Progress in the regulation of salt tolerance in rice

Salt stress severely limits the growth and development of rice and is one of the major causes of yield reduction in rice. Plants have developed a variety of adaptive physiological and biochemical strategies over time, including re-establishing reactive oxygen species (ROS) homeostasis and maintaining ion homeostasis and osmotic homeostasis to withstand high salt environments. nADPH oxidase (Rboh), a major source of H2O2, plays an important role in the plant response to salt stress. However, the role and mechanism of Rboh in response to salt stress in rice are still unclear. Recently, Jiang Mingyi's group at Nanjing Agricultural University published a paper entitled "The NADPH oxidase OsRbohA increases salt tolerance by modulating K+ homeostasis in rice" in The Crop Journal. The research paper, entitled "The NADPH oxidase OsRbohA increases salt tolerance by modulating K+ homeostasis in rice.

It was found that salt stress induced the expression of OsRbohA in rice seedlings; knockdown of OsRbohA reduced the tolerance of rice to salt stress (Figure 1). In addition, in the rice root system, OsRbohA played a key role in regulating salt stress-induced increases in NADPH oxidase activity and H2O2 content. Under NaCl treatment, loss of function of OsRbohA disrupted K+ homeostasis and inhibited root growth by decreasing the expression of K+ transporter and channel protein-related genes (OsGORK, OsAKT1, OsHAK1 and OsHAK5) in roots, whereas overexpression of OsRbohA significantly promoted the expression of K+ transporter and channel protein-related genes, thereby reducing The overexpression of OsRbohA significantly promoted the expression of K+ transporter and channel protein-related genes, thus reducing the loss of K+ ions in the root system caused by salt stress. The results suggest that OsRbohA-mediated H2O2 accumulation improves salt tolerance in rice by regulating K+ homeostasis.

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