“…One of such mechanisms is molecular chaperones -a group of proteins that respond to sudden increase in temperature or exposure to other environmental stresses (Feder & Hofmann, 1999;Salathia & Queitsch 2007;Sangster et al, 2004;Sørensen et al, 2003). Molecular chaperones, particularly Hsp90, also restrict stochastic phenomena within cells, by minimizing developmental perturbations, thereby canalizing the organism's development (Samakovli et al, 2007). Results presented in this study provide evidence that in Iris pumila plants the relative level of heat shock proteins Hsp70 and Hsp90 (Hsp90a and Hsp90b isoforms), varied significantly in a single generation, between the samples of local and foreign genotypes reciprocally transplanted to their original light habitats ("local vs. foreign" approach), and in the same genotype grown under alternative light conditions ("at home vs. away" approach), or among different seasons in the same habitat ("spring vs. summer").…”