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《JOURNAL OF BEIJING FORESTRY UNIVERSITY》 2000-01
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Genetic diversity within a breeding system of Pinus tabulaeformis.

Li Yue; Zhang Chunxiao. Journal of Beijing Forestry University (2000)22(1)12～19 [Ch,26 ref.] College of Resources and Environment, Beijing For. Univ.,100083,P.R.China.  
Keeping higher genetic diversity within breeding population of forest tree is the premise for future selection and improvement. On the analysis of 9 isozymes, ACP, ADH, GOT, CAT, MDH, PGM, SKD, MNR and LAP, by horizontal starch gel electrophoresis, the changes of genetic diversity parameters among 6 populations, parental (NS) and progeny(NSP) of natural stands, parental (SO) and later progeny (SOP) of seed orchard and parental (TP) and progeny (TPP) of early testing populations, within a Chinese pine ( Pinus tabulaeformis Carr.) breeding system in Liaoning Province were detected. The results show that: ①There is higher genetic diversity within each population but less differentiation among them.②The genetic diversity of SO, which built by plus trees from 20 natural stands, is higher than NS. ③The diversity parameters of SOP are similar with NSP. ④The parameters of genetic diversity are increased from parental population(SO) to its first generation (TP) and second generation (TTP), and the parameters of all the three populations are higher than NS. It seems that the improving process could keep higher genetic diversity. ⑤The 3 parental populations (NS, TP and SO) are in Hardy Weinberg equilibrium, but 3 progeny populations (NSP, TPP and SOP) are not in accordance with Hardy Weinberg equilibrium. The strategies of conservation of genetic diversity within forest tree breeding system were discussed as well.
【Key Words】： Pinus tabulaeformis Carr. breeding system isozyme genetic diversity
【Fund】： 国家自然科学基金资助项目 !( 3 9470 5 96 )
【CateGory Index】： S791.254.04
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