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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Forrester, G. R.;
Green, R. L.;
Beard, J. B. |
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| Author Affiliation: | Texas A&M Univ. |
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| Title: | Seasonal Photosynthate Partitioning in St. Augustinegrass as Influenced by Temperature and Nitrogen. |
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| Meeting Info.: | Held: October 15-20, 1989, Las Vegas, NV |
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| Source: | Agronomy Abstracts. Vol. 81, October 1989, p. 157. |
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| Publishing Information: | Madison, WI: American Society of Agronomy |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Stenotaphrum secundatum; Temperatures; Nitrogen fertilizers; Photosynthate partitioning; Carbohydrates; Application rates; Dormancy; Discoloration; Liquid scintillation counting
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| Abstract/Contents: | "The objective of this study was to determine the partitioning of available and reserve carbohydrates along with the fate of 14C-labeled carbohydrate as influenced by N and temperature in 'Texas Common' St. Augustinegrass (Stenotaphrum secundatum). Turfed plugs were planted in PVC columns (10 cm diam, 30 cm long) containing fine sand and allowed to establish under standard greenhouse conditions for six weeks. Next, turfs were placed on a fertility regime having three different N levels (79, 49 and 25 kg N ha-1 month-1) applied weekly in a modified nutrient solution. After plants were allowed to adjust to N levels for eight months, they were placed in a 133-L plexiglass chamber and exposed to 14CO2. Replications from each N treatment were placed in separate growth chambers for temperature treatments. One set was conditioned into a rapid dormancy at 5 degrees C while the other set was conditioned into a slow dormancy by gradually reducing temperature. The turfs were harvested at an actively growing phase, 50% leaf discoloration and 100% leaf discoloration. Harvesting involved separating plants into seven sections: leaf, stem, bud, upper 15 cm roots, lower 15 cm roots, immature leaves and sheaths and remaining plant tissue. Carbohydrate content (hexose equivalents) was assayed by the phenol/sulfuric technique in two fractions: ethanol soluble carbohydrates and enzyme extracted starch. Radioactivity in both fractions, and residual tissue, was assayed by liquid scintillation. Tissue weights indicated a greater mass in roots and buds for the high and low N levels with differing label quantity." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related thesis, Seasonal Photosynthate Partitioning in Stenotaphrum Secundatum as Influenced By Temperature and Nitrogen, 1991, R=302024. R=302024 |
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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):
Forrester, G. R., R. L. Green, and J. B. Beard. 1989. Seasonal Photosynthate Partitioning in St. Augustinegrass as Influenced by Temperature and Nitrogen.. Annu. Meet. Abstr. 81:p. 157. |
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MSU catalog number: S 1 .A58 |
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