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Dynamics of non-structural carbohydrates in terrestrial plants : a global synthesis
Martínez Vilalta, Jordi, 1975- (Centre de Recerca Ecològica i Aplicacions Forestals)
Sala, Anna (University of Montana. Division of Biological Sciences)
Asensio Abella, Ma. Dolores (Centre de Recerca Ecològica i Aplicacions Forestals)
Galiano Pérez, Lucía (University of Freiburg. Institute of Hydrology)
Hoch, Günter (Universität Basel. Departement Umweltwissenschaften)
Palacio Blasco, Sara (Instituto Pirenaico de Ecología. CSIC)
Piper, Frida I. (Centro de Investigación en Ecosistemas de la Patagonia)
Lloret Maya, Francisco (Centre de Recerca Ecològica i Aplicacions Forestals)

Date: 2016
Abstract: Plants store large amounts of non-structural carbohydrates (NSC). While multiple functions of NSC have long been recognized, the interpretation of NSC seasonal dynamics is often based on the idea that stored NSC is a reservoir of carbon that fluctuates depending on the balance between supply via photosynthesis and demand for growth and respiration (the source-sink dynamics concept). Consequently, relatively high NSC concentrations in some plants have been interpreted to reflect excess supply relative to demand. An alternative view, however, is that NSC accumulation reflects the relatively high NSC levels required for plant survival; an important issue that remains highly controversial. Here, we assembled a new global database to examine broad patterns of seasonal NSC variation across organs (leaves, stems, and belowground), plant functional types (coniferous, drought-deciduous angiosperms, winter deciduous angiosperms, evergreen angiosperms, and herbaceous) and biomes (boreal, temperate, Mediterranean, and tropical). We compiled data from 121 studies, including seasonal measurements for 177 species under natural conditions. Our results showed that, on average, NSC account for ~10% of dry plant biomass and are highest in leaves and lowest in stems, whereas belowground organs show intermediate concentrations. Total NSC, starch, and soluble sugars (SS) varied seasonally, with a strong depletion of starch during the growing season and a general increase during winter months, particularly in boreal and temperate biomes. Across functional types, NSC concentrations were highest and most variable in herbaceous species and in conifer needles. Conifers showed the lowest stem and belowground NSC concentrations. Minimum NSC values were relatively high (46% of seasonal maximums on average for total NSC) and, in contrast to average values, were similar among biomes and functional types. Overall, although starch depletion was relatively common, seasonal depletion of total NSC or SS was rare. These results are consistent with a dual view of NSC function: whereas starch acts mostly as a reservoir for future use, soluble sugars perform immediate functions (e. g. , osmoregulation) and are kept above some critical threshold. If confirmed, this dual function of NSC will have important implications for the way we understand and model plant carbon allocation and survival under stress.
Note: Número d'acord de subvenció MINECO/CGL2015-6741-R
Note: Número d'acord de subvenció MINECO/CGL2013-46808-R
Note: Número d'acord de subvenció MINECO/RYC-2013-14164
Note: Número d'acord de subvenció MINECO/CGL2012-32965
Note: Número d'acord de subvenció MINECO/CGL2010-16373
Note: Número d'acord de subvenció AGAUR/2014/SGR-453
Rights: Tots els drets reservats
Language: Anglès
Document: article ; recerca ; acceptedVersion
Subject: Carbon storage ; Global synthesis ; Non-structural carbon compounds ; NSC ; Osmoregulation ; Plant carbon economy ; Seasonal dynamics ; Soluble sugars ; Starch ; Source-sink imbalances ; Stress responses ; Terrestrial plants
Published in: Ecological monographs, Vol. 86, issue 4 (Nov. 2016) , p. 495-516, ISSN 0012-9615

DOI: 10.1002/ecm.1231

Post-print. Article
73 p, 3.9 MB

Post-print. Suplement 1
22 p, 352.6 KB

Post-print. Suplement 2
11 p, 991.4 KB

Post-print. Suplement 3
7 p, 364.5 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles

 Record created 2018-02-27, last modified 2020-08-09

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