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Publication Type:
| Refereed |
Author(s): | Hubbard, Joanna;
Whitwell, Ted |
Author Affiliation: | Hubbard: Graduate Research Assistant; and Whitwell: Professor, Department of Horticulture, Clemson University, Clemson, South Carolina |
Title: | Techniques for detecting grass tolerance to sethoxydim and fenoxaprop-ethyl herbicides |
Source: | Weed Science. Vol. 39, No. 4, October-December 1991, p. 548-552. |
Publishing Information: | Champaign, IL: Weed Science Society of America |
# of Pages: | 5 |
Keywords: | TIC Keywords: Herbicide resistance; Sethoxydim; Fenoxaprop-ethyl; Herbicides; Photosynthesis; Chlorophyll; Calamagrostis; Sorghum halepense; Eremochloa ophiuroides
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Abstract/Contents: | "Measurements of net photosynthesis, chlorophyll a fluorescence and solute leakage were evaluated as techniques for rapid detection of grass tolerance to fenoxaprop-ethyl and sethoxydim. Net photosynthesis measured as net CO2 uptake of the youngest fully expanded leaf of Calamagrostis arundinacea 'Karl Foerster' (Feather Reed Grass) detected tolerance to fenoxaprop-ethyl and susceptibility to sethoxydim 4 days after treatment and prior to the observation of visual injury. Sethoxydim reduced photosynthesis compared to untreated controls but fenoxaprop-ethyl did not. Measurements of older leaf (second most recently fully expanded leaf) photosynthesis were less consistent than those of the younger leaf. Chlorophyll a fluorescence of Calamagrostis leaf segments following treatment with fenoxaprop-ethyl and sethoxydim was ineffective for detecting grass tolerance. Solute leakage from leaf discs treated with 50 to 500 µg ml-1 fenoxaprop-ethyl and 10 to 100 µg ml-1 sethoxydim indicated differential tolerance of Calamagrostis and johnsongrass to fenoxaprop-ethyl and centipedegrass and johnsongrass to sethoxydim. Fenoxapropethyl increased solute leakage from susceptible johnsongrass at 100 µg ml-1 while the 500 µg ml-1 concentration was required to cause substantial solute leakage from tolerant Calamagrostis. Sethoxydim caused greater leakage from johnsongrass than from centipedegrass at 50 and 100 µg ml-1. The best potential rapid screening technique was solute leakage measurements." |
Language: | English |
References: | 15 |
Note: | Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Hubbard, J., and T. Whitwell. 1991. Techniques for detecting grass tolerance to sethoxydim and fenoxaprop-ethyl herbicides. Weed Sci. 39(4):p. 548-552. |
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