Genetic diversity and multilocus associations in Cunninghamia lanceolata (Lamb.) Hook from The People's Republic of China

Open-pollinated seeds were assayed for allozyme polymorphisms at 24 loci to assess genetic diversity and multilocous associations in 16 populations of Cunninghamia lanceolata (Lamb.) Hook in the People's Republic of China. On average, the percentage of polymorphic loci was 88.0, the number of a...

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Bibliographic Details
Published in:Theoretical and applied genetics 1994-06, Vol.88 (3-4), p.465-471
Main Authors: Yeh, F.C, Shi, J, Yang, R, Hong, J, Ye, Z. (Alberta Univ., Edmonton (Canada). Dept. of Forest Science)
Format: Article
Language:English
Subjects:
alleles
ALLOZYME
allozymes
ALOZIMAS
Biological and medical sciences
CHINA
CHINE
Classical genetics, quantitative genetics, hybrids
CUNNINGHAMIA LANCEOLATA
DISTANCE GENETIQUE
DISTANCIA GENETICA
enzyme polymorphism
Fundamental and applied biological sciences. Psychology
gene frequency
genetic variation
Genetics of eukaryotes. Biological and molecular evolution
heterozygosity
LOCI
LOCUS
POLIMORFISMO
POLYMORPHISME
Pteridophyta, spermatophyta
Vegetals
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Summary:Open-pollinated seeds were assayed for allozyme polymorphisms at 24 loci to assess genetic diversity and multilocous associations in 16 populations of Cunninghamia lanceolata (Lamb.) Hook in the People's Republic of China. On average, the percentage of polymorphic loci was 88.0, the number of alleles per locus was 3.0, and the expected heterozygosity was 0.394. The distribution of genetic diversity was not correlated with the geographic and climatic variables of the populations. However, allele frequencies correlated linearly with the mean annual temperature of the populations at Mdh-1, Mdh-2, Mnr-2, Pgi-1, and Skdh-1 and with the altitude of the populations at Aph-4 and 6Pg-2. Of the total gene diversity 6% was attributed to amongpopulation differentiation; 94% resided within populations. Two-locus gametic disequilibria were found in 15 of the 16 populations, and higher-order gametic disquilibria were significant in most populations. The gametic disequilibria did not correlate with geographic and climatic variables. The results suggest that population subdivision, founder effect, occurrence across diverse environments, a mating system dominated by inbreeding, and historical events from 2000 years of cultivation are contributing factors in the generation and maintenance of the multilocus genetic structure in this conifer.
ISSN:0040-5752
1432-2242
DOI:10.1007/BF00223662