2022 Volume 67 Pages 35-40
Thirty-one lines of Oryza sativa／Oryza glumaepatula introgression lines (GLU-ILs) were tested for their internodal elongation in responses to gradual submergence. Submergence promoted internodal elongation in 29 GLU-ILs. Among them, GLU-IL135 possessing SNORKEL2 (SK2) and SK2-like genes derived from the donor parent deepwater type accession O. glumaepatula IRGC105668 and GLU-IL110 possessing ACE1 derived from IRGC105668 exhibited the highest internodal elongation rate. However, GLU-IL104 and GLU-IL107 possess SEMIDWARF 1 (SD1) gene derived from IRGC105668 but displayed slight internodal elongation. These results suggest that the SK genes and the ACE1 gene may contribute mainly to internodal elongation under submergence in O. glumaepatula.
