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| Web URL(s): | https://dl.sciencesocieties.org/publications/aj/pdfs/83/4/AJ0830040689
Last checked: 12/14/2016
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| Publication Type:
| Refereed |
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| Author(s): | Howard, Harold F.;
Watschke, Thomas L. |
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| Author Affiliation: | Del E. Webb's Recreation Centers of Sun City West, Inc., Phoenix, AZ; Department of Agronomy, The Pennsylvania State University |
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| Title: | Variable high-temperature tolerance among Kentucky bluegrass cultivars |
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| Source: | Agronomy Journal. Vol. 83, No. 4, July/August 1991, p. 689-693. |
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| Publishing Information: | Washington: American Society of Agronomy |
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| Keywords: | TIC Keywords: Resistance; Temperatures; Poa pratensis; Stress; Cultivars
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| Abstract/Contents: | "The tolerance to chronic high-temperature stress varies greatly among Kentucky bluegrass (Poa pratensis L.) cultivars. This study of photosynthesis characteristics was conducted to determine whether such traits differ among cultivars and contribute to variable high-temperature tolerance. High-temperature-tolerant cultivars exhibited superior growth rates at 30° C but growth rates were similar among cultivars at 10° c. At 10° C, fructosan comprised an approximately two-fold larger portion of the plant dry weight than at 30° C, however nonstructural carbohydrate fractions did not differ among cultivars. Under each experimental temperature, the sum of glucose, fructose, and sucrose fractions did not differ among cultivars. Under each experimental temperature, the sum of glucose, fructose, and sucrose fractions was approximately the same, though the relative concentrations were temperature dependent. Apparently fructosan served as a buffer fraction that allowed the sum of the other nonstructural fractions to remain constant. Photosynthetic responses rates varied by as much as one-third among cultivars, however, with a positive relationship between net photosynthetic rates and high-temperature tolerance. These differences were not attributable to differential C=(oh) diffusive resistances. This evidence indicated that high-temperature-tolerant cultivars were capable of sustaining superior net photosynthetic rates under high but not low temperature conditions. It is suspected that cultivar differences in photosynthetic electron transport capacity may have caused this trend." |
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| Language: | English |
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| References: | 14 |
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| Note: | Contribution of the Pennsylvania Agric. Exp. Stn., Journal Series no. 8113.
Tables
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Howard, H. F., and T. L. Watschke. 1991. Variable high-temperature tolerance among Kentucky bluegrass cultivars. Agron. J. 83(4):p. 689-693. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/aj/pdfs/83/4/AJ0830040689
Last checked: 12/14/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 22 .A45 |
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