Читать книгу Physiology of Salt Stress in Plants - Группа авторов - Страница 32

The PSI is relatively less sensitive to salt stress than PSII and participates in the cyclic ETC in algae during the salt stress. The PSI could play a vital role in salt tolerance by increasing cyclic ETC generating ATP by photophosphorylation while avoiding the build‐up of toxic reducing species (Bose et al. 2017). The excess ATP generated through cyclic ETC around PSI has been suggested to prevent Na⁺ overaccumulation in the chloroplasts of soybean (He et al. 2015). Two chloroplasts envelope antiporters CHX23 and NHD1 help plants to maintain the Na⁺ homeostasis between the chloroplast and the cytosol (Song et al. 2004). Light‐induced thylakoid swelling in salt‐stressed plants also facilitates the diffusion of the plastocyanin between cytochrome b6f complex and a PSI reaction center, enhancing the overall electron transfer rate (Kirchhoff et al. 2011) by cyclic ETC and producing ATP by photophosphorylation to avoid oxidative damage of chloroplast. In salt stress, the increased accumulation of subunits of soybean NDH complex was found to be involved in cyclic ETC (He et al. 2015) and a gene encoding the protein essential for the assembly of ATP synthase in sorghum (Sui et al. 2015) suggested the importance of cyclic ETC and photophosphorylation during the salt stress.