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Responses of Dobera glabra and Eight Co-Occurring Species to Drought and Salinity Stress at a Savanna-Scrub Ecotone: Implications in the Face of Climate Change

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DOI: 10.4236/ojf.2014.44039    2,880 Downloads   3,798 Views   Citations


To quantify the resistance of different co-occurring species to drought and osmotic stress (salinity stress), plant water (Ψ) and osmotic (Ψp) potentials were measured during the dry season. We applied a pressure chamber and cryoscopy to measure Ψ and Ψp, respectively. The species revealed a wide range of responses to water stress (-0.83 to -5.8 MPa) and osmotic stress (-1.3 to -3.2 MPa) and not all plants fit closely into one or the other category. Evergreen species tended to have lower Ψ than deciduous species. Notably, Dobera glabra, well known as drought indicator tree in the region, showed the lowest Ψ (up to -5.8 MPa) and Ψp (-3.2 MPa). This indicates its outstanding drought and osmotic stress tolerance and explains its ability to thrive in drought prone areas and years. The recent expansion of A. oerfota and A. mellifera in the study area could be related to their tolerance of osmotic stress, which may imply a trend of soil salinization. The division of plant responses into categories or strategies can be valuable aid to understanding long-term plant survival and distribution, monitor site condition and predict the direction of future changes.

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The authors declare no conflicts of interest.

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Gebrekirstos, A. , Teketay, D. and Mitlöhner, R. (2014) Responses of Dobera glabra and Eight Co-Occurring Species to Drought and Salinity Stress at a Savanna-Scrub Ecotone: Implications in the Face of Climate Change. Open Journal of Forestry, 4, 327-337. doi: 10.4236/ojf.2014.44039.


