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- W2995079917 abstract "Abstract Background Grazing is an important land use in northern China. In general, different grazing intensities had a different impact on the morphological and physiological traits of plants, and especially their photosynthetic capacity. We investigated the responses of Leymus chinensis to light, medium, and heavy grazing intensities in comparison with a grazing exclusion control. Results With light grazing, L. chinensis showed decreased photosynthetic capacity. The low chlorophyll and carotenoid contents constrained light energy transformation and dissipation, and Rubisco activity was also low, restricting the carboxylation efficiency. In addition, the damaged photosynthetic apparatus accumulated reactive oxygen species (ROS). With medium grazing, more energy was used for thermal dissipation, with high carotene content and high non-photochemical quenching, whereas photosynthetic electron transport was lowest. Significantly decreased photosynthesis decreased leaf C contents. Plants decreased the risk caused by ROS through increased energy dissipation. With high grazing intensity, plants changed their strategy to improve survival through photosynthetic compensation. More energy was allocated to photosynthetic electron transport. Though heavy grazing damaged the chloroplast ultrastructure, adjustment of internal mechanisms increased compensatory photosynthesis, and an increased tiller number facilitated regrowth after grazing. Conclusions Overall, the plants adopted different strategies by adjusting their metabolism and growth in response to their changing environment." @default.
- W2995079917 created "2019-12-26" @default.
- W2995079917 creator A5005671044 @default.
- W2995079917 creator A5007582930 @default.
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- W2995079917 creator A5043712618 @default.
- W2995079917 creator A5058312076 @default.
- W2995079917 creator A5064225859 @default.
- W2995079917 date "2019-12-01" @default.
- W2995079917 modified "2023-10-16" @default.
- W2995079917 title "Differences in the photosynthetic and physiological responses of Leymus chinensis to different levels of grazing intensity" @default.
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