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Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=278 Last checked: 08/01/2013 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Author(s): | Flessner, M. L.;
McElroy, J. S.;
Dute, R. R.;
Wehtje, G. R. |
Author Affiliation: | Auburn University, Auburn, AL |
Title: | Morphological and anatomical response of St. Augustinegrass to aminocyclopyrachlor |
Section: | Graduate student paper contest Other records with the "Graduate student paper contest" Section
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Meeting Info.: | Little Rock, Arkansas: January 25-27, 2010 |
Source: | 2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 228. |
Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Aminocyclopyrachlor; Apical meristem; Formaldehyde; Herbicide evaluation; Herbicide injury; Parenchyma; Stenotaphrum secundatum; Auxins
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Abstract/Contents: | "Aminocyclopyrachlor (AMCP) is a synthetic auxin herbicide that effectively controls a wide spectrum of broadleaf weeds. Previous research indicates St. Augustinegrass (Stenotaphrum secondatum (Walter) Kuntze) is readily injured by AMCP. In light of the fact that synthetic auxin herbicides are usually safe when applied to monocots, the mechanism for this injury is not fully understood. St. Augustinegrass-morphological and -anatomical response was investigated using light microscopy with the hypothesis that AMCP stimulates deleterious growth. Field and greenhouse tissue samples were collected two and four weeks after treatment (WAT). Fresh tissue samples were used for dissecting microscope observations. For light microscopy, samples were placed in formalin acetic acid for kill and preservation then prepared according to a paraffin wax technique and sectioned at 10 μm. Sections were stained with Toluidine Blue O, a non-specific, metachromatic stain. Treatments included AMCP (DPX-KJM44; DuPont Company, Wilmington, Delaware) at 0.005 and 0.112 kg ai ha-1. These rates were chosen because symptoms at the cellular level were clear and death of root or shoot tissue occurred. Treatments were applied with a CO2 powered sprayer calibrated at 280 L ha-1 at 4.8 km hr-1. Responses were consistent among samples. Two WAT, apical meristem node tissue responded with callus tissue proliferation, abnormal location and development of the apical meristem, necrosis surrounding the developing vascular tissue, vascular parenchyma proliferation, and xylem gum blockages. These developments most likely stress the plant by placing a higher demand for water and nutrients through the stimulation of growth, while at the same time inhibiting the plants ability to deliver water and nutrients through vascular inhibition. Four WAT, symptoms of AMCP treatment noted at two WAT were still present, with the additional stimulation of adventitious root formation and release of lateral meristems from apical dominance. Node tissues away from the apical meristem responded with xylem gum blockages and the stimulation of lateral meristems and adventitious root formation. These developments further stress the plant through increased water and nutrient requirements and additional vascular inhibition. Root tip response to AMCP treatment was similar at two and four WAT and was characterized by a loss of organization. Apical root tip meristem and vascular tissue maturation was disorganized. Additionally, lateral root generation occurred abnormally close to the root tip itself. These developments may impair the ability of the plant to uptake water. Mature tissue was unaffected by AMCP treatment. All of these responses are characteristic of synthetic auxin herbicide treatment to other susceptible species. St. Augustinegrass is susceptible to other auxinic herbicides including 2,4-D, MCPP, dicamba and triclopyr. St. Augustinegrass whole-plant response to these herbicides is similar to the response induced from AMCP treatment. This research indicates that AMCP treatment results in St. Augustinegrass injury and subsequent death through deleterious growth stimulation and concomitant vascular inhibition." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Flessner, M. L., J. S. McElroy, R. R. Dute, and G. R. Wehtje. 2010. Morphological and anatomical response of St. Augustinegrass to aminocyclopyrachlor. South. Weed Sci. Soc. Proc. 63:p. 228. |
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| Web URL(s): http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=278 Last checked: 08/01/2013 Requires: PDF Reader Notes: Item is within a single large file |
| MSU catalog number: b2207931 |
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