FKF1 serves to degrade CDF1, so mutant plants lacking the fkf1 gene have higher levels of CDF1.In addition, they also flower later than normal plants do and show lower levels of CONSTANS activity.

• 而CONSTANS蛋白质的含量受到拟南芥生物钟的精确控制，例如只有白昼较长时，白天植株中的该蛋白质含量才会较高。