부산대학교 도서관

Plants develop juvenile phase to adult phase in vegetative stage. Although soybean is a very important crop worldwide, there has been only one study of the juvenile-adult phase change. In this study, we determined that the juvenile-adult phase change occurred at different stages in two soybean cultivars that differ in their photosensitivity. Cultivar 'Enrei' ( E1e2e3E4) is weakly photosensitive and cultivar 'Peking' ( E1E2E3E4) is strongly photosensitive. In 'Enrei', the leaf size gradually increased at a constant leaf position regardless of the difference in day length. In 'Peking' plants transferred to short-day conditions at several leaf development stages, leaf size gradually increased at different leaf positions. Expression of miR156 by 'Enrei' transferred to short-day conditions had nearly the same pattern as that of 'Enrei' grown under long-day conditions. In 'Peking', the expression of miR156 had different patterns in younger leaves of plants subjected to either a short-day treatment or long-day conditions. These results indicate that the E2 and E3 loci that regulate photosensitivity also regulate the expression of miR156 and the juvenile-adult phase change in soybean. [ABSTRACT FROM AUTHOR]