TAILIEUCHUNG - báo cáo khoa học: "Timing and duration of hatching in gynogenetic, triploid, tetraploid, and hybrid progenies in rainbow trout Edwige QUILLET"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Timing and duration of hatching in gynogenetic, triploid, tetraploid, and hybrid progenies in rainbow trout Edwige QUILLET | Génét. Sél. Evol. 1988 20 2 199-210 Timing and duration of hatching in gynogenetic triploid tetrapioid and hybrid progenies in rainbow trout Edwige QUILLET B. CHEVASSUS and A. DEVAUX I Institut National de la Recherche Agronomique Laboratoừe de Génétique des Poissons 78350 Jouy-en-Josas France Summary Mean duration of embryonic development and variability of this parameter were studied for seven different progenies in rainbow trout diploid controls diploid gynogenetics triploids resulting from heat shock or from a direct cross between diploid female and tetrapioid male tetrapioids and diploid or triploid hybrids between female rainbow trout and male coho salmon. The main results were 1 gynogenesis does not change mean duration of embryonic development but induces larger variability of this parameter 2 the higher the ploidy level the shorter the duration of embryonic development tetrapioids hatch before the two types of triploids which hatch before the diploid controls. On the other hand within group variability of hatching time is generally greater in these groups than in the control 3 in the case of interspecific hybridization triploidy also reduces duration of embryonic development relatively to diploid hybrids but induces greater homogeneity in hatching times than in diploid hybrids. Key words salmonids polyploidy gynogenesis hybridization hatching. Resume Date et durée d eclosion de descendances gynogénétiques triploides tétraploỉdes et hybrides chez la truite arc-en-ciel La Vitesse moyenne de développement embryonnaire mesurée par la date d eclosion et sa variabilité ont été etudiées dans sept types de descendances chez la truite arc-en-ciel des temoins diploides des gynogénétiques diploides des triploides obtenus par retention du second globule polaire choc thermique chaud et des triploides obtenus par croisement direct entre une femelie diploide et un male tétraploỉde des tétraploídes et des hybrides diploides OU triploides entre la femelle truite .

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