Polyphenol oxidase activity and yellow pigment content in Aegilops tauschii, Triticum turgidum, Triticum aestivum, synthetic hexaploid wheat and its parents

Each T. turgidum - SHW - Ae. tauschii combination represents an independent wheat hexaploidization process. By comparing 29 synthetic hexaploid wheats with their corresponding parents (maternal, T. turgidum, BBAuAu; paternal, Ae. tauschii, DD), our report highlighted different performances for PPO activity and YPC during wheat hexaploidization processes: the PPO activity of SHW can be higher, lower than both parents, or in the middle; in contrast, all the combinations showed a relative stable YPC trend. Besides, take these two traits we tested as an example, from an evolutionary perspective, the uniqueness of traits and their potential functions on polyploidy adaption or stress responses were also discussed.