Effects of Black Film on Photosynthesis and Chlorophyll Fluorescence Parameters of Sweet potato

doi:10.11924/j.issn.1000-6850.casb14120044

Abstract

Abstract: The paper aims to reveal the mechanism of photosynthesis of black film on the yield of sweet potato. Taking‘Yan Shu 25’as test material, the author set black film and non-covered (CK) treatments to study the effects of black film on photosynthesis and chlorophyll fluorescence characteristics of the sweet potato. The results showed that black film significantly increased Pn and Cond values of sweet potato (P＜0.05), and both were positive linear correlation. Ic, Isat and Pmax values were also increased significantly. With the intensity increasing, the ETR, PCR and qP values of sweet potato gradually increased, and PhiPS2, Fv'/Fm' and NPQ values gradually decreased. When the light intensity was more than 1500 μmol/(m² · s), the fluorescence parameters (ETR, PCR, PhiPS2, Fv'/Fm' and qP) of sweet potato by the black film increased significantly, and NPQ value reduced. Fresh weight and dry weight of sweet potato covered by black film were increased by more than 40% and 31%, respectively. Therefore, black film can significantly improve the efficiency of absorption and purveyance of photon at high intensity, further enhance the conversion rate of energy and the adaptation to the high intensity environment, and ultimately improve photosynthetic capacity of sweet potato.

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