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EFFECTS OF ESTER CHAIN LENGTHS ON THE GROWTH REGULATING ACTIVITY OF 2,3‐DICHLOROBENZOATES
Author(s) -
Steffens G. L.,
Buta J. G.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09909.x
Subject(s) - elongation , hydrolysis , biology , penetration (warfare) , alkyl , biochemistry , chemistry , organic chemistry , materials science , ultimate tensile strength , metallurgy , operations research , engineering
The activities of the n‐C 1 through n‐C 10 esters of 2,3‐dichlorobenzoic acid (DCBA) were tested as inhibitors of terminal growth of Xanthi‐nc tobacco plants. The C 2 and C 3 esters were the most active as emulsions at 2.5 × 10 –2 m . They retarded growth of the entire bud for 10 days and longer upon repeated applications. Treatment of plants with 2,3‐DCBA or its potassium salt at dosages up to 5 × 10 –2 m caused only slight growth regulating effects. In a dosage‐response study, it was clearly shown that the C 3 ester inhibited stem elongation but the C 8 ester did not. The striking differences in plant growth due to treatment with 2,3‐DCBA esters of different alkyl chain lengths are discussed in terms of penetration, ester hydrolysis, and growth factor interactions.