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Plant Physiology 43:1430-1434 (1968)
© 1968 American Society of Plant Biologists

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Invertase Inhibitors From Red Beet, Sugar Beet, and Sweet Potato Roots

Russell Pressey

Red River Valley Potato Processing Laboratory 1, East Grand Forks, Minnesota 56721

Invertase inhibitors have been isolated and partially purified from red beets, sugar beets, and sweet potatoes. These inhibitors are thermolabile proteins with molecular weights of 18,000 to 23,000. They do not inhibit yeast and Neurospora invertases, but they are reactive with potato tuber invertase and other plant invertases with pH optima near 4.5. There are differences in reactivity of the inhibitors with some of the plant invertases, however. For most invertases, red beet and sugar beet inhibitors are most effective at pH 4.5 while sweet potato inhibitor is most effective at pH 5.

1 A laboratory cooperatively operated by the Eastern Utilization Research and Development Division, Agricultural Research Service, United States Department of Agriculture; Minnesota Agricultural Experiment Station; North Dakota Agricultural Experiment Station; and the Red River Valley Potato Growers' Association.




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In wounded sugar beet (Beta vulgaris L.) tap-root, hexose accumulation correlates with the induction of a vacuolar invertase isoform
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Copyright © 1968 by the American Society of Plant Biologists