Background

High soil salinity can cause significant losses in rice productivity worldwide, mainly because salt inhibits plant growth and reduces grain yield. To cope with environmental changes, plants have evolved several adaptive mechanisms that involve the regulation of many stress-responsive genes.

Results

In this study, we identified OsSTAP1, which encodes an AP2/ERF-type transcription factor, was rapidly induced by ABA, ACC, salt, cold, and PEG treatments. OsSTAP1 is localized to the nucleus and acts as a transcriptional activator in plant cells. Compared with wild type, transgenic lines overexpressing OsSTAP1 exhibited increased tolerance to salt stress with higher SOD, POD, and CAT activities, and lower Na⁺/K⁺ ratios in the shoots. In addition, many other stress-responsive genes, including other ERF- and peroxidase-encoding genes, were upregulated in the OsSTAP1-overexpression lines.

Conclusion

This study suggests that OsSTAP1 functions as an AP2/ERF transcriptional activator, and plays a positive role in salt tolerance by decreasing the Na⁺/K⁺ ratio and maintaining cellular redox homeostasis.

中文翻译：

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转录因子基因OsSTAP1的过表达提高了水稻的耐盐性。

背景

高盐分会导致全世界水稻生产力的重大损失，这主要是因为盐会抑制植物的生长并降低谷物的产量。为了应对环境变化，植物已经进化出几种适应性机制，其中涉及许多应激反应基因的调控。

结果

在这项研究中，我们确定了编码AP2 / ERF型转录因子的OsSTAP1，可通过ABA，ACC，盐，冷和PEG处理快速诱导。OsSTAP1位于细胞核，并在植物细胞中充当转录激活因子。与野生型相比，过表达OsSTAP1的转基因品系具有更高的SOD，POD和CAT活性，并且对芽的Na ⁺ / K ⁺比值较低，因此对盐胁迫的耐受性增强。此外，OsSTAP1过表达株系还上调了许多其他应激反应基因，包括其他ERF和过氧化物酶编码基因。

结论

这项研究表明，OsSTAP1充当AP2 / ERF转录激活因子，并通过降低Na ⁺ / K ⁺比值并维持细胞氧化还原稳态来在耐盐性中发挥积极作用。