Sen A, Puthur J T, Challabathula D, Brestič M
Plant Physiology and Biochemistry Division, Department of Botany, University of Calicut, C.U. Campus P.O., 673635 Kerala, India.
Department of Life Sciences, School of Life Sciences, Central University of Tamil Nadu, Thiruvarur, 610004 Tamil Nadu, India.
Photosynthetica. 2022 Mar 4;60(2):219-229. doi: 10.32615/ps.2022.006. eCollection 2022.
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 F generation and re-priming in F 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 F generation further boosted the innate tolerance potential of a tolerant variety resulting in stable cellular redox homeostasis.
水稻作为世界一半以上人口的主要粮食作物，从幼苗期开始就受到干旱胁迫的严重影响。我们聚焦于耐紫外线B（UV-B）引发介导的耐旱水稻品种（Vaisakh）对聚乙二醇（PEG）6000（20%）诱导干旱的跨代耐旱性。结果表明，F代引发以及F代用UV-B再次引发增强了水稻幼苗对PEG胁迫的耐受潜力，编码抗氧化酶和胁迫相关蛋白的基因表达增加，为引发处理的植株提供了更好的保护。UV-B引发维持了植物细胞的氧化稳态，从而确保线粒体和光合作用活动不受干扰。总体而言，我们的结果表明，种子中保留的跨代引发记忆毫无损失地传递给了后代。此外，F代再次引发进一步增强了耐逆品种的固有耐受潜力，从而实现稳定的细胞氧化还原稳态。
