“…Plant PPO proteins generally contain three conserved regions, namely an N-terminal cTP, a CuA and CuB (tyrosinase) domain, and a C-terminus extension ( Tran et al., 2012 ), which are responsible for thylakoid lumen localization and enzyme activity. PPO proteins are found in many species of terrestrial plants, such as apple ( Guardo et al., 2013 ), strawberry ( Jia et al., 2016 ), potato ( Chi et al., 2014 ), tomato ( Newman et al., 1993 ), banana ( Gooding et al., 2001 ), Populus ( He et al., 2021 ), rice (Yanchun Yu et al., 2008 ), wheat ( Beecher et al., 2012 ), barley ( Taketa et al., 2010 ), and eggplant ( Jukanti and Bhatt, 2015 ), as well as in fungi ( Li et al., 2011 ) and bacteria ( Gorshkov et al., 2017 ). However, no homologs of the PPO gene were found in the Arabidopsis thaliana genome ( Tran et al., 2012 ).…”