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High Heterogeneity of Root Carbon Allocation Affects Root Turnover Rate and Production of Bothriochloa ischaemum Under Drought Stress

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Abstract

The mechanism that causes the difference in carbon (C) turnover rate in root populations is unclear. The carbon utilization strategy is assumed to be the main causal factor responsible for differences in root turnover rate. In this study, we determined the correlations between root turnover rate, production, and proportions of C allocated to roots using 13CO2 as a labeling gas in a 13C pulse labeling experiment. The proportions of δ13C were measured in various organs of the grass Bothriochloa ischaemum sampled 0, 6, 24, 48, 216, and 360 h after labeling in three treatments: control (CK), mild water stress (MS), and serious water stress (SS). We found that drought stress increased short-term C allocation to belowground. Fine roots have stronger C demand than coarse root under drought condition. The amount of 13C gradually decreased in leaves and increased in soil with time after 13C pulse labeling. Stem 13C increased with the level of stress and peaked at 24 h, while both fine- and coarse-root 13C peaked at 216 h. 13C distributed to fine roots in MS was significantly higher than in the other treatments at 216 h. The fine-root turnover rate in SS treatment was positively correlated with root biomass but not the amount of 13C. Larger C allocation to roots increased fine-root mass in MS, stimulated rapid fine-root turnover, and increased C input to both the rhizosphere and soil. The fine-root turnover in CK was significantly positively correlated with both 13C amount and biomass, which indicated that increasing short-term C input accelerated turnover in the fine-root pool. The C allocation difference between the fine roots and coarse roots may be a key cause of the different turnover rate in the root population.

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Acknowledgements

This research was funded by National key research and development program (Nos. 2016YFC0402407, 2016YFC0402404, and 2016ZZKT-13), National Natural Science Foundation of China (No. 41561144011), and the School foundation of Xi’an University of Technology (310–252071506).

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Authors and Affiliations

  1. Xi’an University of Technology, Xi’an, People’s Republic of China

    Ying Liu, Peng Li, Lie Xiao, Kuxia Yu & Wen Wang

  2. State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an, People’s Republic of China

    Ying Liu, Peng Li, Lie Xiao & Kuxia Yu

  3. Key Laboratory of State Forestry Administration on Soil & Water Conservation and Ecological Restoration, Beijing, China

    Ying Liu, Peng Li & Lie Xiao

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  1. Ying Liu
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Liu, Y., Li, P., Xiao, L. et al. High Heterogeneity of Root Carbon Allocation Affects Root Turnover Rate and Production of Bothriochloa ischaemum Under Drought Stress. J Plant Growth Regul 40, 226–239 (2021). https://doi.org/10.1007/s00344-020-10090-8

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