For long-day plants, what would be the effect of a mutation inhibiting the conversion of P_fr to P_r that occurs in the dark?

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Long-day plants require a critical day length for flowering, which is typically longer than 12 hours of daylight. The conversion of P_fr to P_r occurs in the dark and is necessary for the plant to detect the length of the night and therefore the day length. Inhibiting this conversion would result in early flowering under shorter than normal days because the plant would think it has already experienced a long enough night to meet the critical day length for flowering.

For Long-Day Plants, What Would Be the Effect of a Mutation