Technique of the Modulated Chlorophyll Fluorescence: Basic Concepts, Useful Parameters, and Some Applications

Leaf Growth, Gas Exchange and Chlorophyll Fluorescence Parameters in Response to Different Water Deficits in Wheat Cultivars

“…The decrease in qP suggest that water defi cit might harm PSII reaction centers and promote closure of PS reaction centers (Fig. 2G) (Roháček and Barták, 1999). We also found that non-photochemical quenching was signifi cantly increased by water defi cit (Fig.…”

“…ΦPSII and ETR decreased under water defi cit conditions (Fig. 2C, F) mainly because water defi cit decreased the effi ciency of excitation energy capture of open PSII reaction centers (Roháček and Barták, 1999). The decrease in qP suggest that water defi cit might harm PSII reaction centers and promote closure of PS reaction centers (Fig.…”

“…2E), implying that a moderate water deficit had no effect on the primary photochemistry of PSII (Subrahmanyam et al, 2006;Santosi et al, 2009). ETR, ΦPSII and qP under 55%FC tended to be higher than those under 85%FC in XN889 (Fig.…”

“…Reduced photosynthesis due to water deficit can be caused by a reduction in light interception due to smaller leaf area and specifi c leaf area, by a reduction in carbon fi xation per unit leaf area, or by damage to the photosynthetic apparatus (Castrillo et al, 2001;Bruce et al, 2002). The effects of water deficit on leaf photosynthetic parameters have been a subject of research for over three decades (Santosi et al, 2009). Some authors reported that reduction in photosynthetic activity due to water deficit is primarily the result of stomatal closure (Shangguan et al, 1999).…”

Exogenously Applied Nitric Oxide Enhances the Drought Tolerance in Hulless Barley

“…ΦPSII and ETR decreased mainly because water deficit decreased the efficiency of excitation energy capture of open PSII reaction centers (Fig. 2f, g) (Roháček and Barták, 1999). The decrease in qP suggests that water deficit might harm the PSII reaction centers and promote closure of PS reaction centers (Fig.…”