Phylogenetic Relationship Between Five Ecotypes and Japanese Varieties in Rice

Abstract

Rice varieties belonging to five ecotypes, Aus, Aman, Boro, Bulu and Tjereh, and those of Japanese origin were examined for various characters, such as acid phosphatase zymogram, phenol reaction, grain shape, etc. Japanese rice and Bulu ecotype were characterized by an isozyme gene, Acp_l⁹, negative phenol reaction, the length/width ratio of the grain less than 2, slow water absorption in seeds, reduced elongation of mesocotyl after 4h water soaking, short mesocotyl length in a given water content at the time of high-temperature treatment and the small amount of oxygen absorption in a given soaking time. The results suggest that Japanese rice should have close relationship with the Bulu ecotype.