Plants are exposed to various abiotic stresses and there exists sophisticated mechanisms within them for tolerating these stresses. The present study clearly revealed the efficacy of UV-B priming at both seed and seedling stage in tolerant (Kanchana) and sensitive (Aiswarya) rice varieties, to tolerate UV-B stress, polyethylene glycol-6000 (PEG) and NaCl stresses. Increase in UV stress specific characters such as accumulation of UV absorbing compounds [flavonoids (242–368%) and anthocyanin (367–386%) content],increased activity of phenylalanine ammonia lyase (116–210%) and increased leaf cuticular wax content (382–403%) was observed in UV-B primed seedlings of rice subjected to UV-B, NaCl and PEG stresses. The increase in the levels shown as percent increase were highest in seedlings subjected to UV-B stress followed by NaCl and PEG stresses. The influence of priming imprints was more effective in seeds and seedlings of the tolerant rice variety (Kanchana) than the sensitive variety (Aiswarya). Functional groups variation in wax content was more prominent in PEG stress conditions than UV-B and NaCl stresses and it was mainly observed in Aiswarya than in Kanchana. Additionally our results suggests the UV-priming mediated enhancement of the stress tolerance potential of a tolerant variety seems to be more successful than the sensitive variety.

中文翻译：

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UV-B 引发增强水稻 (L.) 中的特定次生代谢物，使其能够应对各种非生物胁迫

植物暴露于各种非生物胁迫下，并且在它们内部存在耐受这些胁迫的复杂机制。本研究清楚地揭示了在耐性（Kanchana）和敏感（Aiswarya）水稻品种的种子和幼苗阶段 UV-B 引发对 UV-B 胁迫、聚乙二醇 6000 (PEG) 和 NaCl 胁迫的耐受效果。紫外线胁迫特定特征的增加，例如紫外线吸收化合物的积累 [类黄酮 (242–368%) 和花青素 (367–386%) 含量]、苯丙氨酸解氨酶活性增加 (116–210%) 和叶表皮蜡含量增加(382–403%) 在受到 UV-B、NaCl 和 PEG 胁迫的水稻的 UV-B 引发的幼苗中观察到。在经受 UV-B 胁迫的幼苗中，显示为百分比增加的水平增加最高，其次是 NaCl 和 PEG 胁迫。引发印记的影响在耐受水稻品种 (Kanchana) 的种子和幼苗中比敏感品种 (Aiswarya) 更有效。在 PEG 胁迫条件下，蜡含量的官能团变化比 UV-B 和 NaCl 胁迫更显着，主要在 Aiswarya 中观察到，而不是在 Kanchana 中观察到。此外，我们的结果表明，紫外线引发介导的耐受品种胁迫耐受潜力的增强似乎比敏感品种更成功。