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THE PLANT CELL, Vol 6, Issue 10 1343-1355, Copyright © 1994 by American Society of Plant Biologists
Glossy15 Controls the Epidermal Juvenile-to-Adult Phase Transition in Maize
S. P. Moose and P. H. Sisco
Departments of Genetics and Crop Science, North Carolina State University, Raleigh, North Carolina 27695-7620
Loss-of-function mutations at the maize Glossy15 (Gl15) locus alter the
normal transition from juvenile-to-adult growth by conditioning the
abbreviated expression of juvenile epidermal cell traits and the coordinate
precocious expression of adult epidermal cell features. These include
epicuticular wax composition, cell wall characteristics, and the presence
or absence of differentiated epidermal cell types (e.g., epidermal
macrohairs and bulliform cells). A transposon-induced mutable allele of
Glossy15 (gl15-m1) was isolated and employed in both phenotypic and genetic
analyses to characterize the role of Gl15 in the maize juvenile-to-adult
phase transition. Comparisons between Gl15-active and Gl15-inactive somatic
sectors in the leaves of variegated plants demonstrated that the Gl15 gene
product acts in a cell-autonomous manner to direct juvenile epidermal
differentiation but does not affect factors that regulate the overall
process of phase change. Examination of the gl15-m1 phenotype in the
Corngrass1, Teopod1, and Teopod2 mutant backgrounds showed that the
prolonged expression of juvenile epidermal traits associated with these
mutations also required Gl15 activity. These results support a model
whereby the cell-autonomous Gl15 gene product responds to a juvenility
program that operates throughout the vegetative shoot to condition the
juvenile differentiation of maize leaf epidermal cells.
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