Effect of the transgenerational exposure to elevated CO2 on low temperature tolerance of winter wheat: Chloroplast ultrastructure and carbohydrate metabolism |
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| Authors: | Hui Li Shengqun Liu Junhong Guo Fulai Liu Fengbin Song Xiangnan Li |
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| Institution: | 1. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun, China
University of Chinese Academy of Science, Beijing, China;2. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun, China;3. Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Tåstrup, Denmark |
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| Abstract: | The transgenerational effect of elevated atmospheric CO2 concentration (eCO2]) on low temperature response in wheat is still little investigated, through the interaction of eCO2], and low-temperature stress has been reported in a single generation. Here, the low temperature-induced modifications of chloroplast ultrastructure and carbohydrate metabolism in wheat after four generations continuously grown under ambient CO2 concentration (aCO2]) and eCO2] (2014–2018) were investigated. The results indicated that the transgenerational exposure to eCO2] increased the number of grana lamellae and the amounts of osmiophilic lipid droplets, attenuating the negative effect of low temperature on chloroplast ultrastructure. The transgenerational eCO2] enhanced the activities of antioxidant enzymes (i.e. SOD, POD and CAT) and concentrations of osmotic substances (i.e. proline and soluble sugar), which alleviated the low temperature-induced oxidative damage to the chloroplast ultrastructure. In addition, transgenerational exposure of wheat to eCO2] increased activities of vacInv and cwInv, while decreased fructokinase activity, which affected the sucrose metabolism in wheat leaf. These findings elucidated that transgenerational exposure to eCO2] could improve low temperature tolerance of winter wheat, which provide novel insights to the response of wheat to future climate change. |
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| Keywords: | carbohydrate metabolism chilling elevated CO2 Triticum aestivum ultrastructure |
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