Crown development of a clone of Populus tremuloides exhibiting "crooked" architecture and a comparison with wild-type trees

Simple item page
dc.contributor.authorRemphrey, WR
dc.contributor.authorPearn, LP
dc.date.accessioned2007-10-11T14:27:03Z
dc.date.available2007-10-11T14:27:03Z
dc.date.issued2003-04-30
dc.description.abstractPopulus tremuloides Michx. (trembling aspen) is a tree species native to much of North America and is normally ascribed to the architectural model of Rauh, characterized by an excurrent crown structure with a central main stem and orthotropic branches. A mutant clone of trembling aspen is located near Hafford, Saskatchewan, exhibiting an architecture with crooked and twisted tree trunks. It was the objective of the present study to determine how the architectural development of the crooked clone differed from the wild type. In a study conducted over a 5-year period, four mutant trees were compared with four young wild-type aspen in the Winnipeg, Manitoba, area. Based on detailed quantitative data, it was determined that the architecture of the crooked clone of aspen differs greatly from the wild type. The trees are built by the continuous superposition of vigorous relay shoots with a mixed orientation, that is, shoots that take over the main growth of the tree, and have a more or less upright basal part and a horizontal to pendulous distal part. The development of the crookedness starts with the bending of the relay shoots, mostly in relation to the gravitational direction, which is followed in the subsequent years by various gravimorphic responses. In particular, the longest lateral shoots on a parent relay shoot occur in the middle regions, and the tip of the parent relay shoot generally loses vigour over time. The parent shoot may die back to the junction with a daughter relay shoot, causing a sharp bend at that point. Moreover, the divergence angles of relay shoots with the parent shoots were shown to be greater than in wild-type aspen, and this appears to exacerbate the crookedness. The new relay shoot may actually grow back towards the centre of the crown, opposite to the direction of growth of the parent. The results of this study demonstrate how a quantitative change in one architectural character can set in motion a series of developmental processes that result in a vastly different crown structure from the wild type.en
dc.format.extent2060685 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citation0008-4026; CAN J BOT, APR 2003, vol. 81, no. 4, p.345 to 359.en
dc.identifier.doihttp://dx.doi.org/10.1139/b03-028
dc.identifier.urihttp://hdl.handle.net/1993/2941
dc.language.isoengen_US
dc.rightsNo part of the NRC Research Press electronic journals may be reproduced, stored, or transmitted in any form or by any means, without the written permission of the publisher, except as stated below. Under the Canadian Copyright Act, individuals may download or print single copies of articles for personal research or study. Any person may reproduce short excerpts from articles in the journals for any purpose that respects the moral rights of authors, provided that the source is fully acknowledged. As a courtesy, the consent of authors of such material should be obtained directly from the author. Authorization to reproduce items for other than personal research or study, as stated above, may be obtained via Access © upon payment of the copyright fee of $10.00 per copy. NRC Research Press also extends certain additional rights to authors. The above rights do not extend to copying or reproduction for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. For such copying or reproduction, arrangements must be made with NRC Research Press.en
dc.rightsopen accessen_US
dc.statusPeer revieweden
dc.subjectPopulus tremuloidesen
dc.subjecttrembling aspenen
dc.subjectarchitectureen
dc.subjectcrooked cloneen
dc.subjectINTENSIVELY CULTURED POPULUSen
dc.subjectBRANCH CHARACTERISTICSen
dc.subjectTORTUOSA PEPINen
dc.subjectSHORT-ROTATIONen
dc.subjectGRAVITROPISMen
dc.subjectPLANTSen
dc.subjectSHOOTSen
dc.subjectGROWTHen
dc.subjectMODELen
dc.titleCrown development of a clone of Populus tremuloides exhibiting "crooked" architecture and a comparison with wild-type treesen
dc.typejournal articleen_US
Files
Collections
University of Manitoba Scholarship (login required)