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Influence of rate of development of leaf water deficits upon photosynthesis leaf conductance water use efficiency and osmotic potential in sorghum



Influence of rate of development of leaf water deficits upon photosynthesis leaf conductance water use efficiency and osmotic potential in sorghum



Physiologia Plantarum 45(1): 103-111



This study reports the effect of rate of development of leaf water deficits in soil-grown sorghum (Sorghum bicolor) on the relationship of net photosynthesis, leaf conductance and water use efficiency to leaf water potential and on the degree of solute accumulation (osmotic adjustment). Recovery of these processes on rewatering, and responses during a 2nd stress cycle were also studied. The most rapid rate of stress (1.2 MPa [pascals] day-1) resulted in no solute accumulation and the lowest rate of net photosynthesis and leaf conductance for any given leaf water potential during stress. Stress at 0.7 and 0.15 MPa day-1 led to equal solute accumulations of approximately 0.6 MPa, but net photosynthesis, leaf conductance and water use efficiency at a given leaf water potential were lower with the faster rate of stress (0.7 MPa day-1). Additionally, leaf conductance at a given leaf turgor potential was lowest at the 1.2 MPa day-1 stress rate, slightly higher at the intermediate rate of stress and clearly highest at the slowest rate of stress. Recovery of net photosynthesis and leaf conductance upon rewatering was rapid, taking less than 3 days, but full recovery of osmotic potential took between 6 and 11 days. One slow stress cycle had no influence on relationships during a 2nd cycle. The concept of a threshold leaf water potential for stomatal closure is discussed. Apparently stomatal closure occurs slowly over a wide range of leaf water potential (> 1.0 MPa), the range being greater for slower rates of stress.

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Accession: 005690758

Download citation: RISBibTeXText

DOI: 10.1111/j.1399-3054.1979.tb01672.x



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