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bundle sheath defective2, a mutation that disrupts the coordinated development of bundle sheath and mesophyll cells in the maize leaf (1996)
| Content Provider | CiteSeerX |
|---|---|
| Author | Langdale, Jane A. Roth, Ronelle Hall, Lisa N. Brutnell, Thomas P. |
| Abstract | Within the maize leaf primordium, coordinated cell division and differentiation patterns result in the development of two morphologically and biochemically distinct photosynthetic cell types, the bundle sheath and the mesophyll. The bundle sheath defective2-mutablel (bsd2-ml) mutation specifically disrupts C4 differentiation in bundle sheath cells in that the levels of bundle sheath cell-specific photosynthetic enzymes are reduced and the bundle sheath chloroplast structure is aberrant. In contrast, mesophyll cell-specific enzymes accumulate to normal levels, and the mesophyll cell chloroplast structure is not perturbed. Throughout mutant leaf development, the large and small subunits of ribulose bisphosphate carboxylase are absent; however, both rbcL and RbcS transcripts accumulate. Moreover, chloroplast-encoded rbcL tran-scripts accumulate ectopically in mesophyll cells. Although the bundle sheath cell chloroplast structure deteriorates rapidly when plants are exposed to light, this deterioration is most likely a secondary effect resulting from cell-specific photooxidative damage. Therefore, we propose that the Bsd2 gene plays a direct role in the post-transcriptional control of rbcL transcript accumulation and/or translation, both in bundle sheath and mesophyll cells, and an indirect role in the maintenance of bundle sheath cell chloroplast structure. |
| File Format | |
| Journal | Plant Cell |
| Publisher Date | 1996-01-01 |
| Access Restriction | Open |
| Subject Keyword | Mesophyll Cell-specific Enzyme Normal Level Small Subunit Bsd2 Gene Post-transcriptional Control Bundle Sheath Defective2 Distinct Photosynthetic Cell Type C4 Differentiation Coordinated Development Indirect Role Cell Division Secondary Effect Mesophyll Cell Chloroplast Structure Cell-specific Photooxidative Damage Bundle Sheath Defective2-mutablel Direct Role Chloroplast-encoded Rbcl Tran-scripts Accumulate Mesophyll Cell Maize Leaf Bundle Sheath Cell Chloroplast Structure Bundle Sheath Cell Rbcl Transcript Accumulation Bundle Sheath Cell-specific Photosynthetic Enzyme Differentiation Pattern Result Bundle Sheath Chloroplast Structure Bundle Sheath Rbc Transcript Throughout Mutant Leaf Development Ribulose Bisphosphate Carboxylase Maize Leaf Primordium |
| Content Type | Text |
