TAILIEUCHUNG - Báo cáo khoa học: "Cytogenetic study of diploid and spontaneous triploid oaks, Quercus robur L"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Cytogenetic study of diploid and spontaneous triploid oaks, Quercus robur L. | 144s Ann Sci For 1993 50 Suppl 1 144S-150S Elsevier INRA Original article Cytogenetic study of diploid and spontaneous triploid oaks Quercus robur L AK Butorina Department of Genetics and Bioecology Central Research Institute of Forest Genetics and Breeding Voronezh Russia Summary Data are presented on the cytogenetics of 2 unusually large oak trees found in the Voronezh region of Russia. In both trees cells with 2n 3x 36 chromosomes were predominant with occasional observations of diploid hypoaneuploid and hyperaneuploid cells. Functionally the trees can be considered triploids although in a strict sense they are mixopioids. Meiosis in microsporogenesis of these trees is very disturbed and as a consequence pollen with unbalanced chromosome numbers are produced. Correspondingly the progeny from each tree were very different in morphological characteristics and cytogenetic constitution. These progeny can be used in gene mapping studies and for other basic research purposes. Studies on some diploid oaks reveal the presence of 2n pollen formed by parallel spindles in the 2nd meiotic division. Methods for producing additional oak triploids that have a potential for heterosis are discussed. oak I triploid mixopioid meiosis meiotic mutant I progeny Resume Cytogénétique de chênes diploides et triploĩdes spontanés Quercus robur L . Des données cytogénétiques relatives à 2 chênes de très grande faille situés dans la region de Voronezh Russie sont presentees dans cet article. Des cellules comprenant 2n 3x 36 chromosomes sont prédominantes dans chaque arbre. Des cellules hypoaneuploides et hyperaneuploides ont également été rencontrées. Au plan fonctionnel les 2 arbres peuvent être considérés comme tri-ploides plus précisément mixoploĩdes. La méiose durant la microsporogenèse est très perturbée et produit des grains de pollen au nombre de chromosomes déséquilibré. Les descendants de ces arbres manifestent des caractéristiques morphologiques et une constitution cytogénétique .

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