Cannabis was first domesticated around 12,000 years ago in China, researchers found, after analyzing the genomes of plants from across the world.
The study, published in the Journal Science Advances on Friday, said the genomic history of Cannabis domestication had been under-studied compared to other crop species, largely due to legal restrictions. The researchers compiled 110 whole genomes covering the full spectrum of wild-growing feral plants, landraces, historical cultivars and modern hybrids of plants used for hemp and drug purposes.
The study said it identified “the time and origin of domestication, post-domestication divergence patterns and present-day genetic diversity”.
“We show that cannabis sativa was first domesticated in early Neolithic times in East Asia and that all current hemp and drug cultivators diverged from an ancestral gene pool currently represented by feral plants and landraces in China”, it said.
The evolution of the cannabis genome suggests that the plant was cultivated for multipurpose use over several millennia.
The currently highly- specialized hemp and drug varieties are thought to come from selective cultures initiated about 4,000 years ago, optimized for the production of fibers and cannabinoids
The selection led to unbranched, tall hemp plants with more fiber in the main stem, and well-branched, short Marijuana plants with more flowers, maximizing resin production.
The study was led by Luca Fumagalli of the University of Lausanne and involved scientists from Britain, China, India, Pakistan, Qatar and Switzerland.
“Our genomic dating suggests that early domesticated ancestors of hemp and drug types diverged from Basal cannabis around 12,000 years ago, indicating that the species had already been domesticated by early Neolithic times”, the study said.
“East-Asia has been shown to be an important ancient hot spot of domestication for several crop species…our results thus add another line of evidence”, it further added.
The researchers said their study offered an “unprecedented” base of genomic resources for ongoing molecular breeding and functional research, both in medicine and agriculture.