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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=166
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | McCurdy, J. M.;
McElroy, J. S.;
Kopsell, D. A.;
Sams, C. E. |
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| Author Affiliation: | The University of Tennessee, Knowville, TN |
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| Title: | Effect of photoperiod and temperature on perennial ryegrass response to mesotrione |
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| Section: | Physiological and biological aspects
Other records with the "Physiological and biological aspects" Section
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| Meeting Info.: | Jacksonville, Florida: January 27-30, 2008 |
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| Source: | 2008 Proceedings, Southern Weed Science Society. Vol. 61, 2008, p. 181. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Herbicide efficacy; Herbicide evaluation; Lolium perenne; Mesotrione; Photoperiod; Temperature response
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| Abstract/Contents: | "Mesotrione, a carotenoid biosynthesis inhibitor, is currently being evaluated for its use in turfgrass. Mesotrione has been reported to injure perennial ryegrass (Lolium perenne L.). Variation in efficacy due to environmental conditions has been reported in other species. Understanding the effects of environmental conditions upon mesotrione efficacy may allow turfgrass managers to more effectively control weeds while minimizing injury to perennial ryegrass turf. A two by three by three factorial treatment arrangement was conducted to investigate the effects of light intensity and temperature on perennial ryegrass carotenoid composition following mesotrione application. Perennial ryegrass was treated with mesotrione (0.28 kg ai/ha plus a 0.25% v/v non ionic surfactant) and subsequently placed in an environmental growth chamber at 600, 1100, or 1600 μmol/m/s2 irradiance and 18, 26, or 34°C with a 16 hour photoperiod. Leaf tissue was harvested 3, 7, and 21 days after treatment (DAT). Percent bleaching and foliar-weight were recorded as an indication of mesotrione efficacy. Photochemical efficiency was measured using a modulated fluorometer as an indication of overall plant health. Carotenoids were quantified using HPLC analysis. All data were subject to ANOVA (P = 0.05). Irradiance levels did not affect mesotrione efficacy in perennial ryegrass. The highest amount of bleaching (18%) was observed in treated plants grown at 26 °C 3 DAT. High temperatures resulted in decreased foliar weights for both treated and non-treated perennial ryegrass, and treatment with mesotrione resulted in increased perennial ryegrass foliar weights. Treated plants displayed a lower photochemical efficiency than non-treated plants; although, plants grown at 18 and 26 °C recovered to the levels of the non-treated by 21 DAT. At no time did treated plants grown at 34 °C recover to the level of photochemical efficiency observed in non-treated plants grown at the corresponding temperature. Therefore, mesotrione should not be applied to perennial ryegrass during excess heat stress due to the potential for decreased photochemical efficiency and possible bleaching. Phytoene levels were undetectable in non-treated plants regardless of temperature level but increased to 1.9 mg/100g fresh weight in plants treated with mesotrione. Chlorophyll A, β-carotene, lutein, and violaxanthin levels decreased due to treatment with mesotrione. Despite carotenoid biosynthesis inhibition by mesotrione, the photoprotectant carotenoids antheraxanthin and zeaxanthin increased in mesotrione treated plants. These data indicate that mesotrione efficacy does not vary between the tested irradiance levels; however variation influenced by temperature does occur." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCurdy, J. M., J. S. McElroy, D. A. Kopsell, and C. E. Sams. 2008. Effect of photoperiod and temperature on perennial ryegrass response to mesotrione. South. Weed Sci. Soc. Proc. 61:p. 181. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=166
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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