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Fluoroquinolone antibiotics（FQs） are widely detected in agricultural irrigation water，livestock wastewater，and coastal wetlands，posing potential stress to plant growth and ecological processes. Taking ofloxacin（OFX） and enrofloxacin（ENR） as representative compounds，this study employed physiological and biochemical assays in combination with transcriptomic analysis to systematically elucidate the physiological responses and molecular regulatory mechanisms of Suaeda salsa under FQs stress. The results showed that both OFX and ENR induced significant oxidative stress in both the aboveground and belowground parts of S. salsa. Comparatively，ENR caused more pronounced lipid peroxidation，which was accompanied by the significant differential expression of genes related to phenylpropanoid metabolism and ABC（ATP-binding cassette） transporters. In contrast，OFX stress primarily impaired photosystem structure and function，while simultaneously enhancing antioxidant defense through the regulation of the WRKY transcription factor family and MAPK（mitogen-activated protein kinase） signaling pathways. Furthermore，both antibiotic treatments promoted the glycolysis-pyruvate metabolism pathway，thereby providing sustained energy supply and reducing power to support stress resistance. Collectively，under FQs stress，S. salsa exhibited a multi-level adaptive response strategy driven by the coordinated regulation of structural defense，metabolic reprogramming，and signaling pathways.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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