PJB-2017-619
PHRAGMITES AUSTRALIS LEAF HETEROGENEITY IN CHLOROPHYLL FLUORESCENCE PARAMETERS UNDER DIFFERENT LIGHT INTENSITIES
QUN LI
Abstract
To study the light adaptability of Phragmites australis, we were selected three different light intensities plot I (1200 µmol•m-2•s-1), plot II (800 µmol•m-2•s-1) and plot III (400 µmol•m-2•s-1) in field condition, and photosynthetic characteristics and chlorophyll content were measured. IMAGING-PAM chlorophyll fluorescence system and GFS-3000 portable photosynthesis measuring system was used to determine photosynthetic characteristics. The results showed that with the reduction of light intensity, the leaf area (LA), net photosynthetic rate (Pn) and chlorophyll content were presented increases trends, while leaf thickness, stomatal conductance (Gs) and intercellular CO2 concentration (Ci) were revealed opposite trends. The Y(II) (effective PS-II quantum yield) took on the trend increased first and decreased afterwards, and Fv/Fm (maximal PS-II quantum yield) were displayed opposite changing trends, however, both Fv/Fm and Y(II) showed a trend of reduce overall. The ETR (electron transport rate) value was lower at 400 µmol•m-2•s -1 intensity compared with other two sample area. Besides, with the light intensity increasing, the ETR values saturated under three conditions. The results of chlorophyll fluorescence parameters showed that especially weak light intensity created stress condition in reeds compared to high light intensity, but no affected the normal growth and development under nature environment.
Key words: Phragmites australis, Chlorophyll fluorescence, Light intensity, maximal PS-II quantum yield (Fv/Fm), electron transport rate (ETR).
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