Chinese Bulletin of Botany ›› 2017, Vol. 52 ›› Issue (3): 346-357.doi: 10.11983/CBB16095

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The Function of Sucrose Nonfermenting-1 Related Protein Kinases in Stress Signaling

Jinfei Zhang1,2, Xia Li2*, Yinfeng Xie1   

  1. 1College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China
    2Nanjing Branch of China National Center for Rice Improvement, Jiangsu High Quality Rice Engineering Technology Research Center, Institute of Food Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
  • Received:2016-04-25 Accepted:2016-07-08 Online:2017-05-27 Published:2017-05-01
  • Contact: Li Xia E-mail:jxpplx@jaas.ac.cn
  • About author:

    # Co-first authors

Abstract:

SnRKs (sucrose nonfermenting-1-related protein kinases) are key protein kinases in stress responses. In response to biotic stresses, they are involved in reactive oxygen species and salicylic acid-mediated signaling transduction pathways to enhance the plant tolerance to biological stress. In response to abiotic stresses, SnRKs enhance the plant tolerance to drought, salinity and high temperatures by intracellular signaling mediated by abscisic acid (ABA), regulate cellular energy homeostasis and maintain ion balance by ABA-independent signaling. SnRKs are the main regulators in stress signaling in recent research and we give a brief outlook for future study.

Figure 1

The plant SnRK2s is involved in the main ABA pathway (motified from Axel et al., 2016)(A) In the absence of ABA, the ABA receptors are inactivated and PP2C (Protein Phosphatase 2C) proteins inhibit SnRK2s; (B) In the presence of ABA, the ABA receptors PYR/PIL/RCAR proteins bind to ABA and in turn inhibit PP2C activity, allowing the activation of SnRK2s through autophosphorylation. Activated SnRK2s then phosphorylate their downstream transcription factors, which modulate ABA responding gene expression. They can also phosphorylate other proteins, such as AKT1 and NADPH oxidases. Together, these events lead to the establishment of the ABA response."

Table 1

Different functions of SnRKs gene family of Arabidopsis"