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Plant and Cell Physiology, 1982, Vol. 23, No. 8 1467-1470
© 1982

Short communication

Further Evidence for Inactivation of Fructose-1,6-bisphosphatase at the Beginning of SO2 Fumigation. Increase in Fructose-1,6-bisphosphate and Decrease in Fructose-6-phosphate in SO2-Fumigated Spinach Leaves

Kiyoshi Tanaka1, Hiromi Mitsuhashi2, Noriaki Kondo1 and Kiyoshi Sugahara1

1Division of Environmental Biology, National Institute for Environmental Studies Yatabe, Ibaraki 305, Japan
2Department of Environmental Chemistry, Faculty of Science, Toho University Funahashi, Chiba 274, Japan

The substrate level of the photosynthetic reductive pentose phosphate cycle in spinach leaves during SO2 fumigation was surveyed. At the beginning of SO2 fumigation, fructose-1,6-bisphosphate increased and fructose-6-phosphate decreased, while ribulose-1,5-bisphosphate remained unchanged and 3-phosphoglyceric acid rapidly decreased. These results suggested that the inhibition of photosynthesis in spinach leaves with SO2 might be due to inactivation of fructose-1,6-bisphosphatase.

(Received May 26, 1982; Accepted September 27, 1982)
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