India gave China new rice variety 2000 years ago: Research study

According to a multidisciplinary research study involving international scientists, a major change in climate some four millennia ago had led to the diversification of Japanese variety of rice into tropical and temperate varieties. Tropical japonica rice reached Southeast Asian islands around 2,500 years ago, while those of subspecies indica were grown in India and migrated into China around 2,000 years ago.