ibclogo XVI International Botanical Congess


Abstract Number: 5646
Poster No. = 1922


POPULATION GENETIC STRUCTURE AND REPRODUCTIVE BIOLOGY OF AVICENNIA MARINA.


X. Ge, G. S. Maxwell*, and M. Sun, University of Hong Kong, *Open University of Hong Kong, Hong Kong


Allozyme, ISSR and RAPD markers were used to evaluate genetic structure of Avicennia marina from Hong Kong, South China, Thailand and New Zealand. Pollination experiments showed that the species is self-incompatible. Despite its outbreeding system, all estimates of genetic variation (allozyme P=32%, A=1.13, Ht=0.081, ISSR Ht=0.112 and RAPD Ht=0.086) were low in comparison with other animal-mediated outbreeders. However, very large gene differentiation was observed (Gst=0.63, 0.90 and 0.85 for allozyme, ISSR and RAPD, respectively), indicating lack of gene flow among populations. The high gene differentiation was mainly due to genetic divergence between the two varieties studied, var. marina and var. resinifera. Within each variety, genetic identity (0.985-0.999) was very high based on all three markers.


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