Most plant lectins were originally isolated from seeds and vegetative storage tissues. Accumulating data have revealed that plants ubiquitously synthesize lectins in response to abiotic and biotic stresses. These inducible lectins are synthesized and then exported to vacuoles by signal peptides or reside in the cytoplasm [18, 19] . The physiological function of plant lectins for subcellular localization remains obscure. However, the major assumption is that lectins are involved in defense and may also have a role in signal transduction for response to stress [20] . Structure analysis of plant lectins demonstrated a diverse group of proteins that can be classified into 6 different groups (http:// www.cermav.cnrs.fr/lectines/): monocot lectin, hevein domain lectins, b-prism lectins, b-trefoil lectins, cyanovirin-N homologs, and legume lectin.