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We analyzed the nucleotide sequences of the non-coding region of chloroplast DNA: the intergenic spacer between trnL (UAA) 3'exon and trnF (GAA). Two kinds of sequence, "type-1" and "type-2," were detected in 33 populations of Cannabis sativa. The length of the "type-1" fragment was 354 bp. In contrast, the "type-2" fragment from 3 populations was 353 bp long, with only one base deletion compared to "type-1." The fragment length from Humulus lupulus was 353 bp with a 1-bp deletion, and ten 1-bp substitutions compared to the sequences from C. sativa "type-1." Furthermore, we could clearly identify differences between C. sativa and H. lupulus using single-strand conformation polymorphism of PCR products (PCR-SSCP) analysis.

Intraspecific Variation in Cannabis sativa L. Based on Intergenic Spacer Region of Chloroplast DNA.