Regulation of Potato Tuber Protein Accumulation by Gibberellic Acid

Many studies have shown that gibberellic acid (GA3) inhibits tuberization in potato (Solanum tuberosum L.). In this study, we have utilized the 40 kilodalton glycoprotein, patatin, as a marker for biochemical events associated with the process of tuberization. To determine the effects of exogenous a...

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Published inPlant physiology (Bethesda) Vol. 78; no. 4; pp. 700 - 703
Main Authors Hannapel, David J., J. Creighton Miller, Jr, Park, William D.
Format Journal Article
LanguageEnglish
Published Rockville, MD American Society of Plant Physiologists 01.08.1985
Subjects
Agronomy. Soil science and plant productions
Biological and medical sciences
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Growth and development
Hormones
Metabolism
Metabolism. Physicochemical requirements
Morphogenesis, differentiation, rhizogenesis, tuberization. Senescence
Petioles
Photoperiod
Physiological regulation
Plant cuttings
Plant physiology and development
Plants
Sprouts
Starches
Stolons
Tubers
Proteins
Vegetable crop
Gibberellins
Solanum tuberosum
Dicotyledones
Angiospermae
Plant growth substance
Spermatophyta
Solanaceae
Tuberization
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Summary:Many studies have shown that gibberellic acid (GA3) inhibits tuberization in potato (Solanum tuberosum L.). In this study, we have utilized the 40 kilodalton glycoprotein, patatin, as a marker for biochemical events associated with the process of tuberization. To determine the effects of exogenous applications of GA3 on the induction of the accumulation of this major tuber protein, we measured patatin levels in tubers from treated whole plants, petioles from a single-node cutting system with GA3 applied in lanolin paste, and stolon tips cultured in vitro on an inductive medium supplemented with GA3. In all three systems, GA3 inhibited the accumulation of patatin and the major 15 and 22 kilodalton tuber proteins. This effect appeared to be selective since most of the other proteins were not affected and, in tubers, at least one protein was stimulated by GA3. These results suggest that GA3 can reverse biochemical events of tuberization in tubers as well as prevent the accumulation of the major tuber proteins in other inducible tissues.
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ISSN:0032-0889
1532-2548
DOI:10.1104/pp.78.4.700