Mechanism of Isoxaben Tolerance in Agrostis palustris var. Penncross

Previous work has demonstrated that isoxaben tolerant mutants of Arabidopsis thaliana var. Columbia are most likely altered at the site of isoxaben binding. The salient question becomes whether or not species selectivity to this herbicide might also be a result of differential target site binding. G...

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Bibliographic Details
Published in:Journal of experimental botany 1993-07, Vol.44 (7), p.1185-1189
Main Authors: HEIM, D. R., BJELK, L A., JAMES, J., SCHNEEGURT, M. A., LARRINUA, I. M.
Format: Article
Language:English
Subjects:
Acid soils
Adaptation to environment and cultivation conditions
Agronomy. Soil science and plant productions
Agrostis
Arabidopsis
Biological and medical sciences
Biosynthesis
Cell walls
cellulose
Fatty acids
Fractionation
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
Germination
Herbicide resistance
herbicide tolerance
Herbicides
Isoxaben
Plants
Seedlings
Varietal selection. Specialized plant breeding, plant breeding aims
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Summary:Previous work has demonstrated that isoxaben tolerant mutants of Arabidopsis thaliana var. Columbia are most likely altered at the site of isoxaben binding. The salient question becomes whether or not species selectivity to this herbicide might also be a result of differential target site binding. Grasses are generally more tolerant to isoxaben than dicots. In this communication we show that Agrostis palustris var. Penncross, a grass, is 83-fold more tolerant in a soil incorporation test and 170-fold more tolerant to inhibition of glucose incorporation into cellulose than is Arabidopsis, a dicot. Cell wall fractionation of Agrostis shows a specific effect on cellulose biosynthesis. At most, 5-fold of the 170-fold tolerance exhibited by Agrostis in terms of cellulose biosynthesis can be attributed to decreased isoxaben uptake under the test conditions. Furthermore, Agrostis is unable to metabolize isoxaben to any significant degree. Therefore, we suggest that the major portion of the tolerance in Agrostis might be due to differences in isoxaben binding.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/44.7.1185