| Analysis of physiological response characteristics of Lycium ruthenicum to wind\|sand stress |
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| DOI：10.7606/j.issn.1000-7601.2025.06.05 |
| Key Words: Lycium ruthenicum wind\|sand stress photosynthetic physiology antioxidant enzyme relative water content northwest region |
| Author Name | Affiliation | | HAN Dongchen | Department of Life Sciences, Linfen Vocational and Technical College, Linfen, Shanxi 041000, China | | CHEN Wei | College of Life Sciences, Shanxi Normal University, Taiyuan, Shanxi 030031, China | | NIU Xinyue | College of Life Sciences, Shanxi Normal University, Taiyuan, Shanxi 030031, China |
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| Abstract: |
| In order to explore the physiological response characteristics of Lycium ruthenicum to wind\|sand stress, L. ruthenicum seedlings from Qingtu Lake Area, Minqin, Gansu Province, were selected for the study. The stress of clean wind and wind\|sand flow was simulated in the wind tunnel laboratory, and the photosynthetic physiological indicators, antioxidant enzyme activities, contents of osmotic regulatory substances, degree of membrane lipid peroxidation, and leaf stomatal indicators were determined. The results showed that under clean air stress, Pn, Gs, Ci, and Tr reach their peaks at 12 m·s-1, which are 38.3 μmol·m-2·s-1, 0.48 mol·m-2·s-1, 8.01 μmol·mol-1 and 8.2 mmol·m-2·s-1, respectively. The SOD activity reached a peak of 42.3 U·g-1 at 5 m·s-1, and the POD activity reached a peak of 39.6 U·g-1·min-1 at 15 m·s-1. The CAT activity reached a peak of 9.1 U·g-1·min-1 at 12 m·s-1 under clean air stress, the proline content reached a peak of 207 μg·g-1 at 12 m·s-1 under clean air stress, and the MDA content reached a peak of 7.6 nmol·g-1 at 12 m·s-1 under clean air stress. The stomatal density of the upper epidermis reached a peak of 5 216 PCS·mm-2 at 5 m·s-1, and that of the lower epidermis reached a peak of 3 368 PCS·mm-2 at 12 m·s-1. Under the stress of wind\|sand flow, Pn, Gs, Ci, and Tr increased with the increase of stress time and reached the peak at 24 minutes. They were 19.1 μmol·m-2·s-1, 0.95 mol·m-2·s-1, 16.3 μmol·mol-1, and 17.7 mmol·m-2·s-1, respectively. The SOD activity reached a peak of 36.2 U·g-1 at 8 min. The POD activity reached a peak of 65.6 U·g-1·min-1 at 12 m·s-1. The CAT activity reached the peak of 10.8 U·g-1·min-1 at 8 min. The proline content reached a peak of 231 μg·g-1 at 16 min. The content of soluble sugar reached a peak of 8.0 mg·g-1 at 12 m·s-1. The MDA content reached a peak of 9.4 nmol·g-1 at 8 m·s-1. The stomatal density of the upper epidermis reached a peak of 3 986 PCS·mm-2 at 5 m·s-1, and that of the lower epidermis reached a peak of 4 581 PCS·mm-2 at 12 m·s-1. The research results showed that the physiological response characteristics of L. ruthenicum to wind\|sand stress are significantly dependent on wind speed and stress time. Plants adapt to wind\|sand stress of different intensities and durations by dynamically regulating physiological processes such as photosynthetic physiology, antioxidant enzyme activity, osmotic regulatory substance content, and stomatal indicators. |
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