Plant Physiol.
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Plant Physiology 84:1442-1446 (1987)
© 1987 American Society of Plant Biologists

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Molecular Biology and Gene Regulation

Atrazine Resistance in Chenopodium album

Low and High Levels of Resistance to the Herbicide Are Related to the Same Chloroplast PSBA Gene Mutation

Priscilla Bettini1, Sheila McNally2, Mireille Sevignac, Henri Darmency3, Jacques Gasquez and Michel Dron4

Laboratory of Plant Molecular Biology, UA 1128 CNRS, University of Paris Sud, Bat430, 91405 Orsay, France, Laboratory of Malherbology, INRA Dijon, BV 1540. 21034. Dijon cedex, France

In Chenopodium album two different levels of atrazine resistance have been found according to following criteria: lethal dose and leaf fluorescence curve. The intermediate (I) phenotype is represented by a low level of resistance and a typical I fluorescence curve. It arose at high frequency, within one generation, after self-pollination of particular plants displaying a susceptible (S) phenotype. The resistance phenotype (Ri) has a high level of resistance and presents a typical resistant fluorescence curve. It appeared after self-pollination of chemically treated I plants. The I, Ri, and also R (resistant plants found in atrazine treated fields) phenotypes contain a serine to glycine mutation at amino acid position 264 in the chloroplast psbA gene product. The steady state level of the psbA gene transcript is not modified between S, I, Ri, and R phenotypes.

1 Present address: Dipartimento di Biologia Animale e Genetica, Via Romana 17, Firenze, Italia.

2 Present address: School of Botany, University of Dublin, Trinity College, Dublin 2, Ireland.

3 Present address: Genetique et Physiologie du Developpement des Plantes, CNRS, 91190. Gif sur Yvette, France.

4 Present address: Plant Biology Laboratory, The Salk Institute, P. O. Box 85800, San Diego, CA 92138-9216.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1987 by the American Society of Plant Biologists