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Controlled pollinations were made between five hemlock ( Tsuga ) species from eastern North America and Asia, resulting in over 5700 germinating seedlings. A subset of putative hybrid seedlings from each cross was tested for authenticity by various DNA marker systems. The most reliable and useful system for verifying hybrids was amplified fragment-length polymorphism (AFLP) markers. Hybridizations between the eastern North American species,  T. canadensis  [L.] Carriere and  T. caroliniana  Engelm., and the Asian species,  T. chinensis  (Franch.) E. Pritz . , were used as a model to test the inheritance, reliability, and ease of use of these markers. Using AFLP markers, we were able to verify 58 hybrids between  T. caroliniana  and  T. chinensis , one hybrid between  T. caroliniana  and  T. canadensis , but could find no definitive hybrids between  T. canadensis  and  T. chinensis . Results using other marker systems, including RAPD, SCAR, ITS, and SSR, are also presented.

Molecular Markers Used to Verify Interspecific Hybridization between Hemlock (Tsuga) Species