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- Title
Effect of sulphur nutrition on redistribution of sulphur in vegetative barley.
- Authors
Adiputra, I. Gede K.; Anderson, J. W.
- Abstract
Barley plants (Hordeum vulgare cv. Clipper) were grown in nutrient solution containing 25 μM sulphate and pulsed for 48 h with [35S]sulphate. The plants were then returned to unlabelled 25 μM sulphate and analysed for sulphur and 35S‐label at various times. The sulphur content of each leaf increased to a maximum as it attained full expansion and then decreased by ca 38–50% over the ensuing 30 days. Expanding leaves had the highest specific radioactivity after the pulse but this declined as the leaves expanded. The first leaf to emerge during the chase also had a high specific radioactivity. The data are consistent with the proposal that the sulphur required for early leaf development is derived from a previously formed leaf. 35S‐Labelled sulphur which was delivered to fully expanded leaves did not equilibrate with endogenous sulphur and was selectively re‐exported. In another experiment, barley plants were grown in 5 μM sulphate, pulsed for 48 h with [35S]sulphate and then grown at 0 (S0), 5 (Ss) or 25 μM (S25) unlabelled sulphate. In S25 plants, the sulphur content of both the fully expanded leaves and the expanding leaves increased indicating that the control of sulphur allocation in these plants differed from that in plants grown continuously in 25 μM sulphate and in plants which were grown at 0 or 5 μM sulphate (sub‐optimal for the growth of leaves L7 and L8). The export of 35S‐label from fully expanded leaves during the chase was not influenced by sulphur nutrition. However, the amount of 35S‐label acquired by leaves which formed during the chase increased with sulphur nutrition. In S25 plants these leaves subsequently underwent net loss of label but the analogous leaves of Sn and S5 plants did not. Collectively, the data indicate that, under sulphur limiting conditions, there is no evidence of a mechanism in barley which enhances the mobilization of sulphur from fully expanded leaves to young expanding leaves.
- Subjects
SULFUR; HORDEUM; PLANT growth-promoting rhizobacteria; NONMETALS; BARLEY; PLANT nutrients
- Publication
Physiologia Plantarum, 1995, Vol 95, Issue 4, p643
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1995.tb05534.x