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PCR clamping by locked nucleic acid (LNA) oligonucleotides is an effective technique for selectively amplifying the community SSU rRNA genes of plant–associated bacteria. However, the original primer set often shows low amplification efficiency. In order to improve this efficiency, new primers were designed at positions to compete with LNA oligonucleotides. Three new sets displayed higher amplification efficiencies than the original; however, efficiency varied among the primer sets. Two new sets appeared to be available in consideration of bacterial profiles by next-generation sequencing. One new set, KU63f and KU1494r, may be applicable to the selective gene amplification of plant-associated bacteria.

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