Abstract:
BACKGROUND:Calcineurin B-like (CBL) proteins belong to a unique group of calcium sensors in plant that decode the Ca(2+) signature by interacting with CBL-interacting protein kinases (CIPKs). Although CBL-CIPK complexes have been shown to play important roles in the responses to various stresses in plants, little is known about their functions in wheat. RESULTS:A total of seven TaCBL and 20 TaCIPK genes were amplified from bread wheat, Triticum aestivum cv. Chinese Spring. Reverse-transcriptase-polymerase chain reaction (RT-PCR) and in silico expression analyses showed that TaCBL and TaCIPK genes were expressed at different levels in different tissues, or maintained at nearly constant expression levels during the whole life cycle of the wheat plant. Some TaCBL and TaCIPK genes showed up- or down-regulated expressions during seed germination. Preferential interactions between TaCBLs and TaCIPKs were observed in yeast two-hybrid and bimolecular fluorescence complementation experiments. Analyses of a deletion series of TaCIPK proteins with amino acid variations at the C-terminus provided new insights into the specificity of the interactions between TaCIPKs and TaCBLs, and indicated that the TaCBL-TaCIPK signaling pathway is very complex in wheat because of its hexaploid genome. The expressions of many TaCBLs and TaCIPKs were responsive to abiotic stresses (salt, cold, and simulated drought) and abscisic acid treatment. Transgenic Arabidopsis plants overexpressing TaCIPK24 exhibited improved salt tolerance through increased Na(+) efflux and an enhanced reactive oxygen species scavenging capacity. CONCLUSIONS:These results contribute to our understanding of the functions of CBL-CIPK complexes and provide the basis for selecting appropriate genes for in-depth functional studies of CBL-CIPK in wheat.
journal_name
BMC Plant Bioljournal_title
BMC plant biologyauthors
Sun T,Wang Y,Wang M,Li T,Zhou Y,Wang X,Wei S,He G,Yang Gdoi
10.1186/s12870-015-0657-4subject
Has Abstractpub_date
2015-11-04 00:00:00pages
269issn
1471-2229pii
10.1186/s12870-015-0657-4journal_volume
15pub_type
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