Full TGIF Record # 275203
Item 1 of 1
DOI:10.1016/j.envexpbot.2016.06.014
Web URL(s):http://www.sciencedirect.com/science/article/pii/S0098847216301289
    Last checked: 09/12/2016
    Access conditions: Item is within a limited-access website
Publication Type:
i
Refereed
Author(s):Vankoughnett, Mathew R.; Way, Danielle A.; Henry, Hugh A. L.
Author Affiliation:Department of Biology, University of Western Ontario, London, ON, Canada
Title:Late winter light exposure increases summer growth in the grass Poa pratensis: Implications for snow removal experiments and winter melt events
Source:Environmental and Experimental Botany. Vol. 131, November 2016, p. 32-38.
Publishing Information:Elsevier
# of Pages:7
Keywords:TIC Keywords: Biomass; Chlorophyll fluorescence; Dark respiration; Frost injury; Gas exchange; Growth analysis; Light relations; Photosynthetic rate; Poa pratensis; Snow removal
Abstract/Contents:"Reductions in snow cover over winter can increase frost exposure in herbaceous plants. Nevertheless, increased exposure to light can potentially increase plant carbon gain during periods of reduced snow cover. We used a combined field and growth chamber experiment to examine how variation in the timing and cumulative duration of light exposure over winter (from one to four 1-week incubation periods at 5 °C) affected subsequent summer growth in the grass Poa pratensis. We also measured net photosynthetic rates, dark respiration and chlorophyll fluorescence both 48 h and 120 h after the start of each winter light exposure period. Summer biomass increased by up to 50% for tillers exposed to light during the final winter incubation period (mid-late February), and the timing of light exposure, not the cumulative duration, was the most influential factor in increasing biomass. In contrast, for tillers incubated in the dark, multiple weeks of incubation at 5 °C resulted in the largest reductions in summer biomass. Leaf-level net photosynthetic rates were highest for the earliest and latest light exposure periods over winter, whereas dark respiration rates were highest in early winter and lowest in late winter. Thus, the gas exchange and biomass results were consistent in revealing that the last period of light exposure promoted the highest carbon gain. Overall, our results reveal that naturally occurring periods of snow melt over winter, or scenarios where snow is removed or melted as an experimental treatment, have the potential to benefit plant growth substantially, as opposed to simply rendering plants vulnerable to frost damage."
Language:English
References:44
Note:Figures
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vankoughnett, M. R., D. A. Way, and H. A. L Henry. 2016. Late winter light exposure increases summer growth in the grass Poa pratensis: Implications for snow removal experiments and winter melt events. Environ. Exp. Bot. 131:p. 32-38.
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DOI: 10.1016/j.envexpbot.2016.06.014
Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0098847216301289
    Last checked: 09/12/2016
    Access conditions: Item is within a limited-access website
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