Bibliographic Details
| Title: |
硝酸盐胁迫对大花美人蕉苗期生理生化特性的影响. |
| Alternate Title: |
Effects of Nitrate Stress on Physiological and Biochemical Characteristics of Canna generalis Bailey at Seedling Stage. |
| Authors: |
谷照虎1 344029337@qq.com, 赵树鑫1, 吴文卫2, 徐慧妮1, 李昆志1 likunzhi63@126.com |
| Source: |
Guangdong Agricultural Sciences. 2024, Vol. 51 Issue 10, p53-61. 9p. |
| Subject Terms: |
*PHOTOSYNTHETIC rates, *PLANT transpiration, *PHYSIOLOGY, *PLANT-water relationships, *PHOTOSYNTHESIS |
| Abstract (English): |
【Objective】The physiological and biochemical mechanisms of Canna generalis Bailey seedlings in response to nitrate stress were studied in order to provide a basis for improving water eutrophication by planting Canna generalis Bailey. 【Method】Using Yunnan Canna generalis bailey as the material, hydroponic methods were used to study the nitrogen uptake, seedling growth, photosynthetic parameters, antioxidant enzyme activity as well as physiological and biochemical indexes of Canna generalis bailey under different nitrate nitrogen treatments.【Result】After treatment with 0 (CK), 10, 50, 100 and 150 mmol/L nitrate solutions for 5 weeks, the total nitrate uptake amounts of Canna generalis Bailey was 0, 411.7, 676.9, 554.6 and 516.4 mg/plant, the plant height increased by -0.27, 5.25, 4.25, 0.05 and -10.32 cm, and the fresh weight increased by 10.3, 32.7, 31.6, 20.3 and -11.0 g/plant, respectively. Within 5 weeks of hydroponic treatment, the photosynthesis and transpiration rates of 10 mmol/L and 50 mmol/L low concentration nitrate were significantly higher than those of the control. In the fifth week, the photosynthesis rate was about 11 and 15 times that of CK, and the transpiration rate was 4.3 and 7.5 times that of CK. Stomatal conductance and intercellular CO2 concentration remained high. The photosynthesis and transpiration rates of plants treated with 100 and 150 mmol/L nitrate solutions were at a low level, and the stomatal conductance was extremely low. The activities of SOD and CAT under 0 and 10 mmol/L treatments were relatively low, while those under 50, 100 and 150 mmol/ L treatments were significantly higher than those in the control. The activities of SOD and CAT under 50 mmol/L treatment were the highest and significantly higher than those under other treatments. POD activity was significantly higher at 50 mmol/L than that of other treatments within 5 weeks, and the lowest at 150 mmol/L, indicating that high concentration of NO3 - inhibited POD enzyme activity.【Conclusion】A lower concentration of 50 mmol/L nitrate can enhance the photosynthesis, antioxidant enzyme activity, and nitrate nitrogen absorption of Canna generalis Bailey, promoting its growth. However, a higher concentration of 100 mmol/L nitrate reduces the photosynthesis, antioxidant enzyme activity, and nitrate nitrogen absorption of Canna generalis Bailey, inhibiting its growth. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
【目的】通过研究美人蕉苗期响应硝酸盐胁迫的生理生化机制, 为种植美人蕉改善水体富营养化提 供依据。【方法】以云南大花美人蕉 (Canna generalis Bailey) 为材料, 采用水培方法研究不同浓度硝酸盐处理对 美人蕉氮素吸收、幼苗生长、光合参数、抗氧化酶活性等生理生化指标的影响。【结果】采用 0 (CK) 、10、50、 100、150 mmol/L 硝酸盐溶液水培美人蕉 5 周, 美人蕉硝态氮吸收总量分别为 0、411.7、676.9、554.6 和 516.4 mg/ 株, 株高分别增加 -0.27、5.25、4.25、0.05 和 -10.32 cm, 鲜质量分别增加 10.3、32.7、31.6、20.3 和 -11.0 g/ 株; 水培 5 周时间内, 10、50 mmol/L 两种低浓度硝酸盐培养植株的光合作用和蒸腾速率均显著高于对照, 光合作用速率分 别约为对照的 11、15 倍, 蒸腾速率是对照的 4.3、7.5 倍, 气孔导度和胞间 CO2 浓度保持较高。100、150 mmol/L 两 种高浓度硝酸盐培养植株的光合作用和蒸腾速率均处于较低水平, 气孔导度非常低。0、10 mmol/L 硝酸盐培养美人 蕉植株的 SOD、CAT 活性均较低, 而 50、100、150 mmol/L 硝酸盐处理美人蕉植株的 SOD、CAT 活性显著高于对照, 尤以 50 mmol/L 处理植株的 SOD、CAT 活性最高; 50 mmol/L 硝酸盐处理植株的 POD 活性在 5 周内均显著高于其他 处理, 而 150 mmol/L 处理最低。【结论】50 mmol/L 硝酸盐处理能提高美人蕉植株的光合作用、抗氧化酶活性和硝 态氮吸收, 促进植株生长; 而 100 mmol/L 硝酸盐处理会降低美人蕉植株的光合作用、抗氧化酶活性和硝态氮吸收, 抑制植株生长。 [ABSTRACT FROM AUTHOR] |
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