Low pH altered salt stress in antioxidant metabolism and nitrogen assimilation in ginger (Zingiber officinale) seedlings |
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Authors: | Fengman Yin Xuena Liu Bili Cao Kun Xu |
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Institution: | 1. College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018 China
Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, Tai'an, 271018 China
Key Laboratory of Biology and Genetic Improvement of Horticultural Crops in Huanghuai Region, Ministry of Agriculture and Rural Affairs, Tai'an, 271018 China
State Key Laboratory of Crop Biology, Tai'an, 271018 China;2. College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018 China |
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Abstract: | The effects of low pH on antioxidant metabolism and nitrogen (N) assimilation in ginger seedlings under salt stress were investigated. A two-way randomized block design was used: the main treatment consisted of two pH levels, normal and low pH (6.0 and 4.0, respectively), and the other treatment consisted of two salinity levels, 0 and 100 mmol l?1 Na+ (NaCl and Na2SO4). The results showed that low pH decreased the malondialdehyde (MDA) and hydrogen peroxide contents of ginger seedling leaves under salt stress. Moreover, low pH and salt stress significantly decreased the contents of non-enzymatic antioxidants, including ascorbate (AsA) and glutathione (GSH), and increased the activities of antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR) and glutathione reductase (GR). In addition, salt stress inhibited the N assimilation process in ginger seedling leaves, but low pH improved N assimilation under salt stress. Our finding was that low pH alleviated oxidative damage and promoted N assimilation under salt stress. |
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