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Absorption and Penetration of Picloram in Potato Tuber Discs

Published online by Cambridge University Press:  12 June 2017

C. R. Swanson  and
J. R. Baur
C. R. Swanson
Affiliation:
Crops Research Division, Agr. Res. Ser., U. S. Dep. of Agr.
J. R. Baur
Affiliation:
Crops Research Division, Agr. Res. Ser., U. S. Dep. of Agr.
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Abstract

Discs of potato (Solanum tuberosum L.) tuber tissue were immersed in buffered (pH 4.0 to 8.0) solutions of 4-amino-3,5,6-trichloropicolinic acid (picloram) (5 × 10−4M to 5 × 10−3M) for 1 to 36 hr. Uptake of picloram during incubation, and leakage after return of the discs to untreated buffer, were determined by gas chromatographic analysis of extracts of the tissue and ambient buffer. Picloram absorption increased with concentration and with time up to 24 hr. Maximum uptake occurred at pH 4.0 and very little picloram was absorbed at pH 7.0 and 8.0. Both absorption and leakage were temperature dependent. The rate and extent of leakage was greatest at the highest concentration. Typically, more than 90% of the picloram absorbed from 5 × 10−3M was lost to fresh buffer within 12 hr.

Type
Research Article
Information
Weed Science , Volume 17 , Issue 3 , July 1969 , pp. 311 - 314
Copyright
Copyright © 1969 Weed Science Society of America 

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References

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