Lenka Plavcová1, Günter Hoch2, Hugh Morris3, Sara Ghiasi3, Steven Jansen3. 1. Institute for Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany lenka.plavcova@gmail.com. 2. Department of Environmental Sciences-Botany, University of Basel, Schönbeinstrasse 6, CH-4056 Basel, Switzerland. 3. Institute for Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany.
Abstract
PREMISE OF THE STUDY: Concentrations of nonstructural carbohydrates (NSCs) are used as proxies for the net carbon balance of trees and as indicators of carbon starvation resulting from environmental stress. Woody organs are the largest NSC-storing compartments in forest ecosystems; therefore, it is essential to understand the factors that affect the size of this important storage pool. In wood, NSC are predominantly deposited in ray and axial parenchyma (RAP); however, direct links between nutrient storage and RAP anatomy have not yet been established. Here, we tested whether the NSC storage capacity of wood is influenced by the amount of RAP. METHODS: We measured NSC concentrations and RAP fractions in root and stem sapwood of 12 temperate species sampled at the onset of winter dormancy and in stem sapwood of four tropical trees growing in an evergreen lowland rainforest. The patterns of starch distribution were visualized by staining with Lugol's solution. KEY RESULTS: The concentration of NSCs in sapwood of temperate trees scales tightly with the amount of RAP and living fibers (LFs), with almost all RAP and LFs being densely packed with starch grains. In contrast, the tropical species had lower NSC concentrations despite their higher RAP and LFs fraction and had considerable interspecific differences in starch distribution. CONCLUSIONS: The differences in RAP and LFs abundance affect the ability of sapwood to store NSC in temperate trees, whereas a more diverse set of functions of RAP might be pronounced in species growing in a tropical environment with little seasonality.
PREMISE OF THE STUDY: Concentrations of nonstructural carbohydrates (NSCs) are used as proxies for the net carbon balance of trees and as indicators of carbon starvation resulting from environmental stress. Woody organs are the largest NSC-storing compartments in forest ecosystems; therefore, it is essential to understand the factors that affect the size of this important storage pool. In wood, NSC are predominantly deposited in ray and axial parenchyma (RAP); however, direct links between nutrient storage and RAP anatomy have not yet been established. Here, we tested whether the NSC storage capacity of wood is influenced by the amount of RAP. METHODS: We measured NSC concentrations and RAP fractions in root and stem sapwood of 12 temperate species sampled at the onset of winter dormancy and in stem sapwood of four tropical trees growing in an evergreen lowland rainforest. The patterns of starch distribution were visualized by staining with Lugol's solution. KEY RESULTS: The concentration of NSCs in sapwood of temperate trees scales tightly with the amount of RAP and living fibers (LFs), with almost all RAP and LFs being densely packed with starch grains. In contrast, the tropical species had lower NSC concentrations despite their higher RAP and LFs fraction and had considerable interspecific differences in starch distribution. CONCLUSIONS: The differences in RAP and LFs abundance affect the ability of sapwood to store NSC in temperate trees, whereas a more diverse set of functions of RAP might be pronounced in species growing in a tropical environment with little seasonality.
Authors: Hugh Morris; Ari M Hietala; Steven Jansen; Javier Ribera; Sabine Rosner; Khalifah A Salmeia; Francis W M R Schwarze Journal: Ann Bot Date: 2020-04-25 Impact factor: 4.357
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
Authors: Maxime Cailleret; Vasilis Dakos; Steven Jansen; Elisabeth M R Robert; Tuomas Aakala; Mariano M Amoroso; Joe A Antos; Christof Bigler; Harald Bugmann; Marco Caccianaga; Jesus-Julio Camarero; Paolo Cherubini; Marie R Coyea; Katarina Čufar; Adrian J Das; Hendrik Davi; Guillermo Gea-Izquierdo; Sten Gillner; Laurel J Haavik; Henrik Hartmann; Ana-Maria Hereş; Kevin R Hultine; Pavel Janda; Jeffrey M Kane; Viachelsav I Kharuk; Thomas Kitzberger; Tamir Klein; Tom Levanic; Juan-Carlos Linares; Fabio Lombardi; Harri Mäkinen; Ilona Mészáros; Juha M Metsaranta; Walter Oberhuber; Andreas Papadopoulos; Any Mary Petritan; Brigitte Rohner; Gabriel Sangüesa-Barreda; Jeremy M Smith; Amanda B Stan; Dejan B Stojanovic; Maria-Laura Suarez; Miroslav Svoboda; Volodymyr Trotsiuk; Ricardo Villalba; Alana R Westwood; Peter H Wyckoff; Jordi Martínez-Vilalta Journal: Front Plant Sci Date: 2019-01-08 Impact factor: 5.753