Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress
In this study, cucumber seedlings were treated with <i>Scenedesmus obliquus</i> at different concentrations (0.25, 0.50, 0.75, 1 g·L<sup>−1</sup>) under saline–alkali stress (60 mM and 90 mM). The effects of <i>Scenedesmus obliquus</i> on the repair of cucumber se...
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MDPI AG
2025-06-01
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| author | Zhao Liu Yanlong Dong Xiaoxia Jin Yan Liu Zhonghui Yue Wei Li |
| author_facet | Zhao Liu Yanlong Dong Xiaoxia Jin Yan Liu Zhonghui Yue Wei Li |
| author_sort | Zhao Liu |
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| description | In this study, cucumber seedlings were treated with <i>Scenedesmus obliquus</i> at different concentrations (0.25, 0.50, 0.75, 1 g·L<sup>−1</sup>) under saline–alkali stress (60 mM and 90 mM). The effects of <i>Scenedesmus obliquus</i> on the repair of cucumber seedlings under saline–alkali stress were explored from physiological and morphological perspectives by measuring growth physiological indices and observing microstructure. It provides a cytological basis for the development of microalgae biofertilizer. The results showed that the addition of <i>Scenedesmus obliquus</i> effectively alleviated the physiological and structural damage in cucumber seedlings caused by saline–alkali stress, with the best mitigation effect at 0.75 g·L<sup>−1</sup>. More specifically, the addition of <i>Scenedesmus obliquus</i> significantly improved seedling fresh weight and plant height under saline–alkali stress, increased stem vascular vessel diameter, thickened vessel walls, reduced structural damage, the structural recovery of mitochondria, nuclei, and other organelles in the phloem; The results showed that root xylem vessel distribution became more centralized, vessel diameter decreased, and wall thickness decreased, with other changes similar to those in the stem; The number and volume of mesophyll cells increased, chloroplast morphology recovered, and chlorophyll content rose, effectively alleviating the impact of saline–alkali stress on photosynthesis. MDA content decreased, mitigating oxidative damage caused by saline–alkali stress. |
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| issn | 2073-4395 |
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| spelling | doaj-art-3dba57bbac1340f9ab8ee5b0e191e9802025-06-25T13:20:55ZengMDPI AGAgronomy2073-43952025-06-01156146810.3390/agronomy15061468Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali StressZhao Liu0Yanlong Dong1Xiaoxia Jin2Yan Liu3Zhonghui Yue4Wei Li5College of Life Sciences and Technology, Harbin Normal University, No. 1, Shida Road, Limin Economic Development Zone, Harbin 150025, ChinaCollege of Life Sciences and Technology, Harbin Normal University, No. 1, Shida Road, Limin Economic Development Zone, Harbin 150025, ChinaCollege of Life Sciences and Technology, Harbin Normal University, No. 1, Shida Road, Limin Economic Development Zone, Harbin 150025, ChinaCollege of Life Sciences and Technology, Harbin Normal University, No. 1, Shida Road, Limin Economic Development Zone, Harbin 150025, ChinaCollege of Life Sciences and Technology, Harbin Normal University, No. 1, Shida Road, Limin Economic Development Zone, Harbin 150025, ChinaCollege of Life Sciences and Technology, Harbin Normal University, No. 1, Shida Road, Limin Economic Development Zone, Harbin 150025, ChinaIn this study, cucumber seedlings were treated with <i>Scenedesmus obliquus</i> at different concentrations (0.25, 0.50, 0.75, 1 g·L<sup>−1</sup>) under saline–alkali stress (60 mM and 90 mM). The effects of <i>Scenedesmus obliquus</i> on the repair of cucumber seedlings under saline–alkali stress were explored from physiological and morphological perspectives by measuring growth physiological indices and observing microstructure. It provides a cytological basis for the development of microalgae biofertilizer. The results showed that the addition of <i>Scenedesmus obliquus</i> effectively alleviated the physiological and structural damage in cucumber seedlings caused by saline–alkali stress, with the best mitigation effect at 0.75 g·L<sup>−1</sup>. More specifically, the addition of <i>Scenedesmus obliquus</i> significantly improved seedling fresh weight and plant height under saline–alkali stress, increased stem vascular vessel diameter, thickened vessel walls, reduced structural damage, the structural recovery of mitochondria, nuclei, and other organelles in the phloem; The results showed that root xylem vessel distribution became more centralized, vessel diameter decreased, and wall thickness decreased, with other changes similar to those in the stem; The number and volume of mesophyll cells increased, chloroplast morphology recovered, and chlorophyll content rose, effectively alleviating the impact of saline–alkali stress on photosynthesis. MDA content decreased, mitigating oxidative damage caused by saline–alkali stress.https://www.mdpi.com/2073-4395/15/6/1468<i>Scenedesmus obliquus</i>cucumbersaline–alkali stressmicrostructureultrastructure |
| spellingShingle | Zhao Liu Yanlong Dong Xiaoxia Jin Yan Liu Zhonghui Yue Wei Li Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress Agronomy <i>Scenedesmus obliquus</i> cucumber saline–alkali stress microstructure ultrastructure |
| title | Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress |
| title_full | Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress |
| title_fullStr | Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress |
| title_full_unstemmed | Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress |
| title_short | Repair Effects of <i>Scenedesmus obliquus</i> on Cucumber Seedlings Under Saline–Alkali Stress |
| title_sort | repair effects of i scenedesmus obliquus i on cucumber seedlings under saline alkali stress |
| topic | <i>Scenedesmus obliquus</i> cucumber saline–alkali stress microstructure ultrastructure |
| url | https://www.mdpi.com/2073-4395/15/6/1468 |
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