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| FTIR-NIR Spectrum Study on Response and Mechanism of Broussonetia papyrifera Sprout Under Cadmium Stresses |
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| KeyWord:infrared spectrum; Broussonetia papyrifera; Cd stress; physiological action; chlorophyll; chemical components |
| Author Name | Affiliation | | WANG Cheng | Nanjing Research Institute of Environmental Protection, Nanjing 210013, China
Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China | | JIANG Ze-ping | Forestry Academy of Jiangsu Province, Nanjing 210018, China | | LI Wen-qing | Nanjing Research Institute of Environmental Protection, Nanjing 210013, China | | SHAO Wen-jing | Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China | | ZHANG Ting | Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China | | JI Jun-feng | Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China |
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| Abstract: |
| Broussonetia papyrifera, a popular tree in China, is tolerant to barren and drought soil conditions. It is also potential pollution-resistant. In this study, Fourrier Transform Infrared Spectrometry（FTIR） and Near Infrared Spectrum（NIR） were applied to study the dynamics of protein and other organic components in test-tube Broussonetia papyrifera sprout under different Cd stresses. Chlorophyll contents in Broussonetia papyrifera sprout leaves were also analyzed. Cadmium concentrations in sprout leaves increased, but chlorophyll contents decreased with increasing Cd stresses. Under Cd stresses, The red edge position in fresh leaves of Broussonetia papyrifera sprout exhibited “blue-shift”, and the degree of the“blue-shift” showed a significant correlation with chlorophyll concentration. The red edge position of wavelength 710 nm in NIR can be used as an indicator of plant pollution by Cd. The intensities of absorption peaks 3010 cm-1, 1720 cm-1, 1636 cm-1, 1468 cm-1 and 892 cm-1 in FTIR increased with Cd stresses, implying that Broussonetia papyrifera sprout synthesized more protein, polysaccharide, ester and other organic components under Cd stresses. FTIR-NIR is a useful technique to study the mechanisms of plant responses to heavy metal stress and is also a potentially quick method for monitoring plant heavy metal pollution. |
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