A Supprescin from a Phytopathogenic Fungus Deactivates Transcription of a Plant Defense Gene Encoding Phenylalanine Ammonia-lyase

The Lipopolysaccharide of Sinorhizobium meliloti Suppresses Defense-Associated Gene Expression in Cell Cultures of the Host Plant Medicago truncatula

“…Another mechanism that could be responsible for S. meliloti LPS-mediated suppression of plant defense is the interference with basal elements of the signal transduction pathways responsible for the activation of defense responses. In the case of the phytopathogenic fungus Mycosphaerella pinodes, it has been shown that a glycopeptide termed supprescin is able to suppress plant defense at different levels, including induction of PAL transcription (Wada et al, 1995). The mechanism of suppression is likely to involve interference of the supprescin glycopeptide with a plasma membrane ATPase via direct interaction (Kato et al, 1993).…”

Signal and nutrient exchange at biotrophic plant–fungus interfaces

“…No physiological suppressors from biotrophic interactions with fungi are known yet, although oligogalacturonide oligomers have been chemically and enzymatically released from wheat leaves that suppress elicitor-induced defense reactions [32]. Glycopeptides (called supprescins) from the necrotrophic pea pathogen Mycosphaerella pinodes [33] and cyclic β-glucans produced by the bacterial symbiont of soybean Bradyrhizobium japonicum [34] are examples of suppressors of plant defense responses.…”

Plant-Fungal Interactions and Plant Disease

“…Taken together, these data indicate that the suppressors may not function simply by inhibiting elicitor binding to a receptor in pea membranes, but rather by affecting the signaling pathway that leads to the activation of the resistance response. This was further substantiated by the observation that the supprescins rapidly but transiently reverse the elicitor-induced transcription of the PAL gene resulting in a delayed defense response of the plant (Wada et al, 1995).…”