| |
| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=112
Last checked: 07/15/2013
Requires: PDF Reader
Notes: Item is within a single large file |
|---|
| Publication Type:
| Report |
|---|
| Author(s): | Groves, F. E.;
Smith, K. L.;
Burgos, N. R.;
Murphy, J. B. |
|---|
| Author Affiliation: | Groves and Smith: University of Arkansas, Southeast Research and Extension Center, Monticello; Burgos: Department of Crop, Soil, and Environmental Sciences; Murphy: Department of Horticulture, University of Arkansas, Fayetteville, AR |
|---|
| Title: | Influence of growth stage on sugar translocation and control of yellow nutsedge |
|---|
| Section: | Weed management in agronomic crops
Other records with the "Weed management in agronomic crops" Section
|
|---|
| Meeting Info.: | Houston, Texas: January 27-29, 2003 |
|---|
| Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 26-27. |
|---|
| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
|---|
| # of Pages: | 2 |
|---|
| Keywords: | TIC Keywords: Cyperus esculentus; Evaluations; Growth stages; Sugars; Translocation; Weed control
|
|---|
| Abstract/Contents: | "Studies were conducted in the greenhouse and field during 2001 and 2002 to determine if a correlation exists between plant growth stage and basipetal translocation of carbohydrates. If such a relationship could be determined, an improved understanding of C. esculentus (yellow nutsedge) may be achieved. Greenhouse studies were conducted in Fayetteville, utilizing a completely randomized design. Three tubers we re planted into a potting soil/sand mixture (50% v/v) contained in a 10-cm pot. Plants were coll ected from the 1- to 9-lf stage. In one study plants were dissected into various tissues for sugar analysis by high-performance liquid chromatography (HPLC). In a separate study plants were chemically treated for herbicide efficacy. Plants selected for HPLC analysis were separated anatomically into tubers, shoots, old leaves, new leaves (upper three leaves), and secondary tubers. The plant parts were frozen, freeze-dried, and ground. Fructose, glucose and sucrose was extracted by boiling ground tissues, and analyzed using a HPLC with a refractive index detector. Sugars were quantified and expressed as μ g/g fresh dry weight (FDW). Sucrose content was greater than that of the hexoses among all plant parts. However, the three sugars followed the same general trends when sugar content (μ g/g FDW) was evaluated relative to plant growth stage. The sucrose content of the primary tuber gradually increased until reaching a maximum (> 40 μ g/g) at the fifth to sixth leaf stages. A sharp decrease to 10 μ g/g FDW was observed at the seventh leaf stage and sucrose content remained low until the ninth leaf stage. The sucrose content of the new leaf was inversely related to sucrose content of the primary tuber. Sucrose content decreased sharply from 30 μ g/g FDW to 22 μ g/g FDW from the fifth to sixth leaf stages, respectively. Sucrose content of the new leaf increased gradually until reaching a maximum at the eighth leaf stage at > 35 μ g/g FDW and declined thereafter. A decrease in sucrose content among all plant parts occurred at the eighth leaf stage resulting in similar content in all tissues at the ninth leaf stage. In a spray chamber, plants were treated with glyphosate at 0.84 kg ae/ha or trifloxysulfuron at 0.019 kg ai/ha + 0.25% non-ionic surfactant (NIS). Plants were returned to the greenhouse and evaluated at 10 days after treatment (DAT) for visual injury using a scale from 0 to 100 with 0 representing no injury. Treatments were applied at 140 L/ha using compressed air as the propellant and water as the carrier. Glyphosate provided > 65% control at the two- to four-leaf stage. Control decreased to < 30% when glyphosate was applied at the five- to seven-leaf stages and increased to > 85% at the eight- and nine-leaf stages. Trifloxysulfuron provided > 70% control for leaf stages five through seven. Control improved to > 85% for the eighth- and ninth-leaf stages. In greenhouse studies, a correlation was observed between plant growth stage, sugar translocation, and herbicide efficacy. During the 5- to 6-leaf stage, sucrose content was the highest and glyphosate injury was lowest. At the 8- and 9-leaf stage, sucrose content was lowest while glyphosate and trifloxysulfuron injury was the greatest. Field trials were conducted at Rohwer in 2001 on a Hebert silt loam. Cotton variety DP451 BRR was planted on 0.096 m-rows, using a conventional planting method. Plots were 3.86 x 9.14 m and utilized a complete randomized block design. Plots were furrow irrigated as required. Early-postemergence (EP), mid-postemergence (MP) directed, and late-postemergence (LP) directed applications were evaluated at 14 DAT. An EP application of Glyphosate at 0.84 kg ae/ha provided 80% control while trifloxysul furon at 0.013 kg ai/ha offered 70% control. Directed MP and LP applications of glyphosate provided > 90% control and trifloxysulfuron 2003 Proceedings, Southern Weed Science Society, Volume 56 Section I 27 offered > 80% control. The greenhouse findings were not consistent with observations from the field trials. The role of starch in this correlation remains unclear. Starch analysis is being conducted and 14C CO 2 tests have been proposed to trace photosynthates and gain a better understanding of sugar translocation within the plant." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | "Invasive weeds: Real or imagined threat?"
This item is an abstract only! |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Groves, F. E., K. L. Smith, N. R. Burgos, and J. B. Murphy. 2003. Influence of growth stage on sugar translocation and control of yellow nutsedge. South. Weed Sci. Soc. Proc. 56:p. 26-27. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=224523 |
| If there are problems with this record, send us feedback about record 224523. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=112
Last checked: 07/15/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: b2207931 |
| Find from within TIC:
Digitally in TIC by file name: swssp2003 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
