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首页> 外文期刊>Frontiers in Plant Science >Physiological and Biochemical Mechanisms of Seed Priming-Induced Chilling Tolerance in Rice Cultivars
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Physiological and Biochemical Mechanisms of Seed Priming-Induced Chilling Tolerance in Rice Cultivars

机译：水稻品种引发种子引发的耐冷性的生理生化机制

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Rice belongs to tropical and subtropical environments and is extremely sensitive to chilling stress particularly during emergence and early stages of seedling development. Seed priming can be a good approach to enhance rice germination and stand establishment under chilling stress. The present study examined the role of different seed priming techniques viz., hydropriming, osmopriming, redox priming, chemical priming, and hormonal priming, in enhancing the chilling tolerance in rice. The most effective reagents and their pre-optimized concentrations based on preliminary experiments were used in this study. Two different rice cultivars were sown under chilling stress (18°C) and normal temperatures (28°C) in separate growth chambers. A non-primed control treatment was also maintained for comparison. Chilling stress caused erratic and delayed germination, poor seedling growth, reduced starch metabolism, and lower respiration rate, while higher lipid peroxidation and hydrogen peroxide accumulation in rice seedlings of both cultivars. Nevertheless, all the seed priming treatments effectively alleviated the negative effects of chilling stress. In addition, seed priming treatments triggered the activities of superoxide dismutase, peroxidase, and catalase, and enhanced the accumulations of glutathione and free proline in rice seedlings, which suggests that these measures help prevent the rice seedlings from chilling induced oxidative stress. Chemical priming with selenium and hormonal priming with salicylic acid remained more effective treatments for both rice cultivars under chilling stress than all other priming treatments. The better performance and greater tolerance of primed rice seedlings was associated with enhanced starch metabolism, high respiration rate, lower lipid peroxidation, and strong antioxidative defense system under chilling stress.
机译：水稻属于热带和亚热带环境，对低温胁迫极为敏感，特别是在出苗和幼苗发育的早期。引发种子可能是增强水稻发芽和在寒冷胁迫下建立林分的好方法。本研究研究了不同的种子引发技术，即水力引发，渗透压，氧化还原引发，化学引发和激素引发，在增强水稻的耐冷性中的作用。在这项研究中使用了基于初步实验的最有效试剂及其预先优化的浓度。在不同的生长室中，在低温（18°C）和常温（28°C）下播种两种不同的水稻品种。还保留了未涂底漆的对照治疗以进行比较。低温胁迫导致两个品种的水稻幼苗发芽不稳定和延迟发芽，幼苗生长不良，淀粉代谢降低和呼吸速率降低，同时脂质过氧化和过氧化氢积累较高。然而，所有的种子引发处理都有效地减轻了低温胁迫的负面影响。此外，种子引发处理触发了水稻幼苗中的超氧化物歧化酶，过氧化物酶和过氧化氢酶的活性，并增加了谷胱甘肽和游离脯氨酸的积累，这表明这些措施有助于防止水稻幼苗过冷引起氧化应激。与低温处理相比，用硒进行化学处理和利用水杨酸进行激素处理对两个水稻品种仍然是更有效的处理方法。优质稻苗的更好性能和耐受性与增强的淀粉代谢，较高的呼吸速率，较低的脂质过氧化作用和低温胁迫下强大的抗氧化防御系统有关。

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