Wardlaw, I.F. and Eckhardt, L. (1987) Assimilate movement in Lolium and Sorghum leaves. IV. Photosynthetic responses to reduced translocation and leaf storage. Australian Journal of Plant Physiology, 14 (5). pp. 573-591.
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Abstract
The net CO2 exchange (NCE) rates of the last fully expanded leaves of Lolium temulentum and Sorghum bicolor were examined in relation to the accumulation of photosynthate that occurred with time in continuous light (1100 µmol PAR/m²s). On a leaf area basis L. temulentum, although having a lower NCE, accumulated current photosynthate at a faster rate than S. bicolor and had a greater capacity for storage. In L. temulentum there was an initial rapid rise in the ethanol-water soluble leaf components followed by a steady increase in the accumulation of starch, while in contrast in S. bicolor there was an initial rapid rise in starch followed by a change to the accumulation of soluble photosynthate. After 4-6 h in continuous light there was a fall in NCE in both species, with the response depending on the balance between source and sink tissue. The decrease in NCE coincided with an increase in specific leaf weight (SLW) of about 40%, and SLW showed a closer negative correlation with NCE than leaf solute potential. The fall in NCE, associated with an accumulation of photosynthate, was primarily related to factors within the leaf and not to stomatal conductance. The fall in NCE could not be accounted for by a rise in photorespiration and did not appear to be associated directly with an increase in the partitioning of photosynthate into starch. In both L. temulentum and S. bicolor a fall in apparent quantum yield coincided with the fall in NCE
| Item Type: | Article |
|---|---|
| Additional Information: | We thank the staff of the Canberra phytotron for their help in the growth of the plant material and maintenance of the equipment, particularly the 'high light' cabinet. |
| Author Affiliation: | Division of Plant Industry, CSIRO, Canberra, ACT 2601, Australia |
| Subjects: | Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Sorghum |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 21 Jun 2012 09:11 |
| Last Modified: | 21 Jun 2012 09:11 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/6092 |
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