[1] Abrams, M. D. (1988). Sources of Variation in Osmotic Potentials with Special Reference to North American Tree Species. Forest Science, 34, 1030-1046.
[2] Abrol, I. P., Yadav, J. S. P., & Massoud, F. I. (1988). Salt-Affected Soils and Their Management. FAO Soils Bulletin 39, Rome: FAO.
[3] Abule, E. (2002). Rangeland Evaluation in the Middle Awash Valley of Ethiopia. PhD Thesis, Bloemfontein: University of Orange Free State.
[4] Apse, M. P., & Blumwald, E. (2002). Engineering Salt Tolerance in Plants. Current Opinion in Biotechnology, 13, 146-150.
[5] Ashraf, M. (2004). Some Important Physiological Selection Criteria for Salt Tolerance in Plants. Flora, 199, 361-376.
[6] Boyer, J. S. (1995). Measuring the Water Status of Plants and Soils. San Diego, CA: Academic Press.
[7] Breckle, S. W. (2002). Salinity, Halophytes and Salt Affected Natural Ecosystems. In A. Laüchly, & U. Lüttge (Eds.), Salinity: Environments-Plants-Molecules (pp. 53-77). Dordrecht: Kluwer Publishers.
[8] Bush, D. E., & Smith, S. D. (1993). Effects of Fire on Water and Salinity Relations of Riparian Woody Taxa. Oecologia, 94, 186-194.
[9] Fowler, J., Cohen, L., & Jarvis, P. (1998). Practical Statistics for Field Biology (2nd ed.). Hoboken, NJ: John Wiley and Sons.
[10] Gebre, G. M., Tschaplinski, T. J., & Shirshac, T. (1997). Water Relations of Several Hardwood Species in Response to Throughfall Manipulation in an Upland Oak Forest during a Wet Year. Tree Physiology, 18, 299-305.
[11] Gebrekirstos, A. (2005). Stable Carbon Isotopes and Plant Water Relations in the Acacia Savanna Woodlands of Ethiopia: Implications for Reforestation and Paleoclimatic Reconstructions. PhD Thesis, Goettingen: Goettingen University.
[12] Gebrekirstos, A., Teketay, D., Fetene, M., & Mitloehner, R. (2006). Adaptation of Five Co-Occurring Tree and Shrub Species to Water Stress and Its Implication in Restoration of Degraded Lands. Forest Ecology and Management, 229, 259-267.
[13] Gebrekirstos, A., Teketay, D., Mitlohner, R., & Worbes, M. (2008). Climate-Growth Relationships of the Dominant Tree Species from Semi-Arid Savanna Woodland in Ethiopia. Trees, 22, 631-641.
[14] Gebrekirstos, A., van Noordwijk, M., Neufeldt, H., & Mitlohner, R. (2011). Relationships of Stable Carbon Isotopes, Plant Water Potential and Growth: An Approach to Asses Water Use and Growth Strategies of Dry Land Agroforestry Species. Trees, 25, 95-102.
[15] Gebrehiwot, K. (2003). Ecology and Management of Boswellia Papyrifera (Del.) Hochst. in Dry Forests in Tigray, Northern Ethiopia. Ph.D. Thesis, Goettingen: Gottingen University.
[16] Gebrehiwot, K., Muys, B., Haile, M., & Mitlohner, R. (2005). The Use of Plant Water Relations to Characterize Tree Species and Sites in the Drylands of Northern Ethiopia. Journal of Arid Environments, 60, 581-592.
[17] Gorham, J. (1995). Mechanism of Salt Tolerance of Halophytes. In R. Choukr-Allah, C. V. Malcolm, & A. Hamdy (Eds.), Halophytes and Biosaline Agriculture (pp. 207-223). New York: Marcel Dekker.
[18] Greenway, H., & Munns, R. (1980). Mechanisms of Salt Tolerance in Nonhalophytes. Annual Review of Plant Physiology, 13, 143-160.
[19] Gunn, R. H., & Richardson, D. P. (1979). The Nature and Possible Origins of Soluble Salts in Deeply Weathered Landscapes of Eastern Australia. Australian Journal of Soil Research, 17, 197-215.
[20] Guinand, Y., & Lemessa, D. (2000). Wild Food Plants in Southern Ethiopia: Reflections on the Role of “Famine Foods” at a Time of Drought. Addis Ababa: UN-EUE.
[21] Hinckley, T. M., Lassoie, J. P., & Running, S.W. (1978). Temporal and Spatial Variations in the Water Status of Forest Trees. Forest Science Monograph, 20, 1-72.
[22] Kramer, P. J., & Boyer, J. S. (1995). Water Relations of Plants and Soils. New York: Academic Press.
[23] Kreeb, K. H. (1990). Methoden Zur Pflanzenokolgie und Bioindikation. Stuttgart: Jena Fischer.
[24] Kreeb, K. H., Whalley, R. D., & Charley, J. L. (1995). Some Investigations into Soil and Vegetation Relationships Associated with Alkaline-Saline Soil Surface in the Walcha Area, Northern Tablelands, New South Wales. Australian Journal of Agricultural Research, 46, 209-224.
