Chinese Bulletin of Botany ›› 2018, Vol. 53 ›› Issue (2): 149-153.DOI: 10.11983/CBB18039
• COMMENTARY • Next Articles
Duan Zhikun, Qin Xiaohui, Zhu Xiaohong, Song Chunpeng*()
Received:
2018-02-03
Accepted:
2018-03-08
Online:
2018-03-01
Published:
2018-08-10
Contact:
Song Chunpeng
Duan Zhikun, Qin Xiaohui, Zhu Xiaohong, Song Chunpeng. Making Sense of Cold Signaling: ICE is Cold or not Cold?[J]. Chinese Bulletin of Botany, 2018, 53(2): 149-153.
Figure 1 A proposed working model shows the roles of MAP kinase cascades during the cold response in Arabidopsis and riceLow temperature induces changes in cytoplasmic calcium signaling. In Arabidopsis, calcium/calmodulin regulated receptor-like kinase 1 and 2 (CRLK1 and CRLK2) are activated by cold signal, and then initiate MEKK1-MKK2-MPK4 cascade, which suppresses cold-induced activation of MPK3/6, thus positively regulating cold tolerance. MKK4/5-MPK3/6 cascades can also be rapidly activated in cold stress in parallel with MEKK1-MKK2-MPK4. Constitutively activated MPK3/6 by MKK5 phosphorylate ICE1 to promote degradation of ICE1, which decreases the transcriptional activity of CBFs, thus negatively regulating cold to- lerance in Arabidopsis. OST1 also phosphorylates and affects the stability of ICE1, and positively regulate cold tolerance. In rice, cold signal induces the activation of OsMAPK3 that phosphorylates the OsICE1 and inhibits OsICE1 degradation by interrupting the interaction of OsHOS1 and OsICE1 to maintain the stability of OsICE1. Phosphorylated OsICE1 activates the transcription of OsTPP1 to promote the accumulation of trehalose, and enhances the cold tolerance of rice. (Arrows represent activation, and bars represent inhibition, dotted lines represent unknown mechanisms. Red lines represent signal pathways in Arabidopsis, and black lines represent signal pathways in rice)
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