title: Molecular criteria for determining new hybrid species--an application to the Sonneratia hybrids.
abstract: The possible hybrid origin of new species can usually be corroborated by molecular means. Here, we suggest that the segregation patterns of the molecular markers be further analyzed. A true hybrid species should show the patterns under continuous breeding among its members, at least beyond the F2 generation. We applied the guidelines to the putative hybrid species of Sonneratia, a widespread mangrove genus, and concluded that all the observed hybrids in this genus are simple F1's. Thus, S. x gulngai and S. x hainanensis are not true hybrid species. The segregation patterns of molecular markers should be heeded in interpreting the existence of hybrid species.
authors.affiliation: State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, Zhongshan University, Guangzhou 510275, People's Republic of China.
authors.forename: Renchao
authors.initials: R
authors.lastname: Zhou
authors.forename: Suhua
authors.initials: S
authors.lastname: Shi
authors.forename: Chung-I
authors.initials: CI
authors.lastname: Wu
mesh_terms: D001483:Base Sequence; D003433:Crosses, Genetic; D017931:DNA Primers; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics*; D006824:Hybridization, Genetic; D040582:Inheritance Patterns / Q000235:genetics; D029561:Lythraceae / Q000235:genetics*; D008969:Molecular Sequence Data; D021141:Nucleic Acid Amplification Techniques; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D017931:DNA Primers; D021903:DNA, Ribosomal Spacer; D005819:Genetic Markers