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Effect of Various Flavor-Related Compounds on Germination of Curly Dock Seed (Rumex crispus) and Curly Dock Rust (Uromyces rumicis)

Published online by Cambridge University Press:  12 June 2017

Richard C. French ,
Peter T. Kujawski  and
Gerald R. Leather
Richard C. French
Affiliation:
Plant Disease Res. Lab. and Weed Sci. Res. Lab., ARS, U.S. Dep. Agric., Ft. Detrick, Bldg. 1301, Frederick, MD 21701
Peter T. Kujawski
Affiliation:
Plant Disease Res. Lab. and Weed Sci. Res. Lab., ARS, U.S. Dep. Agric., Ft. Detrick, Bldg. 1301, Frederick, MD 21701
Gerald R. Leather
Affiliation:
Plant Disease Res. Lab. and Weed Sci. Res. Lab., ARS, U.S. Dep. Agric., Ft. Detrick, Bldg. 1301, Frederick, MD 21701
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Abstract

Chemicals that stimulate germination of curly dock seed (Rumex crispus L. # RUMCR) and urediniospores of curly dock rust [Uromyces rumicis Schum. (Wint.)], an obligate parasite of this weed, were studied and compared. Methyl salicylate, benzyl cyanide, and benzonitrile were the best stimulators of germination of curly dock seed. The compounds tested were most effective at concentrations ranging from 250 to 1000 μl/L. A 500 μl/L concentration of methyl salicylate caused 99% of the curly dock seed to germinate. Exposure to volatiles from 10 μl methyl salicylate or octyl cyanide for 16 to 24 h was required for maximum stimulation of curly dock seed germination in 10 days. Benzonitrile, methyl-2,4-dihydroxybenzoate, 3-cyanophenol, 2-heptanone, and benzaldehyde were the most effective of 45 compounds tested on urediniospores of curly dock rust. Benzonitrile was most active of 19 compounds tested on both seed and spores. Benzyl cyanide, 4-methoxybenzonitrile, benzaldehyde, and methyl 2,4-dihydroxybenzoate also were active on both propagules.

Keywords

Germination stimulatorsobligate parasiteurediniosporemethyl salicylatebenzonitrilebenzyl cyanideRUMCR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 398 - 402
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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