Plant Physiology 79:1072-1076 (1985)
© 1985 American Society of Plant Biologists
Articles
Differential Expression of the Ribulose Bisphosphate Carboxylase Large Subunit Gene in Bundle Sheath and Mesophyll Cells of Developing Maize Leaves Is Influenced by Light 1
Jenq-Yunn Sheen and
Lawrence Bogorad
The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138
We have investigated the influence of light on the mRNA of the gene for the large subunit of ribulose-1,5-bisphosphate carboxylase in mesophyll and bundle sheath cells of the C4 plant Zea mays. The gene is transcribed in both cell types in leaves of seedlings grown in the dark. However, upon illumination, the level of mRNA declines and becomes undetectable in mesophyll cells after 72 hours. On the contrary, in bundle sheath cells the two transcripts of the same gene increase to peak after 24 hours of greening and then decrease to a steady state level. This study was made possible by the development of improved methods for the isolation of two maize leaf cell types suitable for the extraction of high quality RNAs at different developmental states, i.e. etiolated, greening and green.
1 This research was supported by a fellowship from Harvard University to J. S. and by a grant from the National Institute of General Medical Sciences. It was also supported in part by the Maria Moors Cabot Foundation of Harvard University.
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