| Physiological characteristics of salt tolerance and nitrogen accumulation in seedlings of different drought\|tolerant and alkali\|tolerant wheat varieties under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2026.03.03 |
| Key Words: drought\|tolerant and alkali\|tolerant wheat varieties salt tolerance physiological characteristics nitrogen accumulation salt stress |
| Author Name | Affiliation | | LIU Ruiyi | State Key Laboratory of North China Crop Improvement and Regulation, Baoding, Hebei 071001, China
College of Resources & Environmental Sciences, Hebei Agricultural University, Baoding, Hebei 071001, China
Key Laboratory for Farmland Eco\|environment of Hebei Province, Baoding, Hebei 071001, China | | WANG Xiaomin | State Key Laboratory of North China Crop Improvement and Regulation, Baoding, Hebei 071001, China
College of Resources & Environmental Sciences, Hebei Agricultural University, Baoding, Hebei 071001, China
Key Laboratory for Farmland Eco\|environment of Hebei Province, Baoding, Hebei 071001, China | | JI Yanzhi | College of Resources & Environmental Sciences, Hebei Agricultural University, Baoding, Hebei 071001, China
Key Laboratory for Farmland Eco\|environment of Hebei Province, Baoding, Hebei 071001, China | | LI Jinjin | College of Resources & Environmental Sciences, Hebei Agricultural University, Baoding, Hebei 071001, China
Key Laboratory for Farmland Eco\|environment of Hebei Province, Baoding, Hebei 071001, China | | HAN Yuge | College of Resources & Environmental Sciences, Hebei Agricultural University, Baoding, Hebei 071001, China
Key Laboratory for Farmland Eco\|environment of Hebei Province, Baoding, Hebei 071001, China | | GUO Yanjie | State Key Laboratory of North China Crop Improvement and Regulation, Baoding, Hebei 071001, China
College of Resources & Environmental Sciences, Hebei Agricultural University, Baoding, Hebei 071001, China
Key Laboratory for Farmland Eco\|environment of Hebei Province, Baoding, Hebei 071001, China |
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| Abstract: |
| Six drought\|tolerant and alkali\|tolerant wheat varieties widely applied in saline farmlands (‘Cangmai 15’, ‘Cangmai 12’, ‘Jiemai 19’, ‘Cangmai 6002’, ‘Hannong 1412’, and ‘Henong 9204’) were evaluated under hydroponic conditions. Four salinity levels (0, 40, 80, and 120 mmol·L-1 NaCl) were used to simulate non\|saline, mild, moderate, and severe salt stress environments, with a consistent nitrogen supply (5 mmol·L-1 urea), to systematically analyze the physiological responses and nitrogen accumulation characteristics of different cultivars under salt stress. The results showed that the physiological responses of different wheat cultivars were significantly different with the increase of salt stress level. Under 40 mmol·L-1 NaCl, the germination vigor of ‘Cangmai 12’ increased significantly by 19.15% compared to CK (0 mmol·L-1 NaCl treatment). Its root length increased significantly by 88.87% and 29.13% under 40 mmol·L-1 and 80 mmol·L-1 salt stress, respectively, with fresh weight increased by 15.38% (P<0.05). Plant height of ‘Cangmai 15’ increased by 3.58% under 40 mmol·L-1 NaCl. Cultivars also exhibited distinct physiological thresholds to salinity. The SPAD values of ‘Cangmai 15’ increased by 4.85%-9.71% across all salt levels, and its shoot K+/Na+ ratio was significantly higher than that of the other cultivars under 40 mmol·L-1 NaCl. ‘Cangmai 12’ exhibited higher shoot K+/Na+ ratios than the other cultivars under 80 and 120 mmol·L-1 NaCl. In contrast, ‘Henong 9204’ had the highest root K+/Na+ ratio under 40 mmol·L-1 NaCl. In terms of plant osmotic regulation, under 40 mmol·L-1 salt stress, the free proline content of ‘Cangmai 12’ was 2.14 times that of the CK, while under 80 mmol·L-1 and 120 mmol·L-1 salt stress, the free proline content of ‘Hannong 1412’ was 12.00 times and 28.77 times that of CK, respectively. Although nitrogen uptake was suppressed under salt stress, both ‘Cangmai 15’ and ‘Cangmai 12’ exhibited significantly higher nitrogen use efficiency under 40 mmol·L-1 NaCl salt stress, showing significant increases of 13.59% and 9.29% compared to CK, respectively (P<0.05). Overall, the salt tolerance and nitrogen use efficiency of the six drought\|tolerant and alkali\|tolerant wheat varieties ranked as follows: ‘Cangmai 12’>‘Cangmai 15’>‘Cangmai 6002’>‘Henong 9204’>‘Hannong 1412’>‘Jiemai 19’. |
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