Physiological and biochemical responses of tea seedlings (Camellia sinensis) to simulated acid rain conditions
| Autor: | Xiaoqin Yi, Chenyu Zhang, Minhan Wang, Zhidong Lv, Xizhi Gao, Jianjiao Chen, Chenyu Shao, Chengwen Shen, Zhonghua Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Antioxidant
Nitrogen Health Toxicology and Mutagenesis medicine.medical_treatment 0211 other engineering and technologies Acid Rain 02 engineering and technology Photosynthetic pigment 010501 environmental sciences Photosynthesis 01 natural sciences Antioxidants Camellia sinensis Catechin chemistry.chemical_compound Ascorbate Peroxidases Caffeine Malondialdehyde medicine Food science Proline Amino Acids 0105 earth and related environmental sciences 021110 strategic defence & security studies biology Public Health Environmental and Occupational Health food and beverages General Medicine Catalase Theanine Pollution Plant Leaves Oxidative Stress chemistry Seedlings biology.protein |
| Zdroj: | Ecotoxicology and Environmental Safety. 192:110315 |
| ISSN: | 0147-6513 |
| Popis: | Tea (Camellia sinensis), widely planted in the south of China, and often exposed to acid rain. However, research concerning the impacts of acid rain on physiology and biochemistry of tea plants is still scarce. In this study, we investigated the influence of simulated acid rain (SAR) on plant height, root length, photosynthetic pigment, Fv/Fm, proline, malondialdehyde, antioxidant enzyme activity, total nitrogen, caffeine, catechins, and free amino acids. Our results showed that SAR at pH 4.5 did not hinder plant development because growth characteristics, photosynthesis, and ascorbate peroxidase and catalase activities did not decrease at this pH compared to those at the other investigated pH values. However, at pH 3.5 and pH 2.5, the activities of antioxidase and concentrations of malondialdehyde and proline increased significantly in response to the decrease of photosynthetic pigments and Fv/Fm. In addition, the increase in acidity increased total nitrogen, certain amino acid content (theanine, cysteine), and decreased catechin and caffeine contents, resulting in an imbalance of the carbon and nitrogen metabolisms. Our results indicated that SAR at pH 3.5 and pH 2.5 could restrict photosynthesis and the antioxidant defense system, causing metabolic disorders and ultimately affecting plant development and growth, but SAR at pH 4.5 had no toxic effects on tea seedlings when no other stress factors are involved. |
| Databáze: | OpenAIRE |
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