Comparison on photosynthesis and chlorophyll fluorescence characteristics of leaves in different positions of cultivar'Jinba' of cut chrysanthemum ( Chrysanthemum morifolium) at post-budding and pre-blooming stages
Photosynthetic parameter diurnal changes, chlorophyll fluorescence parameters, and light response curves and parameters of leaves in different positions of cultivar 'Jinba' of cut chrysanthemum (Chrysanthemum morifolium Ramat.) at post-budding and pre-blooming stages were studied. The results show that at post-budding and pre-blooming stages, the diurnal changes in transpiration rate ( Tr ) , stomatal conductance ( Gs) and net photosynthetic rate ( Pn) of leaves of cultivar 'Jinba' all are single peak curves, with the peak values at 10:00 or 12:00, and that in intercellular CO2 concentration ( Ci) decreases at first and then increases, with the valley value at 12:00. In general, the average values of Tr, Ci and Gs of leaves of cultivar 'Jinba' at post-budding and pre-blooming stages increase gradually with decreasing of leaf position. There is a small differences in the average value of Pn of leaves among different leaf positions at post-budding stage, and the average value of Pn of leaves at pre-blooming stage decreases gradually with decreasing of leaf position. With decreasing of leaf position, initial fluorescence ( F o ) , the maximum fluorescence ( F m ) , variable fluorescence ( F v ) , apparent quantum efficiency (AQE) and the maximum net photosynthetic rate (Pmax) of leaves of cultivar 'Jinba' at post-budding and pre-blooming stages, and dark respiration rate ( Rd) at post-budding stage decrease gradually, while Rd value at pre-blooming stage and light compensation point ( LCP ) at post-budding and pre-blooming stages increase gradually. With increasing of photosynthetically active radiation ( PAR), Pn value of leaves in different leaf positions at post-budding stage and that of middle and lower leaves at pre-blooming stage increase sharply at first and then change to be steady, while that of upper leaves at pre-blooming stage increases sharply at first and then decreases gradually. It is suggested that during the facility cultivation process of cut chrysanthemum, appropriate light supplement can enhance quality of cut chrysanthemum.
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