Articles
ROLE OF ETHYLENE IN NAPHTHALENE-MEDIATED SPROUT GROWTH INHIBITION IN POTATO
Article number
619_45
Pages
383 – 388
Language
English
Abstract
A number of substituted naphthalenes reversibly inhibit potato (Solanum tuberosum L.) sprout growth and may have potential as commercial sprout inhibitors.
Sprout growth is also reversibly inhibited by ethylene treatment and ethylene production is often stimulated by xenobiotics.
The role of endogenous ethylene in naphthalene-mediated sprout growth inhibition was examined using a variety of ethylene biosynthesis and action inhibitors.
Ethylene evolution from intact potato tubers was significantly stimulated following treatment with alpha-naphthalene acetic acid (NAA), but not by 1,4- or 1,6-dimethylnaphthalene treatment.
An increase in ethylene production was observed 24 h after NAA treatment, reached a maximum 48-72 h post-treatment and declined gradually thereafter.
In addition to NAA, a variety of structurally unrelated auxins also stimulated ethylene production and inhibited sprout growth.
Neither the non-competitive (Ag thiosulfate) nor the competitive (2,5-norbornadiene) ethylene antagonists affected NAA-induced growth inhibition.
Simultaneous treatment with the ethylene biosynthesis inhibitor AVG blocked NAA-induced ethylene production but did not affect subsequent sprout growth inhibition.
These results suggest that the sprout inhibiting effects of NAA, but not those of 1,4 or 1,6-dimethyl-naphthalene, are related to intrinsic auxin-like bioactivity and are not dependent on endogenous ethylene synthesis or action.
Sprout growth is also reversibly inhibited by ethylene treatment and ethylene production is often stimulated by xenobiotics.
The role of endogenous ethylene in naphthalene-mediated sprout growth inhibition was examined using a variety of ethylene biosynthesis and action inhibitors.
Ethylene evolution from intact potato tubers was significantly stimulated following treatment with alpha-naphthalene acetic acid (NAA), but not by 1,4- or 1,6-dimethylnaphthalene treatment.
An increase in ethylene production was observed 24 h after NAA treatment, reached a maximum 48-72 h post-treatment and declined gradually thereafter.
In addition to NAA, a variety of structurally unrelated auxins also stimulated ethylene production and inhibited sprout growth.
Neither the non-competitive (Ag thiosulfate) nor the competitive (2,5-norbornadiene) ethylene antagonists affected NAA-induced growth inhibition.
Simultaneous treatment with the ethylene biosynthesis inhibitor AVG blocked NAA-induced ethylene production but did not affect subsequent sprout growth inhibition.
These results suggest that the sprout inhibiting effects of NAA, but not those of 1,4 or 1,6-dimethyl-naphthalene, are related to intrinsic auxin-like bioactivity and are not dependent on endogenous ethylene synthesis or action.
Authors
J.C. Suttle
Keywords
Buds, Dormancy, Eyes, Postharvest Storage, Solanum tuberosum L., Tubers
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