Leaf gas exchange and chlorophyll fluorescence of Glycyrrhiza uralensis Fisch at two water supplies (equivalent to 240 mm for present precipitation and to 120 mm for future decreasing precipitation) were compared. There was a midday depression in net photosynthetic rate (P N) for either treatment, but stomatal limitation was dominant for present precipitation treatment and non-stomatal limitation for the drought treatment. Compared with present precipitation treatment, P N, stomatal conductance (g s) and transpiration rate (E) were always lower at drought stress, but stomatal limitation value (L s) and water use efficiency (WUE) were higher in the morning. The decrease in carboxylation efficiency (CE), apparent quantum yield (AQY), light-saturated photosynthetic rate and maximal photochemical efficiency of photosystem 2 (PS 2) (F v/F m) suggested that rubisco activity reduced and PS 2 partially inactivated during the day under drought. However, part of this inactivation of PS 2 might be alleviated due to increased thermal dissipation under drought.
Russian Journal of Ecology – Springer Journals
Published: Nov 5, 2014
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