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| Effects of methyl jasmonate on the growth and cadmium accumulation of wheat seedlings |
| Received:November 08, 2021 |
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| KeyWord:heavy metal;cadmium;methyl jasmonate(MeJA);photosynthesis;root morphology;cadmium speciation |
| Author Name | Affiliation | E-mail | | FENG Wenjing | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | GAO Wei | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | gaowei_1126@163.com | | SUN Miaomiao | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | ZHAO Peng | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | zhpddy@163.com | | KANG Guozhang | College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China | | | LIU Hongen | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | QIN Shiyu | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | LI Chang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | SUI Fuqing | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | |
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| Abstract: |
| In order to explore the function and mechanism of methyl jasmonate（MeJA）on the growth and cadmium（Cd）accumulation of wheat seedlings under Cd stress, a hydroponic experiment with foliar spraying hormone was conducted. This experiment studied the effects of MeJA（1 μmol·L-1 and 100 μmol·L-1）on the dry matter accumulation, Cd concentration, root morphology, photosynthetic parameter characteristics, and Cd chemical speciation. Compared with the control group, 1 μmol · L-1 MeJA significantly increased the biomass of wheat seedlings by 15%~30%, and reduced the Cd concentration in the whole plant by 14%~43%. The treatment also increased root length, root surface area, root volume, net photosynthetic rate, stomatal conductance, and transpiration rate of the wheat seedlings, but reduced intercellular CO2 content. In addition, 1 μmol·L-1 MeJA significantly reduced the proportions of ionic Cd and organic acid-Cd in the roots, and increased the proportion of insoluble Cd oxalate and pectate/protein integrated Cd. It can be concluded that foliar spraying of MeJA can reduce Cd concentrations in seedlings through the inhibition of root Cd uptake ability and the enhancement of dry matter accumulation. It can also alleviate the toxicity of Cd through the improvement of transformation from active-Cd to unactive-Cd. |
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