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Plant and Cell Physiology, 1965, Vol. 6, No. 4 601-608
© 1965

Article

REGULATION OF BUD REST IN TUBERS OF POTATO SOLANUM TUBEROSUM L.: II. INHIBITION OF SPROUTING BY INHIBITOR ß COMPLEX AND REVERSAL BY GIBBERELLIN A31

SHULAMITH BLUMENTHAL-GOLDSCHMIDT2 and LAWRENCE RAPPAPORT

Department of Vegetable Crops, University of California Davis, California 95616, U.S.A.

Two acid ether extracts of inhibitor ß complex were prepared from resting ‘Red Pontiac’ potato tuber peelings, and buds. The inhibiting zone was separated chromatographically and tested on wheat coleptiles, dwarf peas, and potato "eyes." Dwarf peas did not respond. ß showed marked inhibition of wheat coleoptile elongation and of sprouting of potato eyes. Ability to inhibit sprouting was a function of repeated application. This inhibition was reversed by GA3. When the inhibiting eluates of the chromatographed first extraction were stored for 6 months at –10°, they completely lost ability to inhibit both coleoptiles and potato buds. Storage of the corresponding eluates of the second extract at 4° for 48 days resulted in partial loss of activity in the coleoptile test and complete loss in the potato eye test. The results tend to support the concept that a balance of inhibitors and stimulators participates in controlling rest, but do not support conclusively the implication of ß in rest.

1This study was generously supported in part by United States Public Health Service Grant EF-61

2Present address: Department of Botany, Hebrew University, Jerusalem, Israel

(Received April 26, 1965; )
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