Responses of optimal photosynthesis temperature to changes in ambient temperature for Cinnamomum camphora and Osmanthus fragrans

Ci-cheng Zhang, Guang Han, Huade Guan, Cheng-hui Bao, Xin-ping Zhang

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    Abstract

    As an essential parameter in carbon cycle models, the photosynthetic optimal tempera-ture plays a key role in determining the model accuracy. Thus, it is of great importance to study the response of photosynthetic optimal temperature to changes in environmental temperature. In this study, photosynthetic temperature responses in leaves of Cinnamomum camphora and Osman-thus fragrans were examined by using the Li-6400XT photosynthetic analyzer (Li-Cor, Inc. , Lin-coln, Nebraska, USA) at 10-20 days intervals. Photosynthetic temperature response curves were fitted with an unsymmetrical parabolic curve, and the photosynthetic optimal temperature and maximum photosynthetic rate were calculated from the parameters of the fitted curves. Results showed that photosynthetic temperature response curves of both C. camphora and O. fragrans ex-hibited a pattern of parabolic curve, and the breadth of the curves had positive correlations with the ambient temperature. For the two species, the relationships between optimal temperature and ambient temperature showed significant linear correlations within a certain temperature range and the optimal temperature increased with the increase of ambient temperature, with C. camphora being more sensitive to changes in the ambient temperature than O. fragrans. The maximum pho-tosynthetic rate was linearly correlated with optimal photosynthetic temperature. Similarly, the maximum photosynthesis rate of C. camphora was more sensitive to changes in the optimum pho-tosynthetic temperature than that of O. fragrans. We concluded that C. camphora had a greater photosynthetic capacity than O. fragrans in terms of their abilities in response to change in ambi-ent temperature.

    Original languageEnglish
    Pages (from-to)2980-2987
    Number of pages8
    JournalChinese Journal of Ecology
    Volume33
    Issue number11
    Publication statusPublished - 10 Nov 2014

    Keywords

    • Ambient temperature
    • Cinnamomum camphora
    • Maximum photosynthetic rate
    • Osmanthus fragrans
    • Photosynthetic optimal temperature

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