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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=329
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Bryson, C. T.;
Koger, C. H.;
Byrd, J. D. Jr. |
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| Author Affiliation: | Bryson and Koger: USDA-ARS, Southern Weed Science Research Unit, Stoneville; Byrd: Department of Plant and Soil Sciences, Mississippi State University, MS |
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| Title: | Environmental influence on leaf color of cogongrass |
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| Section: | Soil and environmenal aspects of weed science
Other records with the "Soil and environmenal aspects of weed science" Section
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| Meeting Info.: | Houston, Texas: January 27-29, 2003 |
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| Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 242. |
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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: Color varieties; Environmental factors; Imperata cylindrica
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| Abstract/Contents: | "Cogongrass [Imperata cylindrical (L.) Beauv.] is an aggressive perennial grass that is considered to be the world's seventh worst weed. Because of its aggressive, weedy habit in other countries, cogongrass was placed on the Federal Noxious Weed List after it was introduced into the United States. It was accidentally and purposely introduced into the southern United States between 1900 and 1920. Cogongrass has been reported as a weed in Alabama, Florida, Georgia, Louisiana, Mississippi, South Carolina, Texas, and Virginia, and it continues to spread northward. Unfortunately, some nurseries have sold cogongrass with reddish to maroon foliage as an ornamental grass under the names "Japanese bloodgrass" or "Red Baron." Several ornamental grass manuals provide warning statements to immediately remove these cultivars if they spread and/or revert back to the typical weedy green plants. Because reddish or maroon colors were observed in weedy cogongrass patches at various sites in temperate climates of the southern United States, we hypothesized that leaf color in some cogongrass biotypes might be attributed to environmental conditions, and that the leaves of red ornamental cultivars might also turn green under certain environmental conditions. Objectives of this research were to evaluate several cogongrass biotypes to determine environmental factors that may alter leaf color and to determine if there were leaf color differences among cogongrass biotypes exposed to various environmental conditions. The following cogongrass collections were evaluated for leaf color in differing temperature regimes: 2 - Askikalak, Iraq; 3 - Mobile, Mobile Co., Alabama; 7 - Basrah, Iraq; AL-CAM - Camden, Wilcox co., Alabama; MS-2 - Picayune, Pearl River Co., Mississippi; MS-3 - McNeil, Pearl River Co., Mississippi; and Red-1 - a red cultivar obtained from a bonsai garden in Ann Arbor, Michigan in 1986. Plants were maintained from rhizomes in a greenhouse (25/35 C N/D) at Stoneville, MS in 12-cm diameter pots and transferred into growth chambers for two weeks prior to data collection. Growth chamber experiments were conducted at temperature regimes of 10/ 10, 10/20, 10/30, 10/40, 20/20, 20/30, 20/40, 30/30, and 30/40 C night/day (N/D). Plants were watered daily. Newly formed, fully expanded leaves were removed from each cogongrass plant and digitally scanned. A digital library was maintained for leaves from each cogongrass biotype and temperature regime. Leaf color (red, green, and blue) was determined with Computer Image Analysis System software available from CID, Inc., Vancouver, WA and data were converted to percentage of an untreated control (20/30 N/D). Leaf color changed among temperature regimes for each of the cogongrass collections; however, the degree of color change varied among biotypes. At lower temperatures, Red-1 was red, but turned green at 30/30 and 30/40 C. Weedy cultivars were green at the higher N/D temperatures and all turned red to varying degrees at the lowest night temperature (10 C) or at the greatest N/D temperature differences (10/40 and 10/30 C). These studies demonstrated that leaf color in cogongrass is temperature dependent; however, research is needed to determine effects of additional temperature regimes and other environmental conditions on leaf color in cogongrass." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Invasive weeds: Real or imagined threat?"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bryson, C. T., C. H. Koger, and J. D. Jr. Byrd. 2003. Environmental influence on leaf color of cogongrass. South. Weed Sci. Soc. Proc. 56:p. 242. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=329
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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