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| DOI: | 10.1016/j.envexpbot.2010.10.007 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0098847210002054
Last checked: 04/16/2012 |
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| Publication Type:
| Refereed |
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| Author(s): | Höglind, Mats;
Hanslin, Hans M.;
Mortensen, Leiv M. |
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| Author Affiliation: | Grassland and Landscape Division, Norwegian Institute for Agricultural and Environmental Research (Bioforsk), Norway |
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| Title: | Photosynthesis of Lolium perenne L. at low temperatures under low irradiances |
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| Section: | Research papers
Other records with the "Research papers" Section
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| Source: | Environmental and Experimental Botany. Vol. 70, No. 2-3, February 2011, p. 297-304. |
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| Publishing Information: | Elsevier |
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| # of Pages: | 8 |
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| Keywords: | TIC Keywords: Air temperature; Carbon dioxide; Climatic change; Cold resistance; Diurnal variation; Frost injury; Gas exchange; Growth chambers; Irradiance; Light saturation; Lolium perenne; Photosynthesis; Photosynthetic photon flux density; Soil temperature; Soil warming systems; Temperature response
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| Abstract/Contents: | "To develop mechanistic models for winter survival of grasses under climate change, more knowledge is needed of photosynthetic activity at low irradiance and temperature. Photosynthetic activity of small stands of Lolium perenne was continuously studied for up to two weeks under low photosynthetic photon flux density (PPFD) in the air temperature range from -3 °C to +9 °C. The photosynthetic rate of plants growing at 2, 6 and 9 °C was similar at 120 μmol m-2 s-1 PPFD but the rate increased with increasing PPFD at all temperatures, particularly 9 °C. Light saturation of photosynthesis was reached at approx. 300 μmol m-2s-1 at 2 and 6 °C, and at approx. 600 μmol m-2 s-1 at 9 °C. At 300 μmol m-2 s-1, the CO2 exchange rate (CER) at 2 °C was approx. 60% of that at 9 °C. When the temperature increased gradually from 0 °C at start to +5 °C at the end of the 8-h photoperiod, CER decreased by about 20% compared with that at constant 5 °C. Changing the temperature from constant +5 °C to a diurnal variation between -2 and +2 °C gradually decreased daytime CER to approx. 10% after five days, partly due to leaf area losses (~50% loss) when the poorly acclimatised plants were exposed to frost. At start of the photoperiod at -2 °C CER was negative, but became slightly positive when temperature exceeded -1 °C after two hours. Total daily photosynthesis was negative due to night-time respiration in this treatment. Soil heating to avoid freezing when the diurnal air temperature fluctuated between -3 and +3 °C had no effect on CER at this low PPFD level (150 μmol m-2 s-1). In contrast to the -2/+2 °C treatment, total daily photosynthesis was slightly positive in the -3/+3 °C treatment, where the plants were better acclimatised to frost. Increasing the CO2 concentration from 350 to 600 μmol mol-1 had no effect on CER at 2 and 6 °C, but increased it by 20% at 9 °C. The data indicate that the minimum temperature for photosynthesis in the cultivar studied is about -4 °C. The results can be applied in different photosynthesis models." |
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| Language: | English |
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| References: | 27 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Höglind, M., H. M. Hanslin, and L. M. Mortensen. 2011. Photosynthesis of Lolium perenne L. at low temperatures under low irradiances. Environ. Exp. Bot. 70(2-3):p. 297-304. |
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| DOI: 10.1016/j.envexpbot.2010.10.007 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0098847210002054
Last checked: 04/16/2012 |
| 
MSU catalog number: b4885055 |
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