| Cite this article: | 陈碧华,郭卫丽,孟凡茹,等.镉胁迫对南瓜植株镉吸收积累及光合特性影响[J].灌溉排水学报,2020,(12):-. |
| 陈碧华,Guo weili,Meng fanru,et al.镉胁迫对南瓜植株镉吸收积累及光合特性影响[J].灌溉排水学报,2020,(12):-. |
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| Effects of Cadmium Stress on Cadmium Uptake Accumulation and Photosynthetic Characteristics of Pumpkin Plants |
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陈碧华, Guo weili, Meng fanru, Zhou junguo, Li xinzheng
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Henan Institute of Science and Technology
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| Abstract: |
| 【Objective】 In order to study the absorption and accumulation characteristics of cadmium in pumpkin plants and the effect of cadmium stress on photosynthesis of pumpkin leaves. 【Methods】Using microwave digestion-ICP-AES technology and the Chinese pumpkin "Yanzhen 1" as experimental material. Substrate cultivation experiment with four cadmium stress concentrations of 0, 2, 4, 6 mg.L-1. The photosynthetic parameters of leaves, the sub-cellular distribution of Cd and the distribution of organs (roots, stems and leaves) were determined during growth.【Results】The results showed that the content of Cd in pumpkin root increased much more than that of stem and leaf. With the increase of Cd concentration, the BCF value of root enrichment factor increased and the TF value of transport coefficient decreased gradually. Cd was unevenly distributed among the subcellular components of different organs. The distribution rate of cell wall in roots was up to 47.63%~57.69%, followed by cytoplasm; Cd content in organelles only accounted for 1.93%~4.59%. Cd treatment did not significantly inhibit the net photosynthetic rate (Pn) of pumpkin, while Cd treatment significantly inhibited stomatal conductance (Gs) and transpiration rate (Tr), but there was no significant difference in intercellular CO2 concentration (Ci) between Cd treatment. 【Conclusion】Under the cadmium stress, the Chinese pumpkin “Yanzhen 1” could enrich Cd in the cell wall of the root system, and its ability to transfer from the root to the stem and leaves is weakened, which does not cause significant inhibition on photosynthesis. |
| Key words: Cadmium Stress; Pumpkin;subcellular disposition;photosynthetic;concentration factor; Transfer Factor |
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