ATTENTION: The software behind KU ScholarWorks is being upgraded to a new version. Starting July 15th, users will not be able to log in to the system, add items, nor make any changes until the new version is in place at the end of July. Searching for articles and opening files will continue to work while the system is being updated.
If you have any questions, please contact Marianne Reed at mreed@ku.edu .
Secondary Growth in Vertebraria Roots from the Late Permian of Antarctica: A Change in Developmental Timing
dc.contributor.author | Decombeix, Anne-Laure | |
dc.contributor.author | Taylor, Edith L. | |
dc.contributor.author | Taylor, Thomas N. | |
dc.date.accessioned | 2014-05-20T14:51:51Z | |
dc.date.available | 2014-05-20T14:51:51Z | |
dc.date.issued | 2009-06-01 | |
dc.identifier.citation | Anne‐Laure Decombeix, Edith L. Taylor, and Thomas N. Taylor. "Secondary Growth in Vertebraria Roots from the Late Permian of Antarctica: A Change in Developmental Timing." International Journal of Plant Sciences, Vol. 170, No. 5 (June 2009), pp. 644-656. http://www.dx.doi.org/10.1086/597784. | |
dc.identifier.uri | http://hdl.handle.net/1808/13690 | |
dc.description | This is the publisher's version, also available electronically from http://www.jstor.org/stable/10.1086/597784. | |
dc.description.abstract | Permineralized Vertebraria roots from the late Permian of the Central Transantarctic Mountains, Antarctica, are investigated to understand the unusual vascular anatomy of the genus. The specimens range from ∼1 mm to several centimeters in diameter and illustrate all the stages of secondary growth. Our observations confirm previous hypotheses on the development of these roots and suggest that their unique anatomy is the result of a change in developmental timing. Vertebraria is characterized by a vascular cambium that remains discontinuous through several growth seasons, leading to the formation of lacunae alternating in cross section with wedges of secondary vascular tissues. The bifacial nature of the cambium is confirmed by the presence of well‐developed secondary phloem composed of longitudinally elongated cells and uniseriate parenchymatous rays. In some of the largest specimens, a continuous vascular cylinder is formed by the differentiation of cambium from parenchymatous cells bordering the lacunae. The new specimens provide additional information on the secondary xylem anatomy and vascular connection to lateral roots. | |
dc.publisher | The University of Chicago Press | |
dc.subject | Permian | |
dc.subject | Antarctica | |
dc.subject | Glossopteridales | |
dc.subject | Roots | |
dc.subject | Vertebraria | |
dc.subject | Anatomy | |
dc.subject | Development | |
dc.title | Secondary Growth in Vertebraria Roots from the Late Permian of Antarctica: A Change in Developmental Timing | |
dc.type | Article | |
kusw.kuauthor | Decombeix, Anne-Laure | |
kusw.kuauthor | Taylor, Edith L. | |
kusw.kuauthor | Taylor, Thomas N. | |
kusw.kudepartment | Ecology and Evolutionary Biology | |
kusw.kudepartment | Biodiversity Institute | |
kusw.oastatus | fullparticipation | |
dc.identifier.doi | 10.1086/597784 | |
kusw.oaversion | Scholarly/refereed, publisher version | |
kusw.oapolicy | This item meets KU Open Access policy criteria. | |
dc.rights.accessrights | openAccess |