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| Effects of pH value on the subcellular distribution of cadmium and selective permeation of cation channels in rice seedling |
| Received:April 26, 2024 |
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| KeyWord:rice;cadmium;pH;cation channels;bioconcentration factor |
| Author Name | Affiliation | E-mail | | SHANG Ying | Tianjin Vocational College of Bioengineering, Tianjin 300462, China | | | WANG Changrong | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | wangchangrong109@163.com | | HUANG Yongchun | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Changbo | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Zhongqi | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| Rice seedlings were cultured in nutrient solution with 0.3 mg·L-1 Cd and different pH value（4.5-8.0）and the changes of Cd as well as essential elements in rice were analyzed to study the effect of rhizosphere pH on the uptake and transport efficiency of Cd in rice （Oryza sativa L.）. Experimental results showed that pH had significant effects on the growth and development of rice roots, the accumulation of Cd and essential elements. When the rhizosphere pH was 5.5, the root tips and Cd bioconcentration factor of rice roots reached the maximum. With the increase of pH in the range of 6.0-8.0, the Cd content in roots, stems and leaves of rice seedlings decreased sharply, and the decrease of Cd content in root protoplasts was significantly greater than that in cell walls. The optimum pH value for the uptake of Mn, K, Fe was 5.5, 6.0 and 6.5, for that of Mg and Ca was 7.0, and for that of Zn was 5.5-6.5, respectively. The fault tolerant rate of macro/micro-nutrient cation channels for Cd in roots and stems and leaves reached a peak successively in nutrient solution with pH 5.0-5.5. In the environment with pH>5.5, the fault tolerant rate of cation channels for Cd decreases sharply with the increase of pH. The fault tolerant rate of cation channels for Cd in stems and leaves was significantly lower than that in roots. These results indicate that increasing pH value in the range of 5.5-7.0 can raise the ability of cation channels in rice cell membrane to recognize and intercept Cd and ensure the preferential transport of essential elements, thus inhibit the uptake of Cd in plants by decreasing the fault tolerant rate of cation channels for Cd. |
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