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PHOTOSYNTHESIS AND FRUCTOSE 2,6-BISPHOSPHATE CONTENT IN WATER STRESSED WHEAT LEAVES

A. RAMACHANDRA REDDY
Cereal Research Communications
Vol. 28, No. 1/2 (2000), pp. 131-137
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/23786054
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
PHOTOSYNTHESIS AND FRUCTOSE 2,6-BISPHOSPHATE CONTENT IN WATER STRESSED WHEAT LEAVES
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Abstract

Net photosynthetic rates, sucrose levels, fructose 2,6-biphosphate content and the related enzyme activities were investigated in control and water stressed leaves of Triticum aestivum L. var sonalica. Fructose 2,6-bisphosphate accumulated in water stressed plants and reduced leaf photosynthesis, sucrose content and the activities of fructose 1,6-bisphosphatase and sucrose phosphate synthase. 14C-distribution into starch was more with increasing water stress while 14C-incorporation into sucrose was drastically reduced in stressed plants. Fructose-6-phosphate-2-kinase activity was extremely high in stressed plants while the activity of fructose 2,6-bisphosphatase was low. The results provide a clear evidence that low leaf water potentials result in fructose-2,6-bisphosphate accumulation, which modulates photosynthetic sucrose formation and carbon partitioning in wheat leaves.

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