Rice being the major food crop for more than half of the world population is severely affected by drought stress starting from the establishment of the seedling. We focused on the UV-B priming mediated transgenerational drought tolerance of a drought-tolerant rice variety (Vaisakh) towards polyethylene glycol (PEG) 6,000 (20%)-induced drought. Results showed that priming in F0 generation and re-priming in F1 generation with UV-B enhanced the PEG stress tolerance potential of rice seedlings with increased expression of genes encoding antioxidant enzymes and stress-related proteins offering better protection to primed plants. UV-B priming maintained oxidative homeostasis of the plant cell thus ensuring uninterrupted mitochondrial and photosynthetic activities. Cumulatively, our results suggest that the transgenerational priming memory retained in the seeds is transferred to offspring without any loss. Moreover, re-priming in F1 generation further boosted the innate tolerance potential of a tolerant variety resulting in stable cellular redox homeostasis.

Department of Botany and Plant Physiology Faculty of Agrobiology Food and Natural Resources Czech University of Life Sciences 16500 Prague Czech Republic

Department of Life Sciences School of Life Sciences Central University of Tamil Nadu Thiruvarur 610004 Tamil Nadu India

Department of Plant Physiology Slovak University of Agriculture Nitra Slovak Republic

Plant Physiology and Biochemistry Division Department of Botany University of Calicut C U Campus P O 673635 Kerala India

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