PPAN and infection: However, it remains a question why the plants’ variety of LC05-136 cannot be induced to flower by infection of the reported strains Ss17 + Ss18, but can be induced by inoculation of smut fungus Ssf1-7 + Ssf1-8, even if more flowering-related genes’ high expression was detected than that of sugarcane infected by smut fungus Ssf1-7 + Ssf1-8.