Fructose 2,6-bisphosphate-modulated photosynthesis in sorghum leaves grown under low water regimes
1996
Ramachandra Reddy, A.
The influence of low water potentials on photosynthetic sucrose formation, fructose 2,6-bisphosphate (F2,6BP) content, partitioning of photosynthate and related enzymes was investigated in control and water-stressed leaves of Sorghum bicolor cv. CSH 5. The accumulation of F2,6BP in water-stressed plants reduced sucrose formation in the leaves. The activities of fructose 1,6-bisphosphatase and sucrose phosphate synthase were reduced in water-stressed plants. The distribution of 14C into starch increased with increasing stress, while the incorporation into sucrose was drastically reduced in the stressed plants. The activity of fructose 6-phosphate 2-kinase was very high in stressed plants, while the levels of fructose 2,6-bisphosphatase were low. The results suggest that low water potentials result in F2,6BP accumulation, which modulates sucrose synthesis and carbon-partitioning in sorghum leaves.
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