Decreased energy synthesis is partially compensated by a switch to sucrose synthase pathway of sucrose degradation in restricted root of tomato plants |
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| Authors: | Kai Shi Li-Jun Fu De-Kun Dong Yan-Hong Zhou Jing-Quan Yu |
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| Institution: | aDepartment of Horticulture, Huajiachi Campus, Zhejiang University, Kaixuan Road 268, Hangzhou 310029, PR China;bKey Laboratory of Horticultural Plants Growth, Development and Biotechnology, Agricultural Ministry of China, Kaixuan Road 268, Hangzhou 310029, PR China;cThe Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, PR China |
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| Abstract: | Tomato (Solanum lycopersium L.) plants were grown hydroponically to investigate the changes of energy metabolism and adaptive mechanism in response to root restriction. Root restriction resulted in a significant increase in root lipid peroxidation and reduction in leaf net CO2 assimilation rate, which was accompanied by increase of alcohol dehydrogenase (ADH; EC 1.1.1.1) and lactate dehydrogenase (LDH; EC 1.1.1.27) activities. Total, cytochrome pathway, and alternative pathway respirations were all decreased in the roots after 15 days of root restriction treatment. Accompanied with the decrease of ATP content, ratio of invertase/sucrose synthase activity was increased in the restricted roots together with a decrease in glucose content and an increase in fructose content. We concluded that the decreased energy synthesis under root restriction condition was partially compensated by the energy-conserving sucrose synthase pathway of sucrose metabolism. |
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| Keywords: | Alternative pathway respiration Carbohydrate Cytochrome pathway respiration Invertase Photosynthesis |
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