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Applicant:
Central University of Tamil Nadu 
Author:
Challabathula Dinakar 
Corresponding Authors:
Jos T. Puthur 
DOI #:
10.1016/j.plaphy.2019.12.002 
Title:
Effect of UV-B priming on the abiotic stress tolerance of stress-sensitive rice seedlings: Priming imprints and cross-tolerance 
Journal:
Plant Physiology and Biochemistry 
Year:
2020 
Volume:
147 
Page:
21 
Keywords:
Antioxidants; Cross-tolerance; Photosynthesis; Priming imprints; Reactive oxygen species; Seed priming; Seedling priming; UV-B. 
Abstract:
Ultraviolet (UV)-B priming can boost the abiotic stress tolerance of plants by activating stress-responsive pathways. The main objective of the present study was to investigate the persistence of priming imprints and cross-tolerance inducing effects of UV-B priming in abiotic stress-sensitive rice (Oryza sativa L. 'Aiswarya') when subjected to various abiotic stressors (NaCl, PEG, and UV-B). The UV-B priming of rice seeds and seedlings effectively enhanced photosynthetic efficiency, antioxidant machinery activity, and antioxidative enzyme production, especially when seedlings were exposed to NaCl, followed by UV-B and PEG. The ability of UV-B priming to induce cross-tolerance against NaCl stress was substantiated by the greater antioxidant activity of the primed and NaCl-stressed seedlings. The greater performance and stress tolerance of the seedlings from UV-B-primed seeds were attributed to the carryover of priming imprints from seeds into the seedlings. Indeed, UV-B priming activated the antioxidant systems of the seedlings, even under non-stress conditions, and resulted in greater responses upon subsequent stress exposure, which suggested that preparedness for encountering imminent stress was attained by UV-B priming in a stress-sensitive rice. 
Entered by:
DINAKAR Challabathula on 2020-09-04 
 
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