PJB-2018-885
VERTICAL PROFILE OF PHOTOSYNTHETIC LIGHT RESPONSE PARAMETERS WITHIN RICE CANOPY
YUPING LV
Abstract
Photosynthetic light response curves of rice leaves at different leaf positions were measured and fitted to characterize vertical distribution of photosynthetic traits within canopy. The results showed that net photosynthetic rates at a specific light intensity was the highest for the top second leaf, and decreased considerably from the top second to the bottom leaf. Among upper canopy, the light-saturated net photosynthetic rate, initial quantum yield of assimilation, dark respiration rate, light compensation point and light saturation point kept high values and decreased slightly with lowering leaf positions, while were significantly lower at low canopy. The results were meaningful for upscaling leaf photosynthesis to canopy scale, which is essential for estimating the overall canopy photosynthesis or biomass productivity precisely.
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