[25] Ladiges, P. Y. (1975). Some Aspects of Tissue Water Relations in Three Populations of Eucalyptus viminalis Labill. New Phytologist, 75, 53-62.
[26] Mitlohner, R. (1998). Pflanzeninterne Potentiale als Indikatoren für den tropischen Standort. Aachen: Shaker Verlag.
[27] Mitlohner, R., & Koepp, R. (2007). Bioindicator Capacity of Trees towards Dryland Salinity. Trees, 21, 411-419.
[28] Morgan, J. M. (1984). Osmoregulation and Water Stress in Higher Plants. Annual Review of Plant Physiology, 35, 299-319.
[29] Munns, R. (2002). Comparative Physiology of Salt and Water Stress. Plant, Cell & Environment, 25, 239-250.
[30] Richter, H. (1997). Water Relations of Plants in the Field: Some Comments on the Measurement of Selected Parameters. Journal of Experimental Botany, 48, 1-7.
[31] Ritchie, G. A., & Hinckley, T. M. (1975). The Pressure Chamber as an Instrument for Ecological Research. Advances in Ecological Research, 9, 165-254.
[32] Shannon, M. C. (1998). Adaptation of Plants to Salinity. Advances in Agronomy, 60, 75-120.
[33] Sperry, J. S., & Hacke, U.G. (2002). Desert Shrub Water Relations with Respect to Soil Characteristics and Plant Functional Type. Functional Ecology, 16, 367-378.
[34] Scholander, P. F., Hammel, H. T., Bradstreet, E. D., & Hemmingsen, E. A. (1965). Sap Pressure in Vascular Plants. Science, 148, 339-346.
[35] Sellin, A. (1996). Base Water Potential in Shoots of Picea abies as a Characteristics of the Soil Water Status. Plant and Soil, 184, 273-280.
[36] Sellin, A. (1998). The Dependence of Water Potential in Shoots of Picea abies on Air and Soil Water Status. Annales Geophysicae, 16, 470-476.
[37] Serrano, R., Mulet, J. M., Rios, G., Marquez, J. A., de Larrinoa, I. F., Leube, M. P., Mendizabal, I., Pascual-Ahuir, A., Proft, M., Ros, R., & Montesinos, C. (1998). A Glimpse of the Mechanism of Ion Homeostasis during Salt Stress. Journal of Experimental Botany, 50, 1023-1036.
[38] Shiferaw, H., Teketay, D., Nemomissa, S., & Assefa, F. (2004). Some Biological Characteristics That Foster the Invasion of Prosopis juliflora (Sw.) DC. at Middle Awash Rift Valley Area, North-Eastern Ethiopia. Journal of Arid Environments, 58, 134-153.
[39] Slatyer, R. O. (1967). Plant Water Relationships. London: Academic Press.
[40] Sobrado, M. A. (1986). Aspects of Tissue Water Relations and Seasonal Changes of Leaf Water Potential Components of Evergreen and Deciduous Species Coexisting in Tropical Dry Forest. Oecologia, 68, 413-416.
[41] Teketay, D., Senbeta, F., Maclachlan, M., Bekele, M., & Barklund, P. (2010). Edible Wild Plants in Ethiopia. Addis Ababa: Addis Ababa University Press.
[42] Tsegaye, D., Haile, M., & Moe, S. R. (2010). The Effect of Land Use on the Recruitment and Population Structure of the Important Food and Fodder Plant, Dobera glabra (Forssk.) Poir., in Northern Afar, Ethiopia. Journal of Arid Environments, 74, 1074-1082.
[43] Tsegaye, D., Balehgn, M., Gebrehiwot, K., Haile. M., Gebresamuel, G., & Aynekulu, E. (2007). The Role of Garsa (Dobera glabra) for Household Food Security at Times of Food Shortage in Aba’ala Wereda, North Afar: Ecological Adaptation and Socio-Economic Value: A Study from Ethiopia. Oslo: Dryland Coordination Group.
[44] Tyree, M. T., & Hammel, H. T. (1972). The Measurement of the Turgor Pressure and the Water Relations of Plants by the Pressure-Bomb Technique. Journal of Experimental Botany, 23, 267-282.
[45] Vertovec, M., Sakcali, S., Ozturk, M., Salleo, S., Giacomich, P., Feoli, E., & Nardini, A. (2001). Diagnosing Plant Water Status as a Tool for Quantifying Water Stress on a Regional Basis in Mediterranean Drylands. Annuals of Forest Science, 58, 113-125.
[46] Wang, W., Vinocur, B., & Altman, A. (2003). Plant Responses to Drought, Salinity and Extreme Temperatures: Towards Genetic Engineering for Stress Tolerance. Planta, 218, 1-14.
[47] Wright, H. A., & Bailey, A.W. (1982). Fire Ecology: United States and Southern Canada. New York: John Wiley and Sons, Inc.
[48] Zar, J. (1999). Biostatistical Analysis (4th ed.). Upper Saddle River, NJ: Prentice Hall.

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