In a screening for stay-green mutants in Arabidopsis, a developmentally retarded mutant, drm1, was obtained from ethyl methanesulfonate (EMS) -mutagenized M2 seeds in Columbia (Col-0) genetic background.

• 从EMS诱变的拟南芥(Col-0)M2群体中,分离筛选到了一个生长发育异常迟缓的突变体(drm1)。