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Figure 5 | BMC Plant Biology

Figure 5

From: Cbfgenes of the Fr-A2 allele are differentially regulated between long-term cold acclimated crown tissue of freeze-resistant and – susceptible, winter wheat mutant lines

Figure 5

Model Relating Cold-Acclimation, Cbf- genes and FR versus FS Freeze Resistance. From the central cluster, we choose Cbf-12 or -14 as a key regulator (Cbf-K) of target Cbf genes such as Cbf-3, -5 and -6 (Cbf-T) as well as down-stream target genes (TGs). (I) Activator (A) is able to upregulate Cbf-K resulting in a functional CBF-K and activation of downstream events. (II) Modification of activator (A) by mutagenesis or a mutation in the activator binding site could result in loss of downstream actions and the lower level of freeze survival of the FS line. (III) Cbf-K may be repressed by an external repressor of by repressor function of CBF-K. As a result the downstream activities are not operational and the FS line is observed. (IV) A mutation resulting in disruption of repression of Cbf-K would lead to up regulation of Cbf-T and its TGs and the increased freeze survival of the FR line.

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BMC Plant Biology

ISSN: 1471-2229

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