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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1989/17870, Texas A&M, Beard.PDF
Last checked: 03/25/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Beard, James B. |
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| Author Affiliation: | Turfgrass Physiologist, Texas A&M University |
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| Monograph Title: | Sixth Mid-Year Progress Report Concerning Physiological Investigations in Developing Water Conserving, Minimal Maintenance Turfgrasses and Cultural Systems, 1989. |
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| Publishing Information: | [College Station, Texas]: Texas A&M University |
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| # of Pages: | 37 |
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| Collation: | i, 28, [8] pp. |
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| Abstract/Contents: | "This report represents the status report for the sixth mid-year of intensive research activity devoted to developing water conserving, minimal maintenance turfgrasses and cultural systems. The current status of the research objectives and individual studies under each of the original seven research objectives are summaries in the following table. A detailed review of the projected completion date for each of the on-going studies was conducted in February of 1989. The primary objective was to identify those projects which could definitely be completed by February of 1990 versus those which would require a longer time frame in which to accomplish. The primary concern being to identify those projects which could be fully completed and publishable by February of 1990 in case funding for the project is ceased. As shown in the above summary tale, a decision was made to set eight studies on hold and to place all our labor and resources on those projects which could be completed within the upcoming year. A flow diagram of the physiology research operations (March, 1989-April, 1990) is shown in the Appendix. A lab handout accompanies the flow diagram. Key studies which are projected to be completed during 1989 include the following: A-11 - Influence of cutting height and nitrogen-potassium nutritional levels on evapotranspiration rates of turfgrasses. A-14 - Comparative evapotranspiration rates of the New Mexico State bermudagrass selections. A-15 - Influence of a dull mower blade on evapotranspiration rates and leaf-canopy morphology. B-17 - Determine the effects of nitrogen and temperature on seasonal carbohydrate partitioning between the roots and shoots of grasses, especially as related to the physiological basis of minimal maintenance turfgrasses. B-18 - Determine if the carbon movement associate with spring root decline (SRD) can be altered by applications of plant growth regulators and hormones. B-19 - Determine the effect of water stress on root hair density and viability. B-20 - Assess root hair density, size, and viability among field-grown, warm-season turfgrasses. Reasonably good progress has been made in all of these areas. The studies involving genetic rooting potential, root hair viability and density, and carbohydrate partitioning are very labor intensive and thus time consuming. Undoubtedly this is one of the reasons very few attempts have been made to investigate these critical dimensions of water conserving, minimal maintenance turfgrasses. Considerable time and funds have been invested in the development of techniques for studying root hair density and viability, dehydration tolerance mechanisms related to the rate of stomatal closure/wax formation, and the carbohydrate partitioning mechanism that controls the low nitrogen requirement in turfgrasses. One additional year's funding in the order of $56,000 would allow the completion of four key research needs. 1. Determine the effects of key turfgrass cultural practices and root zone physical/chemical properties on turfgrass root hair density and viability. 2. Establish the specific effects of cutting height and nitrogen-potassium nutritional interactions on dehydration avoidance and drought resistance of turfgrasses under field conditions. 3. Provide definitive data on the relative interspecies dehydration tolerance, a major component of drought resistance, and the allied roles of rate of stomatal closure and wax formation. This would complete our understanding of the major components of drought resistance (see table on following page). For turfgrass breeding programs, it will serve as the basis to establish specific priorities in selecting plant components that will contribute the most to drought resistance. 4. Investigate the hormonal (internal plant growth regulator) control involved in the uniform partitioning of carbohydrates between the shoots and roots, which this project has identified as critical in turfgrasses having a low nitrogen requirement. A key dimension is the potential for identification of a plant growth regulator that can be applied externally to turfgrasses to reduce their nitrogen requirement." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article, "Plant Stress Mechanisms", 1989 Turfgrass Research Summary [USGA/GCSAA], 1989, p. 31, R=17870. R=17870 |
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| Note: | "Jointly Sponsored By: United States Golf Association and Texas Agricultural Experiment Station"
"April 30, 1989"
Includes appendix; pp. [29-36]
Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
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| Web URL(s):
http://archive.lib.msu.edu/tic/rpr/1989/17870, Texas A&M, Beard.PDF
Last checked: 03/25/2013
Requires: PDF Reader |
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MSU catalog number: b5288203 |
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