Light-dependent ethylene signal abnormality of the Arabidopsis auxin-related uro mutant

The Arabidopsis semi-dominant mutant upright rosette (uro) was named from its upright-growing leaves. Previous results suggest that uro mutant was caused by a single gene mutation and the URO function might be associated with auxin-mediated plant development. In this paper, some ethylene-related phenotypes of uro mutant are reported, such as hyponastic rosette leaves, persistent off perianth and elongated hypocotyls (Figs. 1,5). Results of ACC and ethylene inhibitor AgNO₃ treatment experiment suggest that some of the phenotypes of uro mutant are caused by ethylene signal system abnormality (Figs.2-6). uro mutant is an important material for studying the ethylene signal system especially for the relationship between auxin and ethylene.