Jones, M.M. and Rawson, H.M. (1979) 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). pp. 103-111.
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Abstract
Effects 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) were studied. Recovery of these processes on rewatering, and responses during a 2nd stress cycle were also studied. The most rapid rate of stress (leaf water potential of 1.2 MPa/day) 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 abd 0.15 MPa/day 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). Additionally, leaf conductance at a given leaf turgor potential was lowest at the 1.2 MPa/day stress rate, slightly higher at the intermediate rate of stress, and clearly highest at the slowest rate of stress. Recovery of both net photosynthesis and leaf conductance upon rewatering was rapid, taking < 3 days, but full recovery of osmotic potential took 6-11 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 and the conclusion reached that stomatal closure occurs slowly over a wide range of leaf water potential (>1.0 MPa), the range being greater for slower rates of stress
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Environmental Biology, Research School of Biological Sciences, Australian National University, Canberra City, A.C.T., Australia 2601 |
| Subjects: | Crop Improvement |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 08 Oct 2012 07:39 |
| Last Modified: | 08 Oct 2012 07:39 |
| Official URL: | http://dx.doi.org/10.1111/j.1399-3054.1979.tb01672... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8318 |
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