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Plant associated endophytic Acremo- nium species are capable of interacting with the host plant and altering its response towards pathogens and pests. Specialized root-coloniz- ing Acremonium spp. can achieve biocontrol effects based on induced disease resistance in whole plant assays. However, these fungi are hard to detect and to study in root tissue by classical methods of light microscopy or micro- biology. To enable further progress in investigations of induced mechanisms of de- fence in the plant, better visualization of the endophytic symbiont Acremonium strictum was attempted by use of autofluorescent GFP- transformants. Subcultures of three stable transformed A. strictum-isolates were used in agar plate assays with sterilized flax seedlings to document root colonization and infection with confocal laser scanning microscopy. In green- house tests the fitness of the transformants was proved in comparison to the wild type A. strictum for bioprotection against Fusarium-wilt. In these trials the endophyte trait to reduce disease incidence and symptom severity was verified in all three transformants as well as in the wild type of A. strictum. The suitability of these transfor- mants for further research scopes and microscopy methods are indicated.

plant root

Suitability of GFP-transformed isolates of the fungal root endophyte &lt;i&gt;Acremonium strictum&lt;/i&gt; W. Gams for studies on induced &lt;i&gt;Fusarium&lt;/i&gt;-wilt resistance in flax