Título
Allometry of root branching and its relationship to root morphological and functional traits in three range grasses
Autor
JOSE TULIO ARREDONDO MORENO
Douglas A. Johnson
Nivel de Acceso
Acceso Abierto
Identificador alterno
doi: https://doi.org/10.1093/jxb/err240
Materias
Bluebunch wheatgrass - (AUTOR) Cheatgrass - (AUTOR) Crested wheatgrass - (AUTOR) Exploitation efficiency - (AUTOR) Exploitation potential - (AUTOR) Root allometry - (AUTOR) Root morphology - (AUTOR) BIOLOGÍA Y QUÍMICA - (CTI) CIENCIAS DE LA VIDA - (CTI) BIOLOGÍA VEGETAL (BOTÁNICA) - (CTI) BIOLOGÍA VEGETAL (BOTÁNICA) - (CTI)
Resumen o descripción
"The study of proportional relationships between size, shape, and function of part of or the whole organism is traditionally known as allometry. Examination of correlative changes in the size of interbranch distances (IBDs) at different root orders may help to identify root branching rules. Root morphological and functional characteristics in three range grasses {bluebunch wheatgrass [Pseudoroegneria spicata (Pursh) Löve], crested wheatgrass [Agropyron desertorum (Fisch. ex Link) Schult.×A. cristatum (L.) Gaert.], and cheatgrass (Bromus tectorum L.)} were examined in response to a soil nutrient gradient. Interbranch distances along the main root axis and the first-order laterals as well as other morphological and allocation root traits were determined. A model of nutrient diffusivity parameterized with root length and root diameter for the three grasses was used to estimate root functional properties (exploitation efficiency and exploitation potential). The results showed a significant negative allometric relationship between the main root axis and first-order lateral IBD (P ?0.05), but only for bluebunch wheatgrass. The main root axis IBD was positively related to the number and length of roots, estimated exploitation efficiency of second-order roots, and specific root length, and was negatively related to estimated exploitation potential of first-order roots. Conversely, crested wheatgrass and cheatgrass, which rely mainly on root proliferation responses, exhibited fewer allometric relationships. Thus, the results suggested that species such as bluebunch wheatgrass, which display slow root growth and architectural root plasticity rather than opportunistic root proliferation and rapid growth, exhibit correlative allometry between the main axis IBD and morphological, allocation, and functional traits of roots."
Editor
Oxford University Press
Fecha de publicación
2011
Tipo de publicación
Artículo
Versión de la publicación
Versión publicada
Recurso de información
Formato
application/pdf
Sugerencia de citación
J. Tulio Arredondo, Douglas A. Johnson, Allometry of root branching and its relationship to root morphological and functional traits in three range grasses, Journal of Experimental Botany, Volume 62, Issue 15, November 2011, Pages 5581–5594, https://doi.org/10.1093/jxb/err240
Repositorio Orígen
Repositorio IPICYT
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