Bruguiera hainesii, a critically endangered mangrove species, is a hybrid between B. cylindrica and B. gymnorhiza (Rhizophoraceae)

Junya Ono, and Jean W. H. Yong, and Koji Takayama, and Mohd Nazre Bin Saleh, and Alison K. S. Wee, and Takeshi Asakawa, and Orlex Baylen Yllano, and Severino G. SalmoIII, and Monica Suleiman, and Nguyen Xuan Tung, and Khin Khin Soe, and Sankararamasubramanian Halasya Meenakshisundaram, and Yasuyuki Watano, and Edward L. Webb, and Tadashi Kajita, (2016) Bruguiera hainesii, a critically endangered mangrove species, is a hybrid between B. cylindrica and B. gymnorhiza (Rhizophoraceae). Conservation Genetics. pp. 1-8. ISSN 1566-0621


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Bruguiera hainesii (Rhizophoraceae) is one of the two Critically Endangered mangrove species listed in the IUCN Red List of Threatened Species. Although the species is vulnerable to extinction, its genetic diversity and the evolutionary relationships with other Bruguiera species are not well understood. Also, intermediate morphological characters imply that the species might be of hybrid origin. To clarify the genetic relationship between B. hainesii and other Bruguiera species, we conducted molecular analyses including all six Bruguiera species using DNA sequences of two nuclear genes (CesA and UNK) and three chloroplast regions (intergenic spacer regions of trnL-trnF, trnS-trnG and atpB-rbcL). For nuclear DNA markers, all nine B. hainesii samples from five populations were heterozygous at both loci, with one allele was shared with B. cylindrica, and the other with B. gymnorhiza. For chloroplast DNA markers, the two haplotypes found in B. hainesii were shared only by B. cylindrica. These results suggested that B. hainesii is a hybrid between B. cylindrica as the maternal parent and B. gymnorhiza as the paternal one. Furthermore, chloroplast DNA haplotypes found in B. hainesii suggest that hybridization has occurred independently in regions where the distribution ranges of the parental species meet. As the IUCN Red List of Threatened Species currently excludes hybrids (except for apomictic plant hybrids), the conservation status of B. hainesii should be reconsidered. © 2016 Springer Science+Business Media Dordrecht

Item Type: Article
Uncontrolled Keywords: Endangered species; Genetics; Hybridization; Mangrove
Subjects: S Agriculture > SB Plant culture
Divisions: SCHOOL > Institute for Tropical Biology and Conservation
Depositing User: Unnamed user with email
Date Deposited: 13 Jul 2016 01:10
Last Modified: 23 Oct 2017 04:43

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