DNA tests reveal similarities to early wet-rice farmers Some of the first wet-rice farmers in Japan might have migrated from the lower basin of China's Yangtze River more than 2,000 years ago, Japanese and Chinese researchers said Thursday. This was suggested by DNA tests conducted by the researchers that showed genetic similarities between human remains from the Yayoi Period found in southwestern Japan and the early Han Dynasty found in China's central Jiangsu Province, Satoshi Yamaguchi told reporters. People who introduced irrigation techniques to the Japanese archipelago in the Yayoi Period (250 B.C.-300) were believed to have come to Japan either from the Korean Peninsula across the Tsushima Strait, or from northern China across the Yellow Sea. The latest findings, however, bolster another theory suggesting the origin of the Yayoi people was an area south of the Yangtze, which is believed to be the birthplace of irrigated rice cultivation. Yamaguch...