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Activation of MAP kinases by green leaf volatiles in grasses

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Abstract

Objective: Previously we have shown that mechanical wounding and volatiles released from cut grass, activated a 46 and 44 kDa mitogen-activated protein kinase (MAPK) in the model grass species Lolium temulentum (Lt). MAPKs play an important role as signal relays that connect incoming stress signals and stress responses. Since green leaf volatiles (GLV) are released during wounding, we wanted determine if specific compounds contained in the GLV mixture or if GLV generated from other plant species could activate these Lt MAPKs. Results: Our analysis found that just a 1-min exposure to GLV was enough to activate the Lt 46 kDa MAPK within 3 min and the 44 kDa MAPK within 15 min. This activation pattern showed similar kinetics to those observed after wounding, and the GLV and wound activated bands associated with these MAPKs displayed identical migration on sodium dodecyl sulfate polyacrylamide gels. Thirteen different commercially available plant volatiles (alcohols, aldehydes and ketones) were tested and all thirteen volatile compounds were able to activate these same Lt MAPKs. Furthermore, GLV derived from three other grass species as well as tomato, a dicot, were also shown to activate these MAPKs in Lt.

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Dombrowski, J. E., & Martin, R. C. (2018). Activation of MAP kinases by green leaf volatiles in grasses. BMC Research Notes, 11(1). https://doi.org/10.1186/s13104-017-3076-9

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