Redundant <i>SCARECROW</i> genes pattern distinct cell layers in roots and leaves of maize
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- Thomas E. Hughes
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
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- Olga V. Sedelnikova
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
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- Hao Wu
- Genetics, Development, and Cell Biology Department, Iowa State University, Ames, Iowa, 50011, USA
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- Philip W. Becraft
- Genetics, Development, and Cell Biology Department, Iowa State University, Ames, Iowa, 50011, USA
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- Jane A. Langdale
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
抄録
<jats:p>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 homeolog 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 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.</jats:p>
収録刊行物
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- Development
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Development 146 dev177543-, 2019-01-01
The Company of Biologists