Mitsuru Sakitani suggests that Haplogroup O1b1, which is common in Austroasiatic people and some other ethnic groups in southern China, and haplogroup O1b2, which is common in today's Japanese and Koreans, are the carriers of early rice agriculture from southern China.
mˈɪtsɚɹˌuː sˌækɪtˈɑːni sədʒˈɛsts ðæt hˈæpləɡɹˌuːp ˈoʊ wˈʌn bˈiː wˈʌn, wˌɪtʃ ɪz kˈɑːmən ɪn ˌɔːstɹoʊsɪˈæɾɪk pˈiːpəl ænd sˌʌm ˈʌðɚɹ ˈɛθnɪk ɡɹˈuːps ɪn sˈʌðɚn tʃˈaɪnə, ænd hˈæpləɡɹˌuːp ˈoʊ wˈʌn bˈiː tˈuː, wˌɪtʃ ɪz kˈɑːmən ɪn tədˈeɪz dʒˌæpənˈiːz ænd kɚɹˈiːənz, ɑːɹ ðə kˈæɹɪɹz ʌv ˈɜːli ɹˈaɪs ˈæɡɹɪkˌʌltʃɚ fɹʌm sˈʌðɚn tʃˈaɪnə.