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Articles

Effect of Heat Shock on Plant Growth and on Lipid and -Glucan Syntheses ¹

^a The Negev Institute for Arid Zone Research, Beer-Sheva, Israel

Primary leaves of 8-day-old Phaseolus vulgaris plants dipped in water at 46.5 to 47.5 C for 2 minutes were found to have decreased synthesis of lipid and -glucan compared to controls; UDP-glucose was used as substrate by cell-free preparations. As time elapsed, leaf growth, which was inhibited within the first 12 hours recovered in a subsequent 24-hour period. Synthesis of alkali-insoluble glucan by cell-free preparations was stimulated both in absolute and relative terms in the treated leaves at the later time period.

¹ This investigation was supported in part by a research grant to L. O. from the National Council for Research and Development (Israel) and in part by a Senior Fulbright-Hays Program grant to C. M.