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. 2014 Jun 25;111(28):10365–10370. doi: 10.1073/pnas.1404829111

Fig. 6.

Fig. 6.

A proposed epistatic model for bolting time control in beet with BvBBX19 and BTC1d acting upstream of BvFT1 and BvFT2. The domain structure of BvBBX19 and BTC1d proteins is indicated by boxes. The open box represents the mutated domain. An interaction between the two proteins BvBBX19 and BTC1d or binding of the BvBBX19 protein to the BTC1d promoter to acquire a CO function is anticipated. In annuals, the proteins BvBBX19 and BTC1d act together to repress BvFT1 and activate BvFT2 to promote bolting and flowering under LD conditions, whereas a mutation in B2 mutants prevents floral transition without vernalization, because the floral activator BvFT2 is repressed by BvFT1. After vernalization and under LD conditions BvFT2 is activated to initiate bolting and flowering.