Heterogeneity in short-term allocation of carbon to roots of Pinus tabuliformis seedlings and root respiration under dro
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Heterogeneity in short-term allocation of carbon to roots of Pinus tabuliformis seedlings and root respiration under drought stress Ying Liu & Peng Li Yu & Peng Shi
&
Lie Xiao & Wen Wang & Kunxia
Received: 8 October 2019 / Accepted: 7 May 2020 # Springer Nature Switzerland AG 2020
Abstract Aims The purpose of this study was to investigate the drought response mechanisms that underlie carbon allocation and carbon demand in roots. Methods The correlations between root traits and the amount of carbon (C) allocated to different orders of roots were tested using 13C pulse labeling. The amount of 13C was measured by quantifying the CO2 emitted from respiring roots of Pinus tabuliformis excised 0, 1, 3, 9, 21, 81 and 120 days after labeling. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04562-9) contains supplementary material, which is available to authorized users. Y. Liu : P. Li (*) : L. Xiao (*) : W. Wang : K. Yu : P. Shi State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 Shaanxi Province, China e-mail: [email protected] e-mail: [email protected] Y. Liu : P. Li : L. Xiao : W. Wang : K. Yu : P. Shi Xi’an University of Technology, Xi’an, Shaanxi 710048, The People’s Republic of China Y. Liu : P. Li : L. Xiao : W. Wang : K. Yu : P. Shi State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi’an, Shaanxi 710048, The People’s Republic of China Y. Liu : P. Li : L. Xiao : W. Wang : K. Yu : P. Shi Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid Regions, Xi’an University of Technology, Xi’an, Shaanxi 710048, The People’s Republic of China
Results 1) Moderate drought stress significantly increased the root to shoot biomass ratio, the biomass ratio of the first three orders to the 4th- and 5th-order roots, and the cumulative root length and root area of the 1storder roots. 2) 120 days after labeling, 13C amount allocated to 1st- and 2nd-order roots was significantly higher in all drought stress treatments than adequate water supply treatment, with the exception of 13 C in 1st-order roots undergoing the severe drought stress treatment. Root respiration was significantly and positively correlated with 13C in the 1st- and 2nd-order roots in all drought stress treatments. 3) The 13C ratios of all the droughted treatments vs water supply treatment were significantly higher in the 1st- and 2nd-order roots than in the 4th- and 5thorder roots, with the exception of the 1st-order roots in the most severe drought treatment. Conclusions Drought stress elevated C demand in lower-order roots by increasing the lower-order root respiration rate and by expanding the photosynthate allocation to the fine roots to enhance their structural growth. Keywords Photosynthates . Respiration from excised roots . Drought stress . Stable carbon isotope . Short-term carbon
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