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THE PLANT CELL, Vol 8, Issue 3 463-475, Copyright © 1996 by American Society of Plant Biologists
Leaf permease1 Gene of Maize Is Required for Chloroplast Development
N. P. Schultes, T. P. Brutnell, A. Allen, S. L. Dellaporta, T. Nelson and J. Chen
Department of Biology, Yale University, New Haven, Connecticut 06511
Adjacent bundle sheath and mesophyll cells cooperate for carbon fixation in
the leaves of C4 plants. Mutants with compromised plastid development
should reveal the degree to which this cooperation is obligatory, because
one can assay whether mesophyll cells with defective bundle sheath
neighbors retain C4 characteristics or revert to C3 photosynthesis. The
leaf permease1-mutable1 (lpe1-m1) mutant of maize exhibits disrupted
chloroplast ultrastructure, preferentially affecting bundle sheath
choroplasts under lower light. Despite the disrupted ultrastructure, the
metabolic cooperation of bundle sheath and mesophyll cells for C4
photosynthesis remains intact. To investigate this novel mutation, the
Activator transposon-tagged allele and cDNAs corresponding to the Lpe1 mRNA
from wild-type plants were cloned. The Lpe1 gene encodes a polypeptide with
significant similarity to microbial pyrimidine and purine transport
proteins. An analysis of revertant sectors generated by Activator excision
suggests that the Lpe1 gene product is cell autonomous and can be absent up
to the last cell divisions in the leaf primordium without blocking bundle
sheath chloroplast development.
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