“…The npf2.13‐2 single mutant still displayed TM sensitivity and TM absorption ability (Figs 2b,c, 5d,e), indicating that NPF2.13‐independent TM import occurs in plants. As the Arabidopsis NPF proteins comprise 53 members, which share similar sequences and functions (Tsay et al ., 2007; Wang et al ., 2018), we examined whether the following NPF proteins function redundantly with NPF2.13 in mediating TM entry into cells: NPF6.3, a nitrate/auxin transporter (Huang et al ., 1996; Guo et al ., 2001; Krouk et al ., 2010); NPF6.4, a putative polyamine transporter (Tong et al ., 2016); NPF7.3, a nitrate/IBA transporter (Lin et al ., 2008; Watanabe et al ., 2020); and NPF2.12, a nitrate/gibberellic acid (GA) transporter (Almagro et al ., 2008; Chiba et al ., 2015; Wulff et al ., 2019). However, the T‐DNA insertional mutants of these NPF genes showed WT‐like TM sensitivity (Fig.…”