Jones, M.M. and Osmond, C.B. and Turner, N.C. (1980) Accumulation of solutes in leaves of sorghum and sunflower in response to water deficits. Australian Journal of Plant Physiology, 7 (2). pp. 193-205.
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Abstract
The influence of water deficits on the conc. of major solutes in fully expanded sorghum leaves and fully expanded and partly expanded sunflower leaves was studied in order to assess their contribution to osmotic adjustment. The decreased osmotic potential at full turgor in fully expanded sorghum leaves at a moderate level of stress (predawn lear water potential of -0.85 MPa) was fully accounted for by increases in sugars, K and Cl. The contributions of total inorganic ions and sugars (glucose and sucrose) were approx. equal. In fully expanded sunflower leaves stressed to a predawn leaf water potential of -1.4 MPa, only 50% of the decrease in leaf osmotic potential was accounted for by changes in the conc. of solutes studied: increases in the conc. of K, Mg, Ca and NO3, together with free amino acids were approx. equal to the decrease in leaf osmotic potential at full turgor, but the contributions of these solutes were offset by a decrease in the conc. of total carboxylic acids. Sugars did not contribute to the decrease in leaf osmotic potential at full turgor in fully expanded sunflower leaves. The major solutes responsible for the changes in leaf osmotic potential at full turgor in partly expanded sunflower leaves exposed to severe stress treatment (predawn leaf water potential of -2.3 MPa) were the inorganic anions, Cl and NO3, and to a lesser extent carboxylic acids (principally aconitate). Free amino acids made a significant contribution (18%) to the decrease in leaf osmotic potential at full turgor, but there was a decrease in the level of soluble sugars
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Environmental Biology, Research School of Biological Sciences, Australian National University, Canberra, A.C.T. Australia 2601 |
| Subjects: | Plant Production Plant Protection Environmental Science |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 08 Oct 2012 07:30 |
| Last Modified: | 08 Oct 2012 07:30 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8317 |
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