High impact information on CBL9

• When CBL9 gene function was disrupted in Arabidopsis thaliana plants, the responses to ABA were drastically altered [1].
• Expression of CBL9 was inducible by multiple stress signals and abscisic acid (ABA) in young seedlings [1].
• The cbl9 mutant plants showed enhanced expression of genes involved in ABA signaling, such as ABA-INSENSITIVE 4 and 5 [1].
• Earlier genetic analyses revealed three genes encoding two Ca(2+) sensors (CBL1 and CBL9) and their target protein kinase (CIPK23) to be critical for plant growth on low-K media and for stomatal regulation, indicating that these calcium signaling components participate in the low-K response and turgor regulation [2].
• We therefore suggest that, by alternative complex formation with either CBL1 or CBL9, the kinase CIPK1 represents a convergence point for ABA-dependent and ABA-independent stress responses [3].

Anatomical context of CBL9

• Physical interaction of CIPK1 with CBL1 and CBL9 targets the kinase to the plasma membrane [3].

Other interactions of CBL9

• We report here the functional characterization of CIPK1, a protein kinase interacting strongly with the calcium sensors CBL1 and CBL9 [3].

References