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Thiamin stimulates growth and secondary metabolites in turnip (Brassica rapa L.) leaf and root under drought stress. | LitMetric

AI Article Synopsis

Article Abstract

Thiamin, an important member of the vitamin B family, is believed to play a significant role in mitigating environmental stresses including drought stress. In turnip, drought stress causes a reduced growth, biomass yield, pigment content, total phenolics and ascorbic acid (AsA), particularly at 50% field capacity (F.C.) in the two cultivars (cv) studied. However, a significant enhancement was observed in the contents of leaf proline, glycinebetaine (GB), malondialdehyde (MDA), hydrogen peroxide (H O ) and the activities of catalase (CAT) and superoxide dismutase (SOD) as well as root proline, GB, total phenolics, AsA, H O , MDA and the activities of peroxidase (POD) and SOD. However, foliar-applied thiamin significantly improved (particularly 100 mM) all the growth attributes, photosynthetic pigments, leaf and root osmoprotectants (GB and proline), AsA, total phenolics and the activities of enzymatic antioxidants such as SOD and POD as well as root CAT in both turnip cultivars under drought stress conditions. Foliar application of thiamin was effective in decreasing the leaf and root H O and MDA content in both cultivars particularly at 50% F.C. Thiamin-induced growth of both turnip cultivars, particularly of cv. Purple Top, was found to be associated with increased photosynthetic pigments, proline and GB contents and antioxidant capacity, but reduced levels of reactive oxygen species (ROS) under water deficit conditions. So, it is suggested that exogenous application of thiamin can be effective in improving drought tolerance of plants.

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http://dx.doi.org/10.1111/ppl.13215DOI Listing

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