“…Examples are Bet v 1 from birch (Swoboda et al, 1996), Mal d 1 from apple (Malus domestica; Vanek-Krebitz et al, 1995), Pru ar 1 from apricot (Prunus armeniaca), Pru av 1 from cherry (Neudecker et al, 2001), and Dau c 1 from carrot (Daucus carota; Yamamoto et al, 1997). On the other hand, several PR-10 proteins are up-regulated upon pathogen infection (Walter et al, 1990;Breda et al, 1996;Pü hringer et al, 2000;Park et al, 2004;Liu et al, 2005), have a direct and selective antifungal activity, or accumulate in overwintering organs of tree species, suggesting a key role in selective defense mechanisms against microbes and fungi and in protecting plants from abiotic stresses (Yu et al, 2000;Flores et al, 2002;Chadha and Das, 2006). In addition, a number of PR-10 proteins are constitutively expressed at different plant developmental stages and/ or in different tissues and organs, such as in seeds, roots (Sikorski et al, 1999), flowers, and senescent leaves (Breiteneder et al, 1989;Crowell et al, 1992;Barrat and Clark, 1993;Vanek-Krebitz et al, 1995;Sikorski et al, 1999), suggesting a role for PR-10 proteins also in developmental regulation.…”