Abstract
Short inflorescence stems and curled leaves are the characteristics of acaulis1 (acl1) mutants when grown at 22°C. High temperature is effective to restore the acl1 plant morphology. Even the severe acl1-1 plants, whose rosettes are about 1 cm in diameter and stems are slightly longer than the height of the rosettes, become almost undistinguishable from wild type at 28°C. Growing two acl1 alleles and acl2-1 plants at varied temperature revealed that the sufficient temperature for the restoration is different in each acl mutant. If the common pathway is involved in restoration of acl plant morphologies at high temperature, it is interesting that responses to a certain temperature differ among acl mutants. We found that the size of acl1 plants depends on the concentration of NH4NO3 in growth media. acl1-1 plants grown big by NH4NO3 supplementation still exhibit curled leaves and short inflorescence stems.
