Those in plants include genes with dramatically increased expression, encoding proteins (AAAP, CPA2, DMT, MFS, OPT, POT) that transport such substances as amino acids, cations, and carbohydrates (Fig. 4) (Fischer et al. 1998, 2002; Pao et al. 1999; Saier et al. 1999; Jack et al. 2001; Koh et al. 2002; Wipf et al. 2002).