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Objective  Due to the allergic nature of the pollen of  Cryptomeria japonica , the most important Japanese forestry conifer, a pollen-free cultivar is preferred. Mutant trees detected in nature have been used to produce a pollen-free cultivar. In order to reduce the time and cost needed for production and breeding, we aimed to develop simple diagnostic molecular markers for mutant alleles of the causative gene  MALE STERILITY 1  ( MS1 ) in  C. japonica  to rapidly identify pollen-free mutants.    Results  We developed PCR and LAMP markers to detect mutant alleles and to present experimental options depending on available laboratory equipment. LAMP markers were developed for field stations, where PCR machines are unavailable. The LAMP method only needs heat-blocks or a water bath to perform the isothermal amplification and assay results can be read by the naked eye. Because the causative mutations were deletions, we developed two kinds of PCR markers, amplified length polymorphism (ALP) and allele specific PCR (ASP) markers. These assays can be visualized using capillary or agarose gel electrophoresis.

Development of diagnostic PCR and LAMP markers for MALE STERILITY 1 (MS1) in Cryptomeria japonica D. Don