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Differential Tolerance of Tomato Cultivars to Metribuzin

Published online by Cambridge University Press:  12 June 2017

G. R. Stephenson ,
J. E. McLeod  and
S. C. Phatak
G. R. Stephenson
Affiliation:
Dep. Environ. Biol., Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1
J. E. McLeod
Affiliation:
Dep. Environ. Biol., Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1
S. C. Phatak
Affiliation:
Hort. Res. Station, Simcoe, Ontario, Canada N3Y 4N5
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Abstract

Seedlings of fifteen different cultivars of tomato (Lycopersicon esculentum Mill.) varied greatly in tolerance to metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H) one] applied at a concentration of 0.5 mg/L in quartz sand nutrient culture during the three-true-leaf stage. Tolerance increased with seedling age, but acceptable tolerance was observed about 6 days earlier in the tolerant ‘Fireball’ compared to the susceptible ‘Heinz 1706′. Root uptake and acropetal translocation of metribuzin-carbonyl-14 C was similar in 2-week-old seedlings of susceptible Heinz 1706 and tolerant Fireball seedlings. Differential tolerance was related to the rate of detoxification by metabolism within the tomato leaves, which was approximatley two-fold greater in the tolerant Fireball seedlings.

Information

Type
Research Article
Information
Weed Science , Volume 24 , Issue 2 , March 1976 , pp. 161 - 165
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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