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| Lead stress response mechanisms of wheat seedlings with different phosphorus efficiencies |
| Received:November 29, 2021 |
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| KeyWord:phosphorus efficiency;wheat;lead;root diameter;antioxidase |
| Author Name | Affiliation | E-mail | | SUN Qizhuang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | WANG Long | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | hnndwanglong@163.com | | MA Yanfang | Forestry Seed Introduction and Promotion Centre of Anyang, Anyang 455000, China | | | HUANG Shaomin | Institute of Plant Nutrient and Environmental Resources, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China | | | LIU Hongen | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | GAO Wei | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | LI Chang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | ZHANG Wenwen | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | ZHAO Peng | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | zhpddy@163.com |
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| Abstract: |
| To clarify the response mechanisms of wheat varieties with different phosphorus efficiencies to lead(Pb)stress, the study comprehensively analyzed root morphology, photosynthetic pigment contents, Pb and P uptake and translocation, and the interrelationship of wheat seedling antioxidant systems with different phosphorus efficiencies under Pb treatment(0, 0.05, 0.10, 0.50, 1.00, 2.50 mmol·L-1, and 5.00 mmol·L-1)using the solution incubation method. The results show that the biomass, root length, root surface area, number of root tips, photosynthetic pigment contents, and soluble protein contents of wheat seedlings with different phosphorus efficiencies significantly increased at low Pb concentrations(<0.10 mmol · L-1). At high Pb concentrations(≥ 0.50 mmol · L-1), the root length, root surface area, number of root tips, photosynthetic pigment contents, and soluble protein contents dramatically decreased, whereas the root diameter, antioxidase(SOD, POD, and CAT)activity, and MDA content were significantly increased compared to the control. The Pb content in the wheat shoots and roots significantly increased as Pb concentration increased, and the Pb content of roots in the wheat varieties with low phosphorus efficiency levels was 2.04 times higher than that of the highly phosphorus-efficient wheat varieties. In contrast, the shoots in the highly phosphorus-efficient wheat varieties was 2.48 times higher than that of less phosphorus-efficient varieties. Correlation analysis indicates that the Pb content in roots and shoots was significantly negatively correlated(P<0.01)with root length, root surface area, number of root tips, root soluble protein, and cell membrane permeability, and was significantly positively correlated(P<0.01)with root diameter and antioxidant activity(SOD, POD, and CAT), indicating that wheat reduces the uptake and translocation of Pb by reducing root length, root surface area, and number of root tips, as well as increasing root diameter and antioxidant enzyme activity. In addition, the roots of the less phosphorus-efficient varieties showed high uptake but low translocation of Pb, while highly phosphorus-efficient varieties had low uptake but high translocation rates of Pb. Compared to the less phosphorus-efficient varieties, the roots of the highly phosphorus-efficient varieties were thicker in diameter, had higher Pb transport efficiency, and were more tolerant of Pb stress. |
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