Evolution of the grass leaf by primordium extension and petiole-lamina remodeling

Richardson, A. E., Cheng, J., Johnston, R., Kennaway, R., Conlon, B. R., Rebocho, A. B., Kong, H., Scanlon, M. J., Hake, S. and Coen, E. (2021) Evolution of the grass leaf by primordium extension and petiole-lamina remodeling. Science, 374 (6573). pp. 1377-1381. ISSN 0036-8075

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The sheathing leaf found in grasses and other monocots is an evolutionary innovation, yet its origin has been a subject of long-standing debate. Here, we revisit the problem in the light of developmental genetics and computational modeling. We show that the sheathing leaf likely arose through WOX-gene-dependent extension of a primordial zone straddling concentric domains around the shoot apex. Patterned growth within this zone, oriented by two polarity fields, accounts for wild-type, mutant and mosaic grass leaf development, whereas zone contraction and growth remodeling accounts for eudicot leaf development. In contrast to the prevailing view, our results suggest that the sheath derives from petiole, whereas the blade derives from the lamina of the eudicot leaf, consistent with homologies proposed in the 19th century.

Item Type: Article
Additional Information: Funding Information: This work was supported by a bilateral NSF/BIO-BBSRC grant (BB/M023117/1 to S.H. and E.C.); the BBSRC (grants BBS/E/J/000PR9787, BBS/E/J/00000152, BB/L008920/1, and BBS/E/J/000PR9789 to E.C.); and the NSF (grant DEB-1457070 to M.S.). H.K. received funding from the Chinese Academy of Sciences (grants XDB27010304 and ZDBS-LY-SM022) for J.C. A.R. is funded by University of Edinburgh start-up funds. The Cornell Institute of Biotechnology's Imaging Facility is supported by NYSTEM (C29155) and the NIH (S10OD018516).
Uncontrolled Keywords: homeobox gene,apical meristem,phyllode theory,lateral domain,shoot,expression,patterns,monocotyledons,growth,sheath,general ,/dk/atira/pure/subjectarea/asjc/1000
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Depositing User: LivePure Connector
Date Deposited: 19 Jan 2022 08:30
Last Modified: 23 Oct 2022 03:27
URI: https://ueaeprints.uea.ac.uk/id/eprint/83056
DOI: 10.1126/science.abf9407


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