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MEcPP levels directly or indirectly regulates flowering time by altering BBX19 transcript levels. (A) MEcPP accumulation in response to stress reduces the BBX19 transcript levels and promotes availability of CO for activation of FT. (B) Under unstressed conditions MEcPP does not accumulate hence allowing expression of BBX19 to sufficiently high levels resulting in its interaction with and depletion of CO pool required for activation of FT.
