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High annealing temperature rapid amplified polymorphic DNA (HAT-RAPD) wasused as the screening method for identification of 23 Thai Hedychuim species. From 16 arbitraryprimers, a total of 2,112 distinct polymorphic band patterns were generated. To understandthe relationship among Hedychium samples and three other genera of Zingiberaceae, aphylogenetic tree was generated from highly polymorphic data obtained from PCRamplification of DNA samples using character state data. The important character for eachclade was discussed. The unique band (519 bp) that only present in H. flavescens, a valuablespecies for horticulture importance and source of natural products, was obtained from theprimer OPAG-19 and selected for sequencing and conversion to the more reproducibleand robust sequence characterized amplified region (SCAR) marker specific to H. flavescens.These techniques for species identification and characterization provides a morphologicallyindependent test to verify relatedness and provide species information particularly for caseswhere such identification was previously impossible to obtain, for instance, in case ofmorphologically indistinguishable rhizome or vegetative parts in off-season or dormancy period.
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