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Crosstalk between the CBL-CIPK and SA signaling pathways in the wheat-Pucciniastriiformis f.sp.tritici pathosystem

Jun Guo  Peng Liu  Yinghui Duan  Jia Guo  Zhensheng Kang  
【摘要】:Intracellular calcium changes during plant-pathogen interaction are essential early events leading to both local and systemic acquired resistances.Salicylic acid,a critical messenger,is also required for both responses.However,the relationship between the CBL-CIPK and SA signaling pathways during wheat-Pst interaction is unclear.In this study,we isolated seven wheat CBL and 11 wheat CIPK genes and designated them as TaCBL1,2,3,4,6,7,9 and TaCIPK2,5,7,9,10,14,15,17,23,31,32.Some wheat CBLs and CIPKs were functionally characterized.Concurrently,wheat TaNPR1 as a master regulator of SA-mediated host response during Pst infection was functionally characterized.Silencing of TaCIPK10 and TaNPR1 permitted increased rust development in a wheat variety that was resistant to Pst pathotype CYR23.Decreased levels of salicylic acid(SA) was observed in TaCIPK10-silenced wheat plants.Yeast two-hybrid and biomolecular fluorescence complementation(BiFC) revealed that TaCIPK10 interacted with TaNPR1.These results suggest that the crosstalk between CBL-CIPK and SA singaling pathway which is involved in innate immunity of wheat to Pst.

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