Based on putative protein sequences, the six OsiICKs are grouped into two classes, with OsiICK1 and OsiICK6 in each of the two classes, respectively. Results showed that OsiICK1 and OsiICK6 interacted with OsCYCD, but differed in their interactions with CDKA. Both EGFP:OsiICK1 and EGFP:OsiICK6 were localized in the nucleus. Whereas EGFP:OsiICK6 showed a punctuate subnuclear distribution, OsiICK1 had a homogeneous pattern. Over-expression of OsiICK6 resulted in multiple phenotypic effects on plant growth, morphology, pollen viability and seed setting. In OsiICK6-over-expressing plants, leaves rolled toward the abaxial side, suggesting that cell proliferation is critical in maintaining an even growth along the dorsal-ventral plane of leaf blades.
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