Abstract
Background and aims
Extensive worldwide dryland degradation calls for identification of functional traits critical to dryland plant performance and restoration outcomes. Most trait examination has focused on drought tolerance, although most dryland systems are water and nutrient co-limited. We studied how drought impacts both plant water relations and nitrogen (N) nutrition.
Methods
We grew a suite of grasses common to the Intermountain West under both well-watered and drought conditions in the greenhouse. These grasses represented three congener pairs (Agropyron, Elymus, Festuca) differing in their habitat of origin (“wetter” or “drier”). We measured growth, water relations, N resorption efficiency and proficiency and photosynthetic N use efficiency in response to drought.
Results
Drought decreased growth and physiological function in the suite of grasses studied, including a negative impact on plant N resorption efficiency and proficiency. This effect on resorption increased over the course of the growing season. Evolutionary history constrained species responses to treatment, with genera varying in the magnitude of their response to drought conditions. Surprisingly, habitat of origin influenced few trait responses.
Conclusions
Drought impacted plant N conservation, although these responses also were constrained by evolutionary history. Future plant development programs should consider drought tolerance not only from the perspective of water relations but also plant mineral nutrition, taking into account the role of phylogeny.
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Abbreviations
- Neff, %:
-
Nitrogen resorption efficiency
- Nprof, g kg−1 :
-
Nitrogen resorption proficiency
- A, μmol CO2 m−2 s−1 :
-
Photosynthetic assimilation
- PNUE, μmol CO2 mol N−1 s−1 :
-
Photosynthetic nitrogen use efficiency
- gs, mmol m−2 s−1 :
-
Stomatal conductance
- Ψw, MPa:
-
Water potential
- WUE, μmol CO2 mol−1 H2O:
-
Water use efficiency
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Acknowledgments
We thank J. R. Johansen, C. A. Sheil, and two anonymous reviewers for helpful comments regarding the manuscript and T. Jones for help with species selection and access to plant material. For additional laboratory and greenhouse assistance, we thank S. Harrington, M. Julian, J. Walker, N. Pietrasiak, and M. Thornhill. The John Carroll University Office of Graduate Studies and the Biology Department helped to support this work.
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Khasanova, A., James, J.J. & Drenovsky, R.E. Impacts of drought on plant water relations and nitrogen nutrition in dryland perennial grasses. Plant Soil 372, 541–552 (2013). https://doi.org/10.1007/s11104-013-1747-4
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DOI: https://doi.org/10.1007/s11104-013-1747-4