DENG Zhixian1, LI Chaochan1, WU Yanyou2
(1.School of Life Science/Key Laboratory of Plant Physiology and Development Regulation, Guizhou Normal University, Guiyang 550001, China;
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China )
Abstract: The cellular metabolic energy of plants can be used to characterize the physiological activity and source-sink status of plants, while the cellular metabolic energy of plants can be characterized by the physiological capacitance, physiological resistance and physiological impedance of the cells. This study took Broussonetia papyrifera and Morus alba as examples to study the characteristics of physiological resistance, physiological impedance and physiological capacitance under different clamping forces. The model is first constructed based on the Gibbs free energy equation and the Nernst equation, and then the plant leaf cell metabolic energy is jointly calculated based on the various parameters of the model. The results showed that the free energy obtained based on resistance calculation and impedance calculation is not much different; and the free energy of Morus alba leaf cells (8.858×10-12 J) is similar to that of Broussonetia papyrifera leaf cells (8.486×10-12 J), which indicates that the physiological activities of the two plants in the experimental environment are not much different; the range of free energy of Morus alba leaf cells (10.865×10-12 J) is smaller than that of Broussonetia papyrifera (19.684×10-12 J), indicating that the former has a smaller variation in physiological activity, and the source-sink relationship between the leaves of the latter is more flexible than the former; the effective thickness of Broussonetia papyrifera leaves is extremely poor (6.380×10-12 m) than that of Morus alba (3.999×10-12 m), which indicates that the morphological diversity is compatible with the functional diversity. This research method can characterize plant leaf cell metabolic energy online, quickly and non-destructively, and provides new methods and ideas for studying plant physiological activities and source-sink status.
Key Words: electrophysiological parameters; cell metabolic energy; source-sink relationship
EARTH AND ENVIRONMENT Vol.49, No.3, Tot No.341, 2021, Page 307-314