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May 15, 2020 · Originating around 9,000 yr ago in the Yangtze Valley, rice diversified into temperate and tropical japonica rice during a global cooling event about 4,200 yr ago. Soon after, tropical japonica...
The genetic evidence has established that the two subspecies have different mitochondrial genomes and therefore corroborates two distinct origins, with indica derived from an annual O. nivara- like ancestor and japonica from the perennial O. rufipogon.
May 29, 2017 · Archaeologists Find Evidence of the First Rice Ever Grown - The Atlantic. Science. Rice Was First Grown At Least 9,400 Years Ago. Archaeologists have unearthed bits of rice from when it was...
