Botanists conduct first large-scale genetic study of marijuana, hemp

A study by Canadian researchers is providing a clearer picture of the evolutionary history and genetic organization of cannabis, a step that could have agricultural, medical and legal implications for this valuable crop.

"Even though hemp and marijuana are important crops, knowledge about cannabis is lacking because of its status as a controlled drug," said Jonathan Page, a University of British Columbia botanist who co-led the first large-scale study of the genetic diversity of cannabis. The research was conducted together with Sean Myles, a population geneticist at Dalhousie University.

Researchers looked at the genotypes of 81 marijuana and 43 hemp samples. Using the DNA variants in the cannabis genome, they were able to search for relationships between different plants. They found that cannabis plants, which consist of three species (C. sativa, C. indica and C. ruderalis), are often incorrectly labeled.

Popular lore assigns different characteristics to marijuana plants. For example,...

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