Sonneratia ovata Backer - A genetically depauperate mangrove species

Zhou Renchao*; Suo Qiu

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Sonneratia ovata Backer - A genetically depauperate mangrove species

Zhou Renchao* 1 * #,Suo Qiu 2

1.State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, Sun Yat-Sen University, GuangZhou 510275

2.School of Life Sciences, Sun Yat-sen University

*Correspondence author

#Submitted by

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Funding: the Doctoral Foundation of Ministry of Education of China（No.200805581042）, National Natural Science Foundation of China （No.30730008, 30800060）, Natural Science Foundation of Guangdong（No.8451027501001492）

Opened online:26 March 2012

Accepted by: none

Citation: Zhou Renchao*,Suo Qiu.Sonneratia ovata Backer - A genetically depauperate mangrove species[OL]. [26 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4469332

It is expected that geographically widespread and outcrossing tree species would have high level of genetic variation. Three chloroplast regions and six nuclear genes were sequenced to assess the genetic variation of a species of mangroves, Sonneratia ovata, from China and Thailand. No nucleotide polymorphism was found in the three chloroplast regions and in the six nuclear genes from all of the four populations examined. The depauperation of polymorphism in S. ovata in comparison to moderate polymorphisms of other congeneric species is surprising, particularly considering high level of polymorphism in the past and relatively wide geographic distribution of the species. Since multiple independent loci were surveyed in this study, the most plausible explanation for our observation is that S. ovata has experienced severe demographic bottlenecks in the Pleistocene glaciation, followed by subsequent recolonization by sea currents in China and Southeast Asia regions. The lack of polymorphism may also be attributable to its small population size, despite its wide geographic distribution.

Keywords:mangroves; Sonneratia ovata; genetic variation; nuclear genes; chloroplast regions

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