Analysis of abscission responses to photodecomposition products of 1-naphthaleneacetic acid |
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Authors: | Shindy W W; Lyon J L; Gauer W O; Crosby D G; Addicott F T |
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Institution: | Department of Environmental Toxicology and of Agronomy, University of California Davis, 95616, U.S.A. |
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Abstract: | This paper presents an analysis of abscission reponses of cottonexplants to (a) 1-naphthaneneacetic acid; (b) photodecompositionproducts of 1-naphthaleneacetic acid: 1-methylnaphthalene, 1-naphthaldehyde,1-naphthoic acid, naphthalene, and phthalic acid; and (c) arelated compound: naphthaleneacetyl aspartate. Abscission wasaccelerated by low amounts and retarded by high amounts of 1-naphthaleneaceticacid and 1-naphthoic acid. No significant effect on abscissionwas observed from 1- methylnaphthalene, 1-naphthaldehyde, orphthalic acid applied in amounts from 108 to 10.0 µgper petiole; or with naphthalene from 103 to 10.0µgper petiole. Naphthaleneacetyl aspartate had no effect at 5?104to 5?103 µg per petiole, but completely inhibitedabscission at 5 ? 101 and 5.0 µg per petiole. Thedata are analyzed on part by a previously described mechanicalmethod for the determination of abscission indexes, and in partby a new method described herein, using a digital computer forthe analysis of the abscission time-course data. The resultshave significance to the understanding of the variability encounteredin fruit thinning by 1-naphthaleneacetic acid and related substances,and are discussed in relation to the known intermediate effectsof 1-naphthaleneacetic acid in fruit thinning.
1Present address: Department of Biology, Univesity of California,Riverside, California 92502, U.S.A. (Received August 26, 1972; ) |
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