TAILIEUCHUNG - Báo cáo khoa học: "The proportion of hybrids in seed seed orchard composed of two larch (L europaea and L leptolepis)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"The proportion of hybrids in seed seed orchard composed of two larch (L europaea and L leptolepis). | Ann Sci For 1991 48 631-640 Elsevier INRA 631 Original article The proportion of hybrids in seed from a seed orchard composed of two larch species L europaea and L leptolepis M Hacker F Bergmann Abteilung fur Forstgenetik und ForstpflanzenzOchtung Georg-August-Universităt D-3400 Gõttingen Germany Received 21 January 1991 accepted 17 June 1991 Summary The proportion of hybrids in the seed produced in an orchard containing one European larch Larix europaea clone used as maternal tree and 271 Japanese larch Larix leptolepis clones used as pollinators was determined by isoenzymatic methods. On the basis of the 2 enzyme systems Shikimate dehydrogenase SKDH and NADH dehydrogenase NDH the 2 larch species could be unequivocally distinguished in this case and therefore the proportion of hybrids and selfings Individual and clonal exactly determined. The genetic control of these enzyme systems was analyzed by means of offspring of controlled including reciprocal crossings between one European and one Japanese larch. Five samples of different crop years of the hybrid seeds were examined. The proportion of full seeds ranged from 22-60 and the proportion of hybrids in full seed from thus showing that this method of producing hybrids is very efficient. A further advantage of the use of 2 enzyme systems is the easier detection of minimum amounts of contamination which in this case ranged from . The possible Influence of the parental genotypes on the genetic structure of hybrids and possible explanations for the origin of the contamination are discussed. larch I hybrid seed orchard I contamination Résumé Taux d hybridation dans la descendance d un verger à graines composé de deux espèces de mélèze Lartx europaea et L leptolepis . Le faux d hybridation dans les lots de graines produits dans un verger contenant un clone de mélèze d Europe Larix europaea utilisé comme arbre mère et 271 clones de mélèzes du Japon utilisés comma pollinisateurs a été détermi-nố par vole

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