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| DOI: | 10.21273/JASHS.127.5.754 |
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| Web URL(s): | https://journals.ashs.org/jashs/view/journals/jashs/127/5/article-p754.xml
Last checked: 11/15/2019
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Xu, Qingzhang;
Huang, Bingru;
Wang, Zhaolong |
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| Author Affiliation: | Xu: Postdoctoral Research Associate, Department of Plant Science, Rutgers University, New Brunswick, NJ; Huang: Associate Professor, Department of Plant Science, Rutgers University, New Brunswick, NJ; Wang: Postdoctoral Research Associate, Department of Plant Science, Rutgers University, New Brunswick, NJ |
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| Title: | Photosynthetic responses of creeping bentgrass to reduced root-zone temperatures at supraoptimal air temperature |
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| Source: | Journal of The American Society for Horticultural Science. Vol. 127, No. 5, September 2002, p. 754-758. |
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| Publishing Information: | Alexandria, VA: American Society for Horticultural Science |
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| # of Pages: | 5 |
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| Keywords: | TIC Keywords: Photosynthesis; Agrostis stolonifera; Root zone temperature; Air temperature; Soil temperature; Cool season turfgrasses; Growth; Heat stress; Chlorophyll
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| Cultivar Names: | L-93; Penncross |
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| Abstract/Contents: | "High air and soil temperatures are major factors limiting growth of cool-season grasses. A previous study by the authors reported that a soil temperature reduction of only 3 °C when air temperature was maintained at 35 °C significantly improved shoot and root growth of creeping bentgrass [Agrostis stolonifera L. var. palustris (Huds.) Farw. (syn. A. palustris Huds.)]. This study was designed to investigate the responses of photosynthetic activities of creeping bentgrass to lowered root-zone temperatures from the supraoptimal level when shoots were exposed to high air temperature. Two cultivars of creeping bentgrass, `L-93' and `Penncross', were exposed to the following air/root-zone temperature regimes in growth chambers and water baths: 1) optimal air and soil temperatures (20/20 °C, control); 2) lowering soil temperature by 3, 6, and 11°C from 35 °C at high air temperatures (35/32, 35/29, and 35/24 °C); and 3) high air and soil temperatures (35/35 °C). Soil temperature was reduced from 35 °C by circulating cool water (18 °C) in water baths at variable flow rates. Both cultivars had similar responses to high or low root-zone temperatures with high air temperature. High air and root-zone temperatures caused significant reductions in canopy photosynthetic rate (Pcanopy), single-leaf photosynthetic rate (Pleaf), leaf chlorophyll content, photochemical efficiency (Fv/Fm), and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity, beginning on day 1 of high air and soil temperature stress for Pcanopy and Pleaf, and day 7 for chlorophyll content, Fv/Fm, and Rubisco activity. The 3 °C reduction in root-zone temperature at high air temperature had no effect on those photosynthetic parameters, except chlorophyll content. Reducing root-zone temperature by 6 °C or 11 °C while maintaining air temperature at 35 °C significantly improved Pcanopy, Pleaf, leaf chlorophyll content, Fv/Fm, and Rubisco activity. Single leaf photosynthetic rate at 35/24 °C was not different from the control level, but Pcanopy at 35/24 °C was lower than the control level. A reduction in root-zone temperature enhanced canopy and single-leaf photosynthetic capacity even though shoots were exposed to supraoptimal air temperature, which could contribute to improved turfgrass growth." |
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| Language: | English |
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| References: | 27 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Xu, Q., B. Huang, and Z. Wang. 2002. Photosynthetic responses of creeping bentgrass to reduced root-zone temperatures at supraoptimal air temperature. J. Am. Soc. Hortic. Sci. 127(5):p. 754-758. |
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| DOI: 10.21273/JASHS.127.5.754 |
| Web URL(s):
https://journals.ashs.org/jashs/view/journals/jashs/127/5/article-p754.xml
Last checked: 11/15/2019
Requires: PDF Reader |
| 
MSU catalog number: SB 1 .A46 |
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