| |
| Web URL(s): | http://a-c-s.confex.com/crops/2010am/webprogram/Paper60820.html
Last checked: 10/20/2010
Notes: Abstract only |
|---|
| Publication Type:
| Report |
|---|
| Content Type: | Abstract or Summary only |
|---|
| Author(s): | Elmore, Matthew;
Brosnan, James;
Kopsell, Dean;
Breeden, Gregory |
|---|
| Author Affiliation: | University of Tennessee, Knoxville, TN |
|---|
| Title: | Methods of assessing bermudagrass responses to three HPPD inhibiting herbicides |
|---|
| Section: | Graduate student oral competition: Weed and insect management; pesticide fate
Other records with the "Graduate student oral competition: Weed and insect management; pesticide fate" Section
|
|---|
| Meeting Info.: | Long Beach, CA: October 31 - November 4, 2010 |
|---|
| Source: | 2010 International Annual Meetings: [Abstracts][ASA-CSSA-SSSA]. 2010, p. 60820. |
|---|
| Publishing Information: | [Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America |
|---|
| # of Pages: | 1 |
|---|
| Keywords: | TIC Keywords: 4-hydroxyphenyl pyruvate dioxygenase; Bleaching; Carotenoids; Chlorophyll fluorescence; Cynodon dactylon; Cynodon transvaalensis; Herbicide structure and activity; Mesotrione; Physiological responses; Tembotrione; Topramezone; Visual evaluation
|
|---|
| Cultivar Names: | Riviera; Tifway |
|---|
| Abstract/Contents: | "Mesotrione, topramezone, and tembotrione are herbicides that inhibit the enzyme 4-hydroxyphenyl pyruvate dioxygenase (HPPD) that is central to carotenoid biosynthesis. Herbicidal activity following treatment with HPPD inhibitors is commonly evaluated through visual ratings or assessments of chlorophyll fluorescence (Fv/Fm). Minimal information is available regarding the accuracy of these techniques for quantifying physiological changes in carotenoid and chlorophyll pigment concentrations following HPPD herbicide treatment. Research was conducted at the University of Tennessee to determine the accuracy of visual ratings and chlorophyll fluorescence measurements for evaluating physiological changes in carotenoid and chlorophyll pigment concentrations following treatment with mesotrione, topramezone, and tembotrione. Separate experiments were conducted on mature 'Riviera' common bermudagrass (Cynodon dactylon (L.) Pers.) and 'Tifway' hybrid bermudagrass (Cynodon dactylon (L.) Pers. x C. transvaalensis Burtt Davy.) maintained at a 2 cm in a glasshouse. Each study was arranged as a 3 x 3 factorial randomized complete block design with three replications. Plants were treated with three rates of mesotrione (0.28, 0.35, and 0.42 kg ha-1), topramezone (0.018, 0.025, and 0.038 kg ha-1), and tembotrione (0.092, 0.184, and 0.276 kg ha-1). Percent visual bleaching and chlorophyll fluorescence data were collected 3, 7, 14, 21, 28, and 35 days after application. Immediately following data collection, leaf material above 2 cm was harvested from individual plants and frozen at -80°C. Chlorophyll and carotenoid pigments were extracted from leaf tissue and quantified via high-performance liquid chromatography. Chlorophyll, lutein and xanthophyll cycle pigment concentrations were regressed over visual bleaching and chlorophyll fluorescence data. Comparisons of R-squared values indicated no distinct advantage to using chlorophyll fluorescence in place of visual ratings as a means of evaluating HPPD inhibiting herbicide activity. While several significant linear relationships were detected, R-squared values never exceeded 0.65, suggesting neither evaluation method can accurately quantify physiological changes in carotenoid and chlorophyll pigment concentrations following HPPD inhibiting herbicide treatment." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| See Also: | See also related article "Methods of assessing bermudagrass [Cynodon dactylon] responses to HPPD-inhibiting herbicides" International Annual Meeting, 2011, p. 2840-2845, R=191934 R=191934 |
|---|
| Note: | This item is an abstract only |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Elmore, M., J. Brosnan, D. Kopsell, and G. Breeden. 2010. Methods of assessing bermudagrass responses to three HPPD inhibiting herbicides. Int. Ann. Meet. p. 60820. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=170840 |
| If there are problems with this record, send us feedback about record 170840. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://a-c-s.confex.com/crops/2010am/webprogram/Paper60820.html
Last checked: 10/20/2010
Notes: Abstract only |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
