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Abstract
It is well established that small heat shock proteins (sHSPs) play an important role in thermotolerance in various organisms due to their abundance and diversity. In the present study, a chloroplast small heat shock protein gene (LeHSP21) from tomato (Lycopersicon esculentum cv PKM-1) was constitutively expressed in tobacco (Nicotiana tabacum L. cv Wisconsin 38) plants via Agrobacterium-mediated transformation. When compared to wild-type control plants, transgenic tobacco plants constitutively expressing LeHSP21, driven by the cauliflower mosaic virus 35S promoter, exhibited improved tolerance to both high temperature and oxidative stress. Furthermore, when the seedlings were subjected to high temperature treatment, the activities of anti-oxidative enzymes and the content of proline were significantly higher in transgenic plants than those in the wild-type plants. Our results presented here demonstrate the feasibility of improving high temperature and oxidative stress tolerance in plants through the expression of LeHSP21 gene.
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