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| Effects of selenium and sulfur on antioxidants and physiological parameters of garlic plants during senescence |
| CHENG Bo, LIAN Hai-feng, LIU Ying-ying, YU Xin-hui, SUN Ya-li, SUN Xiu-dong, SHI Qing-hua, LIU Shi-qi |
1、State Key Laboratory of Crop Biology, Ministry of Science and Technology/Key Laboratory of Biology and Genetic Improvement
of Horticultural Crops (Huanghuai Region), Ministry of Agriculture/College of Horticultural Science and Engineering, Shandong
Agricultural University, Tai’an 271018, P.R.China
2、Institute of Science and Technology Information, Shandong Academy of Agricultural Sciences, Jinan 250100, P.R.China |
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摘要 A hydroponic study was conducted to determine the effects of selenium (Se: 0, 3, 6 μmol L−1) on senescence-related oxidative stress in garlic plants grown under two sulfur (S) levels. We evaluated the yields of plants harvested at 160 and 200 days after sowing. Plants grown under a low Se dose (0.3 μmol L−1) at low S level showed higher yields (12.0% increase in fresh weight yield, 13.7% increase in dry weight yield) than the controls, despite a decrease in chlorophyll concentration. Compared with control plants, the Se-treated plants showed lower levels of lipid peroxidation. The Se-treated plants also showed higher activities of glutathione peroxidase and catalase, but lower superoxide dismutase activities. Changes in Fv/Fm values and proline contents were affected more strongly by S than by Se. On the basis of our results, we can conclude that Se plays a key role in the antioxidant systems in garlic seedlings. It delays senescence by alleviating the peroxide stress, but it can be toxic at high levels. A high S level may increase tolerance to high Se concentrations through reducing Se accumulation in plants.
Abstract A hydroponic study was conducted to determine the effects of selenium (Se: 0, 3, 6 μmol L−1) on senescence-related oxidative stress in garlic plants grown under two sulfur (S) levels. We evaluated the yields of plants harvested at 160 and 200 days after sowing. Plants grown under a low Se dose (0.3 μmol L−1) at low S level showed higher yields (12.0% increase in fresh weight yield, 13.7% increase in dry weight yield) than the controls, despite a decrease in chlorophyll concentration. Compared with control plants, the Se-treated plants showed lower levels of lipid peroxidation. The Se-treated plants also showed higher activities of glutathione peroxidase and catalase, but lower superoxide dismutase activities. Changes in Fv/Fm values and proline contents were affected more strongly by S than by Se. On the basis of our results, we can conclude that Se plays a key role in the antioxidant systems in garlic seedlings. It delays senescence by alleviating the peroxide stress, but it can be toxic at high levels. A high S level may increase tolerance to high Se concentrations through reducing Se accumulation in plants.
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Received: 17 March 2015
Accepted:
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| Fund: This work was funded by the Agricultural Research Special Funds for Public Welfare Projects from the Ministry of Agriculture of the People’s Republic of China (200903018). |
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Corresponding Authors:
LIU Shi-qi, Tel: +86-538-8246818,E-mail: liusq99@sdau.edu.cn, liulucky99@163.com
E-mail: liusq99@sdau.edu.cn, liulucky99@163.com
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Cite this article:
CHENG Bo, LIAN Hai-feng, LIU Ying-ying, YU Xin-hui, SUN Ya-li, SUN Xiu-dong, SHI Qing-hua, LIU Shi-qi.
2016.
Effects of selenium and sulfur on antioxidants and physiological parameters of garlic plants during senescence. Journal of Integrative Agriculture, 15(3): 566-572.
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