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2013 ASHS Annual Conference

15720:
A Continuous Canopy Photosynthesis Measurement System for CAM Plants

Tuesday, July 23, 2013: 5:00 PM
Desert Salon 1-2 (Desert Springs J.W Marriott Resort )
Dongxian He, China Agricultural University, Beijing, China
Zejing Zhang, China Agricultural University, Beijing, China
Guomin Zheng, Beijing Forestry University, Beijing, China
Rongfu Gao, Beijing Forestry University, Beijing, China
Genhua Niu, Texas A&M AgriLife Research Center at El Paso, El Paso, TX
Portable photosynthetic measurement based leaf gas exchange is one tool of most important photosynthesis research techniques. However, it is not suitable for CAM plants because of the main CO2 absorption in dark period and CO2 assimilation in photoperiod. Some facultative CAM plants always show certain amount of CO2 uptake in photoperiod, therefore lead to incorrect determination of the gas exchange characteristics. Therefore, a canopy photosynthesis continuous measurement system based on two leaf canopy chambers was developed and tested for obligate CAM plant (Kalanchoe daigremontiana), facultative CAM plant (Dendrobium officinale), C3 plant (Fragaria ananassa Duchesn), and C4 plant (Zea mays) under artificial and natural lightings. The results show that the canopy photosynthesis continuous measurement is not only suitable for quantitative evaluation of gas exchange characteristics in CAM plants, but also suitable in C3 and C4 plants with weak photosynthetic capacity.
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