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Plant and Cell Physiology, 1963, Vol. 4, No. 4 323-334
© 1963

Article

STUDIES ON THE PRODUCTION AND PHYSIOLOGICAL EFFECTS OF ASYMMETRIN

GERALD E. ZAROOGIAN1,2 and ROY W. CURTIS

Department of Botany and Plant Pathology, Purdue University Lafayette, Indiana, U.S.A.

In shake-flask culture asymmetrin was produced by PenicIllium thomiiaud Byssochlamys niveaduring autolysis. A bioassay was devised to estimate relative concentrations of this compound. Culture filtrates of P. thomiicontaining asymmetrin caused a decrease in wet weight, dry weight, and total nitrogen of Phaseolus vulgarisup to 18 days after treatment. At certain intervals after treatment with culture filtrate of B. nivea,respiration was inhibited, and changes were observed in isotope ratio values of plants supplied with glucose-14 C. Plants treated previously with culture filtrates of B. nivearesponded but little to gibberelhc acid. High concentrations of mdoleacetic acid inhibited growth of control plants but stimulated growth of plants treated with culture filtrate of B. nivea.

1Present address: United Fruit Company, Norwood, Massachusetts. Supported in part by a Public Health Service Fellowship No. GF 13,776 from the division of General Medical Sciences, Public Health Service, National Institutes of Health, and Grant G 20989 from the National Science Foundation.

2Journal Paper No. 2170 of the Purdue Agricultural Experiment Station.

(Received August 6, 1963; )
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