant à plus de 10 ans le temps nécessaire à l’obtention d'une variété. Si on utilise des gamètes mâles (pollen), on parle d'. Si on utilise des gamètes femelles (ovules), on parle de gynogenèse. Une étape de culture in vitro est le plus souvent nécessaire pour régénérer une plante entière car le taux de mutation naturelle de l'haploïdie (stérile) vers la diploïdie (féconde) n'est que de 1 à 10 % selon les variétés. (fr)
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