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Plant and Cell Physiology, 1973, Vol. 14, No. 1 169-176
© 1973

Article

Analysis of abscission responses to photodecomposition products of 1-naphthaleneacetic acid

W. W. Shindy, J. L. Lyon1, W. O. Gauer, D. G. Crosby and F. T. Addicott

Department of Environmental Toxicology and of Agronomy, University of California Davis, 95616, U.S.A.

This paper presents an analysis of abscission reponses of cotton explants to (a) 1-naphthaneneacetic acid; (b) photodecomposition products of 1-naphthaleneacetic acid: 1-methylnaphthalene, 1-naphthaldehyde, 1-naphthoic acid, naphthalene, and phthalic acid; and (c) a related compound: naphthaleneacetyl aspartate. Abscission was accelerated by low amounts and retarded by high amounts of 1-naphthaleneacetic acid and 1-naphthoic acid. No significant effect on abscission was observed from 1- methylnaphthalene, 1-naphthaldehyde, or phthalic acid applied in amounts from 10–8 to 10.0 µg per petiole; or with naphthalene from 10–3 to 10.0µg per petiole. Naphthaleneacetyl aspartate had no effect at 5×104 to 5×10–3 µg per petiole, but completely inhibited abscission at 5 × 10–1 and 5.0 µg per petiole. The data are analyzed on part by a previously described mechanical method for the determination of abscission indexes, and in part by a new method described herein, using a digital computer for the analysis of the abscission time-course data. The results have significance to the understanding of the variability encountered in fruit thinning by 1-naphthaleneacetic acid and related substances, and are discussed in relation to the known intermediate effects of 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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