Summer drought alters carbon allocation to roots and root respiration in mountain grassland

Drought affects the carbon (C) source and sink activities of plant organs, with potential consequences for belowground C allocation, a key process of the terrestrial C cycle. The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exc...

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Veröffentlicht in:The New phytologist 2015-02, Vol.205 (3), p.1117-1127
Hauptverfasser: Hasibeder, Roland, Fuchslueger, Lucia, Richter, Andreas, Bahn, Michael
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container_title The New phytologist
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creator Hasibeder, Roland
Fuchslueger, Lucia
Richter, Andreas
Bahn, Michael
description Drought affects the carbon (C) source and sink activities of plant organs, with potential consequences for belowground C allocation, a key process of the terrestrial C cycle. The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exclusion with¹³C pulse labelling in a mountain meadow to analyse the effects of summer drought on the dynamics of belowground allocation of recently assimilated C and how it is partitioned among different carbohydrate pools and root respiration. Severe soil moisture deficit decreased the ecosystem C uptake and the amounts and velocity of C allocated from shoots to roots. However, the proportion of recently assimilated C translocated belowground remained unaffected by drought. Reduced root respiration, reflecting reduced C demand under drought, was increasingly sustained by C reserves, whilst recent assimilates were preferentially allocated to root storage and an enlarged pool of osmotically active compounds. Our results indicate that under drought conditions the usage of recent photosynthates is shifted from metabolic activity to osmotic adjustment and storage compounds.
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The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exclusion with¹³C pulse labelling in a mountain meadow to analyse the effects of summer drought on the dynamics of belowground allocation of recently assimilated C and how it is partitioned among different carbohydrate pools and root respiration. Severe soil moisture deficit decreased the ecosystem C uptake and the amounts and velocity of C allocated from shoots to roots. However, the proportion of recently assimilated C translocated belowground remained unaffected by drought. Reduced root respiration, reflecting reduced C demand under drought, was increasingly sustained by C reserves, whilst recent assimilates were preferentially allocated to root storage and an enlarged pool of osmotically active compounds. 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subjects 13C pulse labelling
Altitude
Austria
belowground carbon allocation
Body organs
carbohydrate pools
Carbohydrates
Carbohydrates - analysis
Carbon
Carbon - metabolism
Carbon dioxide
Carbon Dioxide - metabolism
Carbon Isotopes
Cell Respiration
Drought
Droughts
Dynamics
ecosystems
Grassland
Grassland soils
Grasslands
Labeling
meadows
Microclimate
Mountains
Organs
osmotic adjustment
Photosynthates
Plant organs
Plant roots
Plant Roots - metabolism
Plant Shoots - metabolism
Plants
Rain
Respiration
root respiration
Roots
Seasons
Shoots
Soil
Soil moisture
Soil respiration
soil water deficit
Starches
Storage
Summer
Temperature
Terrestrial environments
Time Factors
Tracer bullets
Uptake
title Summer drought alters carbon allocation to roots and root respiration in mountain grassland
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