RESPONSES OF CUPRESSUS AND CHAMAECYPARIS CALLUS TISSUES TO INOCULATIONS WITH SEIRIDIUM-CARDINALE

Inoculations of callus generated from micropropagated shoots of Cupres sus semper iii, ens, Cupressus macrocarpa, Cupressus torulosa and Cham aecyparis lawsoniana showed that callus of species resistant or relati vely resistant to Seiridium cardinale supported significantly less sur face growth of the pathogen than callus of susceptible species. In dua l cultures of Cupressus sempervirens or Cupressus torulosa callus with S. cardinale, inhibition of fungal growth towards the callus was corr elated with known field resistance of these host species. Lignificatio n, accumulation of polyphenolics and possible suberization of cell wai ls were detected in inoculated callus. This response was also correlat ed with known field resistance of the tested host species.