DRL1 Regulates Adaxial Leaf Patterning and Shoot Apical Meristem Activity in Arabidopsis

Leaf shape is controlled early on by initiation at the shoot apical meristem (SAM), as well as by changes in the rates and planes of cell division and the polarity-dependent differentiation of leaf cells. To elucidate the regulation of this differentiation by signal(s) from the SAM, we screened for mutations in genes that might be involved in these early processes. A novel recessive mutant, 356-2 [identified as a new allele of the deformed root and leaf1 (drl1) mutant], was isolated from a collection of Ds transposon insertion lines.