Abstract
Pressure–volume (P–V) curves are frequently used to analyze water relation properties of woody plants in response to transpiration-induced tissue water loss. In this study, P–V analyses were conducted on eight woody species growing in the semiarid Loess Plateau region of China during a relatively dry summer season using both the recently recommended instantaneous measurement and the traditional method with rehydration pretreatment. Generally, P–V-derived parameters in this study reflected conditions in a dry growth environment. Species-specific differences were also found among P–V parameters, suggesting each species uses different mechanisms to respond to drought. Based on the results from instantaneous measurements, a descending sequence for drought tolerance ranked by water potentials at the turgor loss point (Ψtlp) was Rosa hugonis > Syringa oblata = Armeniaca sibirica > Caragana microphylla > Pyrus betulaefolia > Acer stenolobum > Quercus liaotungensis > Robinia pseudoacacia. The first five species also showed lower levels of osmotic potential at full turgor (Ψ satπ ) and higher symplastic osmotic solute content per dry weight, suggesting they possess advantages in osmotic adjustment. Also, this study supports previous reports noting rehydration pretreatment resulted in shifts in P–V parameters. The magnitude of the shifts varied with species and water conditions. The effect of rehydration was stronger for species with higher drought tolerance or subjected to the influence of drought. Differences in the parameters among species were mitigated as a result of rehydration. Those with a lower Ψtlp or midday water potential were more deeply affected by rehydration. Application of instantaneous measurements was strongly recommended for proper analysis of P–V curves particularly in arid and semiarid areas.
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Abbreviations
- RWC:
-
Relative water content
- RWCtlp :
-
Relative water content at turgor loss point
- SWC:
-
Relative symplastic water content
- SWCtlp :
-
Relative symplastic water content at turgor loss point
- NsDW−1 :
-
Symplast osmotic solute content per dry weight
- V0DW−1 :
-
Symplastic water at full turgor per dry weight
- V0 :
-
Relative symplastic water content
- Va :
-
Relative apoplastic water content
- Ψ:
-
Water potential
- Ψpd :
-
Water potential at predawn
- Ψmd :
-
Water potential at midday
- Ψtlp :
-
Water potential at turgor loss point
- Ψp :
-
Pressure potential
- Ψπ :
-
Osmotic potential
- Ψ satπ :
-
Osmotic potential at water saturation with full turgor
- ε:
-
Bulk elastic modulus
- εmax :
-
Maximum bulk elastic modulus
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Acknowledgments
This research has been supported by the National Natural Science Foundation of China (No. 41171419), the Knowledge Innovation Project of Chinese Academy of Sciences (kzcx2-XB2-05, kzcx2-yw-BR-02), and the Core University Exchange Program of Japan Society for the Promotion of Science.
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Communicated by J. Franklin.
M.-J. Yan and M. Yamamoto contributed equally to this work
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Yan, MJ., Yamamoto, M., Yamanaka, N. et al. A comparison of pressure–volume curves with and without rehydration pretreatment in eight woody species of the semiarid Loess Plateau. Acta Physiol Plant 35, 1051–1060 (2013). https://doi.org/10.1007/s11738-012-1143-3
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DOI: https://doi.org/10.1007/s11738-012-1143-3