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| Changes to wheat seedling root morphology in response to cadmium stress |
| Received:November 08, 2018 |
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| KeyWord:heavy metal;wheat;cadmium uptake;cadmium transport;root morphology;root average diameter |
| Author Name | Affiliation | E-mail | | WANG Xiao-jin | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | | | GAO Wei | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | gaowei_1126@163.com | | ZHAO Peng | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | zhpddy@163.com | | YU Chong-chong | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | | | LIU Hong-en | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | | | NIE Zhao-jun | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | | | QIN Shi-yu | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | | | LI Chang | College of Resources and Environment, Henan Agricultural University, Key Laboratory of Soil Pollution Prevention and Control and Remediation in Henan Province, Zhengzhou 450002, China | |
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| Abstract: |
| The current study is aimed at investigating the absorption and transport processes of cadmium (Cd) in wheat, and changes in wheat root morphology, in response to Cd treatment. A hydroponic experiment was conducted to investigate the effect of different Cd concentrations (0, 0.5, 5, 50, and 200 μmol·L-1) on wheat seedling growth and root morphology. Wheat growth was measured after 3, 6, 11, 17, and 23 d of Cd treatment, and root morphology was determined after 17 d of treatment. The results demonstrated the presence of a negative correlation between Cd uptake ability and the Cd concentration in wheat, and that maximum absorption and transport abilities were found under Cd 0.5 treatment. With increased Cd treatment concentration, wheat seedling biomass, plant height, total root length, root volume, and numbers of total root tips decreased gradually, while root average diameter increased significantly. Correlation analysis showed that seedling Cd uptake ability was positively correlated, while transport capacity was negatively related, with average root diameter. Further observation by fluorescence microscopy showed that Cd treatment could induce increased root cortical cell numbers, enlargement of parenchyma cells, and deposition of lignin in endodermal cell walls. Cd-induced increase in average root diameter may play an important role in Cd absorption and transportation in wheat. |
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