Uptake and Differential Distribution of C14-Labeled Simazine in Red and White Pine Seedlings

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Abstract:

A wide difference in the tolerance of red pine (Pinus resinosa Ait.) and white pine (P. strobus L.) seedlings to simazine has been observed. Carbon14-labeled simazine was used to measure the possibility of differential absorption and distribution of this herbicide. Seedlings were raised on mycorrhizae-free Prairie soil and inoculated Prairie soil. Forty days after treatment with labeled simazine, total uptake of simazine as estimated by counting C14 assimilation was approximately equal for both pines. In red pine the C14 was fairly evenly distributed throughout the plant, but in white pine a much higher percentage was retained in the non-photosynthetic organs. The needles of red pine contained approximately 3 times more radioactive material (computed on percentage of total uptake) than white pine. The ratio of distribution of C14 from top to roots of red pine was 1 to 1.4; in white pine it was 1 to 8.4. Although mycorrhizae had developed only into the initial stages, autoradiograms and count data showed a much heavier concentration of C14 in the noninoculated white pines. Counts in noninoculated plants were more than double those of inoculated plants, indicating that the presence of mycorrhizae may also enhance the resistance of white pine to simazine. No apparent differences were noted in simazine absorption between inoculated and noninoculated red pine.

Document Type: Journal Article

Affiliations: Professor of Horticulture, Michigan State Univ., East Lansing

Publication date: September 1, 1964

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