Abstract
This study investigates the effect of daily short-term (2 h) low temperature treatment (12 °C) (DROP) on photosynthetic water use efficiency (WUE) at leaf level of cucumber plants. The DROP treatment caused an increase of WUE in the leaves treated by DROP during their early growth (D1), but not in leaves which were already mature during the treatment (D2). The WUE increase in D1 compared to D2 leaves was due to higher net photosynthetic rate at low temperature or lower transpiration rate at common temperature. The elongation of the DROP treatment from early growth stage until full maturation of leaves did not lead to an additional increase in WUE compared to the leaves treated by DROP only during their early growth.
Highlights
Photosynthetic water use efficiency (WUE), calculated as the ratio between photosynthetic and transpiration rates, shows ability of plants to assimilate CO2 per unit water loss (Bacon, 2004)
This study investigates the effect of daily short-term (2 h) low temperature treatment (12 C) (DROP) on photosynthetic water use efficiency (WUE) at leaf level of cucumber plants
Vol 7, No 11; 2015 stomatal aperture and enhanced plant cold resistance, that can be associate with an acclimation of the photosynthetic apparatus to low temperature, we suggested that photosynthetic WUE of cucumber plants may be enhanced in response to the daily short-term temperature drop
Summary
Photosynthetic water use efficiency (WUE), calculated as the ratio between photosynthetic and transpiration rates, shows ability of plants to assimilate CO2 per unit water loss (Bacon, 2004). This efficiency parameter determines whether a plant leaf optimizes the ratio of carbon gain to water transpired as environmental conditions change (Swarthout et al, 2009). Increased photosynthetic capacity may cause the WUE rise (Medek et al, 2011; Gremer et al, 2012)
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