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| Effects of Pb, Cd, and acid stress on seed germination, seedling growth, and antioxidant enzyme activities of Liquidambar formosana |
| Received:September 29, 2017 |
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| KeyWord:ion-type rare earth ore;Liquidambar formosana;seeds;germination mechanism;antioxidant enzyme activities |
| Author Name | Affiliation | E-mail | | CHEN Shun-yu | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | HAN Hang | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | XUE Ling-yun | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHANG Yun | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | HOU Xiao-long | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Co-innovation Center for Soil and Water Conservation in Red Soil Region of the Cross-straits, Fuzhou 350002, China
College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | xl.hou@fafu.edu.cn | | CAI Li-ping | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Co-innovation Center for Soil and Water Conservation in Red Soil Region of the Cross-straits, Fuzhou 350002, China | | | ZHOU Chui-fan | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Co-innovation Center for Soil and Water Conservation in Red Soil Region of the Cross-straits, Fuzhou 350002, China | |
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| Abstract: |
| Soil acidification and heavy metal pollution are two major limiting factors of the ecological restoration of ionic-rare abandoned land. Some special morphological and physiological mechanisms may exist in Liquidambar formosana Hance owing to its strong adaptation to ionic-rare abandoned land in Changting, Fujian. A controlled artificial climate experiment chest was applied to explore the response strategy of Liquidambar formosana to Pb, Cd, and pH stress. The stress treatments were conducted in triplicate. Seed germination status, growth of seedlings, and antioxidant enzyme activity were measured. The results showed that there was no significant difference for seed germination(P>0.05), but the growth of seedlings significantly decreased(P<0.05) under Pb and Cd stress. Superoxide dismutase(SOD) activity,peroxidase(POD) activity of the tenth day and catalase(CAT) activity of the fourth and seventh day changed polynomial,showing a trend of decrease after increase,and then rising up again at the second inflexion, The activities of CAT and SOD significantly improved with the increase of Cd concentration. POD activity was inhibited in the early stage of germination(4 d) but significantly increased with enhanced stress in the late stage. The pH levels of 4.5 and 5.5 had a promotion effect on the germination index and growth of seedlings. With the decrease of soil pH, POD activity of the seventh day increased significantly, and the POD and CAT activities of the tenth day improved obviously. With stress time increased, the results indicated that under strong acidic conditions, the activity of POD was increased and the oxidative damage of H2O2 to the cells was eliminated in the middle stage of germination. The malonaldehyde(MDA) contents had an increasing trend, with those of the un-germinated seeds significantly(P<0.05) higher than those of the germinated seeds, indicating that the membrane lipid peroxidation got serious. To sum up, CAT activity was the main response strategy of Liquidambar formosana to Pb, Cd, and acid stress. SOD activity played an important role in the adaptation of Liquidambar formosana to Cd stress, as did POD activities for Pb and acid stress. |
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