Abstract:

In order to study the effect of facility cultivation on photosynthetic characteristics of Myrica rubra leaves. Experiment was carried out in May 2011 with cv. ‘Dingao’ as test materials (cultivar at development stage). The daily variation of eco-physiological factors of Myrica rubra on the internal and external greenhouse were measured using Li-6400 portable photosynthesis system in May, 2011: net photosynthetic rate (Pn), intercellular CO2 concentration (Ci), photosynthetic available radiation (PAR), leaf temperature (Tleaf), air relative humidity (RH) and so on. Also light response, CO2 response curve of ‘Dingao’ leaves on the internal and external greenhouse was measured to study the effects of facility cultivation on photosynthetic characteristics of Myrica rubra. The results showed that: Pn curves of Myrica rubra were both double-peak, the CO2 compensatory point, CO2 saturation point and net photosynthetic rate on the internal greenhouse were higher than that on the external greenhouse; there existed a hyperbolic relationship between Pn and PAR. A conic-curve relationship was found between CO2 concentration and RH, a cubic-curve relationship between Pn and Tleaf. The photosynthetic characteristics of Myrica rubra and environmental factors had a close relationship. The results could provide theoretical support for environment control of facility Myrica rubra.