Exogenous glutathione improves high root-zone temperature tolerance by modulating photosynthesis, antioxidant and osmolytes systems in cucumber seedlings

• DOI: 10.1038/srep35424
• Publication Date: 2016-10-18T09:14:27Z
• Authors: Xiaotao Ding; Yuping Jiang; Lizhong He; Qiang Zhou; Jizhu Yu; Dafeng Hui; Danfeng Huang
• Keywords: Osmolyte; Cucumis; Malondialdehyde

Abstract To investigate the physiological responses of plants to high root-zone temperature (HT, 35 °C) stress mitigated by exogenous glutathione (GSH), cucumber ( Cucumis sativus L.) seedlings were exposed HT with or without GSH treatment for 4 days and following recovery. Plant variables, growth, gene expression related antioxidant enzymes Calvin cycle quantified. The results showed that significantly decreased content, ratio reduced oxidized (GSH/GSSG), chlorophyll photosynthesis expression, shoot height, stem diameter, as well dry weight. clearly lessened increasing above variables. Meanwhile, increased soluble protein proline malondialdehyde (MDA) content O 2 • − production rate, activities enzymes. remarkably improved activities, MDA rate compared no in condition. Our suggest enhances seedling tolerance modulating photosynthesis, osmolytes systems improve adaptation.