Loïc Pagès1, Jocelyne Kervella2. 1. INRA, Centre PACA, UR 1115 PSH, Domaine Saint-Paul, Site Agroparc, Avignon cedex 9, France. 2. INRA, Centre PACA, UR 1052 GAFL, Domaine Saint-Maurice, Montfavet cedex, France.
Abstract
Background and Aims: In several disciplines, identifying relevant root traits to characterize the root system architecture of species or genotypes is a crucial step. To address this question, we analysed the inter-specific variations of root architectural traits in two contrasting environments. Methods: We sampled 60 species in natura, at two sites, each presenting homogeneous soil conditions. We estimated for each species and site a set of five traits used for the modelling of the root system architecture: extreme tip diameters (Dmin and Dmax), relative diameter range (Drange), mean inter-branch distance (IBD) and dominance slope between the diameters of parent and lateral roots (DlDm). Key Results: The five traits presented a highly significant species effect, explaining between 77 and 98 % of the total variation. Dmin, Dmax and Drange were particularly determined by the species, while DlDm and IBD exhibited a higher percentage of environmental variations. These traits make it possible to confirm two main axes of variation: 'fineness-density' (defined by Dmin and IBD) and 'dominance-heterorhizy' (DlDm and Drange), that together accounted for 84 % of the variations observed. Conclusions: We confirmed the interest of these traits in the characterization of the root system architecture in ecology and genetics, and suggest using them to enrich the 'root economic spectrum'.
Background and Aims: In several disciplines, identifying relevant root traits to characterize the root system architecture of species or genotypes is a crucial step. To address this question, we analysed the inter-specific variations of root architectural traits in two contrasting environments. Methods: We sampled 60 species in natura, at two sites, each presenting homogeneous soil conditions. We estimated for each species and site a set of five traits used for the modelling of the root system architecture: extreme tip diameters (Dmin and Dmax), relative diameter range (Drange), mean inter-branch distance (IBD) and dominance slope between the diameters of parent and lateral roots (DlDm). Key Results: The five traits presented a highly significant species effect, explaining between 77 and 98 % of the total variation. Dmin, Dmax and Drange were particularly determined by the species, while DlDm and IBD exhibited a higher percentage of environmental variations. These traits make it possible to confirm two main axes of variation: 'fineness-density' (defined by Dmin and IBD) and 'dominance-heterorhizy' (DlDm and Drange), that together accounted for 84 % of the variations observed. Conclusions: We confirmed the interest of these traits in the characterization of the root system architecture in ecology and genetics, and suggest using them to enrich the 'root economic spectrum'.
Authors: M Luke McCormack; Ian A Dickie; David M Eissenstat; Timothy J Fahey; Christopher W Fernandez; Dali Guo; Heljä-Sisko Helmisaari; Erik A Hobbie; Colleen M Iversen; Robert B Jackson; Jaana Leppälammi-Kujansuu; Richard J Norby; Richard P Phillips; Kurt S Pregitzer; Seth G Pritchard; Boris Rewald; Marcin Zadworny Journal: New Phytol Date: 2015-03-10 Impact factor: 10.151
Authors: Grégoire T Freschet; Loïc Pagès; Colleen M Iversen; Louise H Comas; Boris Rewald; Catherine Roumet; Jitka Klimešová; Marcin Zadworny; Hendrik Poorter; Johannes A Postma; Thomas S Adams; Agnieszka Bagniewska-Zadworna; A Glyn Bengough; Elison B Blancaflor; Ivano Brunner; Johannes H C Cornelissen; Eric Garnier; Arthur Gessler; Sarah E Hobbie; Ina C Meier; Liesje Mommer; Catherine Picon-Cochard; Laura Rose; Peter Ryser; Michael Scherer-Lorenzen; Nadejda A Soudzilovskaia; Alexia Stokes; Tao Sun; Oscar J Valverde-Barrantes; Monique Weemstra; Alexandra Weigelt; Nina Wurzburger; Larry M York; Sarah A Batterman; Moemy Gomes de Moraes; Štěpán Janeček; Hans Lambers; Verity Salmon; Nishanth Tharayil; M Luke McCormack Journal: New Phytol Date: 2021-11 Impact factor: 10.323