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.

中文翻译：

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UV-B底漆对胁迫敏感性水稻幼苗的非生物胁迫耐受性的影响：底漆印记和交叉耐受性。

紫外线（B）引发可以通过激活胁迫响应途径来增强植物的非生物胁迫耐受性。本研究的主要目的是研究非生物胁迫敏感稻（Oryza sativa L.'Aiswarya'）在遭受各种非生物胁迫因素（NaCl， PEG和UV-B）。水稻种子和幼苗的UV-B引发可有效提高光合作用效率，抗氧化机制活性和抗氧化酶的产生，尤其是当幼苗暴露于NaCl中，然后再暴露于UV-B和PEG时。UV-B底漆诱导对NaCl胁迫的交叉耐受的能力被底漆和NaCl胁迫的幼苗具有更大的抗氧化活性所证实。UV-B底漆种子的幼苗具有更高的性能和胁迫耐受性，这归因于将底漆印迹从种子残留到幼苗中。的确，即使在非胁迫条件下，UV-B引发也会激活幼苗的抗氧化系统，并在随后的胁迫暴露下产生更大的响应，这表明通过在胁迫下进行UV-B引发可以做好应对即将到来的胁迫的准备。敏感大米。