Abstract
Main conclusion Cold acclimation is revealed through induced stem respiration during pre-winter frost of native Pistacia integerrima trees in continental semi-arid environments.
Semi-arid environments challenge vegetation by simultaneous abiotic stresses. In this study, we examine the combined effects of water stress and frost on the physiology of Pistacia integerrima stems. This species is native to semi-arid environments where drought and frost frequently co-occur. We quantified carbohydrates and proline in P. integerrima stems responding to frost and experiencing water potentials between −0.2 and −1.8 MPa. We report that dehydrated trees (i.e., Ψstem <=−1 MPa) had more soluble sugars and proline than the well-watered trees (−0.2 MPa). The dehydrated trees also froze at lower temperatures and were less damaged by freezing. Interestingly, we observed a significant increase in stem CO2 efflux at near-freezing temperatures that could be linked to frost protection. This novel finding challenges current paradigm of plant respiration-kinetics which predicts, according to Arrhenius equation, lower respiration rates during frost. Our results support the notion that drought and frost are analogous stresses that can independently activate corresponding physiological processes in trees and amplify protection. This inevitable stress response ‘collaboration’ may be the key to understanding how non-dormant perennial plants survive the highly variable weather patterns of early winters in semi-arid environments.
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Abbreviations
- SC:
-
Soluble carbohydrates
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Acknowledgements
Our research was supported and partially Funded by the California Pistachio Research Board. Plant material was donated by Duarte Trees and Vines (Hughson, CA, USA).
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Sperling, O., Secchi, F., Godfrey, J. et al. Acclimation of Pistacia integerrima trees to frost in semi-arid environments depends on autumn’s drought. Planta 245, 671–679 (2017). https://doi.org/10.1007/s00425-016-2629-9
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DOI: https://doi.org/10.1007/s00425-016-2629-9