01725naa a2200157 a 450000100080000000500110000800800410001910000150006024501740007526000090024952011740025865300240143270000160145670000150147277300800148712795432025-01-20       1989    bl uuuu     u00u1 u    #d1 aWILKES, J.  aProduction of ethylene by Endothia gyrosa and Cytospora eucalipticola and its possible relationship to kino vein formation in Eucalyptus maculata.h[electronic resource]  c1989  aThe production of ethylene by isolates of Endothia gyrosa and Cytospora eucalypticola, and by sapwood tissues of Eucalyptus maculata inoculated with these organisms, was assessed in vitro to help define the role played by the fungi in stimulating kino vein formation in vivo after injury. The synthesis of ethylene by the fungi growing on artificial substrates and dead sapwood was methionine-dependent, but was unaffected by the addition of 1-aminocyclopropane-1-carboxylic acid (ACC). Inoculation served to suppress evolution of ethylene from living sapwood. In these tissues, supplementation with ACC stimulated ethylene production regardless of the inoculation treatment while methionine had the converse effect. It thus appears that infected wounds have two possible sources of ethylene that would stimulate kino vein development. The hormone could be of microbial origin if the availability of methionine is enhanced as part of the host response mechanism, or of host origin if the potential for stress ethylene production via ACC (as apparent in vitro after the physical injury associated with excision of tissues) is realised in vivo as a reaction to infection.  aEucalyptus maculata1 aDALE, G. T.1 aOLD, K. M.  tPhysiological and Molecular Plant Pathologygv. 34, n. 2, p. 171-180, 1989.