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THE PLANT CELL, Vol 5, Issue 3 289-296, Copyright © 1993 by American Society of Plant Biologists
Carbon Sink-to-Source Transition Is Coordinated with Establishment of Cell-Specific Gene Expression in a C4 Plant
J. L. Wang, R. Turgeon, J. P. Carr and J. O. Berry
Department of Biological Sciences, State University of New York, Buffalo, New York 14260
Plants that use the highly efficient C4 photosynthetic pathway possess two
types of specialized leaf cells, the mesophyll and bundle sheath. In mature
C4 leaves, the CO2 fixation enzyme ribulose-1,5-bisphosphate carboxylase
(RuBPCase) is specifically compartmentalized to the bundle sheath cells.
However, in very young leaves of amaranth, a dicotyledonous C4 plant, genes
encoding the large subunit and small subunit of RuBPCase are initially
expressed in both photosynthetic cell types. We show here that the RuBPCase
mRNAs and proteins become specifically localized to leaf bundle sheath
cells during the developmental transition of the leaf from carbon sink to
carbon source. Bundle sheath cell-specific expression of RuBPCase genes and
the sink-to-source transition began initially at the leaf apex and
progressed rapidly and coordinately toward the leaf base. These findings
demonstrated that two developmental transitions, the change in
photoassimilate transport status and the establishment of bundle sheath
cell-specific RuBPCase gene expression, are tightly coordinated during C4
leaf development. This correlation suggests that processes associated with
the accumulation and transport of photosynthetic compounds may influence
patterns of photosynthetic gene expression in C4 plants.
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