Are you asking about the tip of the tap root, being broken off? I think it has a chance. Maybe sprinkle some cinnamon on it and bury it a little deeper than usual. Not based on science, just what I'd do. The reason, I'm thinking that the longer it is in darkness the longer the root will be when it gets some light. That could make up for the tip being broke off. Sounded reasonable in my do-si-do addled melon.