RedundantSCARECROWgenes pattern distinct cell layers in roots and leaves of maize
| Autor: | Hao Wu, Thomas E. Hughes, Olga V. Sedelnikova, Jane A. Langdale, Philip W. Becraft |
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| Rok vydání: | 2019 |
| Předmět: |
Cell
Mutant Gene Dosage Sequence Homology Biology Photosynthesis Plant Roots Zea mays 03 medical and health sciences 0302 clinical medicine Gene Expression Regulation Plant Mesophyll Gene Duplication medicine Kranz Primordium Molecular Biology Gene Phylogeny 030304 developmental biology 0303 health sciences Leucine Zippers Radial-patterning Arabidopsis Proteins food and beverages Gene Expression Regulation Developmental Meristem Plants Genetically Modified Vascular bundle Maize Cell biology DNA-Binding Proteins Plant Leaves SCARECROW medicine.anatomical_structure Multigene Family Bundle-sheath Endodermis 030217 neurology & neurosurgery Developmental Biology Research Article |
| Zdroj: | Development (Cambridge, England) |
| DOI: | 10.1101/567156 |
| Popis: | The highly efficient C4 photosynthetic pathway is facilitated by ‘Kranz’ leaf anatomy. In Kranz leaves, closely spaced veins are encircled by concentric layers of photosynthetic bundle sheath (inner) and mesophyll (outer) cells. Here, we demonstrate that, in the C4 monocot maize, Kranz patterning is regulated by redundant function of SCARECROW 1 (ZmSCR1) and a previously uncharacterized homeologue: ZmSCR1h. ZmSCR1 and ZmSCR1h transcripts accumulate in ground meristem cells of developing leaf primordia and in Zmscr1;Zmscr1h mutant leaves, most veins are separated by one rather than two mesophyll cells; many veins have sclerenchyma above and/or below instead of mesophyll cells; and supernumerary bundle sheath cells develop. The mutant defects are unified by compromised mesophyll cell development. In addition to Kranz defects, Zmscr1;Zmscr1h mutants fail to form an organized endodermal layer in the root. Collectively, these data indicate that ZmSCR1 and ZmSCR1h redundantly regulate cell-type patterning in both the leaves and roots of maize. Leaf and root pathways are distinguished, however, by the cell layer in which they operate – mesophyll at a two-cell distance from leaf veins versus endodermis immediately adjacent to root vasculature. Summary: Two duplicated maize SCARECROW genes control the development of the endodermis in roots and the mesophyll in leaves. |
| Databáze: | OpenAIRE |
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