Terminid
Site-
specific, localized increase of an antimicrobial secondary metabolite (phytoalexin) was found in the
apoplast of S. bicolor in response to the fungal pathogen
· Colletotrichum graminicola. The accumulation of phytoalexin starts with the occurrence of spherical
cytoplasmic inclusions of about 1 m in diameter that merge to form a large entity of ~ 20 m
diameter.
· Similarly, during barley-powdery mildew interaction the deposition of H2O2 containing vacuole struc
tures were observed.
· Ultrastructural analysis showed that these vesicle-like bodies consist of a broad range of cellular
structures that includes miniature cell wall appositions, para-mural bodies, and multivesicular bodies.
· This condition reflects the specialized transport of different antimicrobial proteins, regulatory
polypeptides, cell wall components, and other defense-related cargo.
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