Enhanced photosynthetic capacity and antioxidant potential mediate brassinosteriod-induced phenanthrene stress tolerance in tomato
文献类型: 外文期刊
作者: Ahammed, Golam Jalal;Li, Xin;Xia, Xiao-Jian;Shi, Kai;Zhou, Yan-Hong;Yu, Jing-Quan;Li, Xin;Yu, Jing-Quan
作者机构:
关键词: Airborne pollutant;Antioxidant enzyme;Brassinosteroids;Photosynthesis;Reactive oxygen species
期刊名称: ENVIRONMENTAL POLLUTION
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年卷期:
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收录情况: SCI
摘要: Photosynthesis, the basal manufacturing process in the earth is habitually restricted by airborne micropollutants such as phenanthrene (PHE). Here, we show that 24-epibrassinolide (EBR), a bioactive plant steroid is able to keep higher photosynthetic capacity consistently for a long period under a shoot-imposed PHE stress in tomato. EBR-promoted photosynthetic capacity and efficiency eventually resulted in a 37.5% increase of biomass under PHE stress. As primary response, transcripts of antioxidant genes were remarkably induced by EBR in PHE-treated plants. Activities of antioxidant and detoxification enzymes were also enhanced by EBR. Notably, EBR-induced higher antioxidant potential was associated with reduced levels of H2O2 and O-2(center dot-), resulting in a 32.7% decrease of content of malondialdehyde in the end of experiment and relatively healthy chloroplast ultrastructure in EBR + PHE treatment compared with PHE alone. These results indicate that EBR alleviates shoot-imposed PHE phytotoxicity by maintaining a consistently higher photosynthetic capacity and antioxidant potential in tomato. (C) 2015 Elsevier Ltd. All rights reserved.
分类号: X5
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