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Mechanical perturbation-induced ethylene releases apical dominance in Pharbitis nil by restricting shoot growthMechanical perturbation (MP, rubbing) or internodes of Pharbitis nil shoots initiates release of lateral buds (LB) from apical dominance within 48 h. Evidence is presented which suggests that MP promotion of LB outgrowth is mediated by ethylene-induced restriction of main shoot growth. Ethylene production in the internodes is stimulated by MP within 2 h. Effects of MP are mimicked by treatments with 1-aminocyclopropane-1-carboxylic acid (ACC) and are negated by the inhibitors of ethylene production or action, aminoethoxy vinylglycine (AVG) and AgNO3. The fact that effects of MP, ACC, and ethylene inhibitors are observed to occur on main shoot growth at least 24 h before they are observed to occur on LB growth suggests a possible cause and effect relationship. MP also causes an increase in internode diameter. MP stimulation of ethylene production appears to be mediated by ACC synthase. The results of this study and our previous studies suggest that apical dominance may be released by any mechanism which induces ethylene restriction of main shoot growth.
Document ID
20040120774
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Prasad, T. K.
(Ohio State University Columbus 43210, United States)
Cline, M. G.
Date Acquired
August 22, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Plant science (Shannon, Ireland)
Volume: 41
ISSN: 0168-9452
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-625
Distribution Limits
Public
Copyright
Other

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