MATING SYSTEM OF BRUGUIERA GYMNORRHIZA POPULATIONS OF MANGROVE, CHINA
We investigated genotypic variation in 4 Bruguiera gymnorrhiza (mangrove) populations using horizontal sliceable gel electrophoresis for polymorphic loci of allozymes as a genetic marker. Mating system was also investigated with MLT. The four populations studied were located between 24°24′N and 19°51′N on the Chinese coast at (from N to S) Fugong (Fujian), Futian (Guangdong), Shankou(Guangxi) and Dongzhai Horbor (Hainan). The polymorphic loci selected for analysis differed among the four populations:Mdh-1, Mdh-2,Me-1 in Fugong, Guangxi and Hainan and Mdh-1,Mdh-2,Aat-1,Aat-2 in Shenzhen. A strong difference in outcrossing rates of polymorphic loci was found: Fugong, at 0.845, had the highest rate while Hainan, 0.267, was the smallest. The difference between outcrossing rates of polymorphic loci and the mean outcrossing rates of monomorphic loci in these four areas also varied, showing slight biparental inbreeding in the mating system of the Fugong, Guangxi and Hainan populations but random crossing in the Guangxi population. We conclude the Bruguiera gymnorrhiza is a mixed-mating species and the mating system is mainly outcrossing.This is influenced by factors such as plant population density and structure and the adaptability of pollinator as well the presence or absence of self-incompatibility mechanisms.
NETL
NSTL
万方数据
维普
