The Infection Biology of Sphaerulina musiva: Clues to Understanding a Forest Pathogen
Figure 2
Scanning electron micrographs (SEM) of stems inoculated with a conidial suspension of Sphaerulina musiva at two different times (6 h and 12 h) post-inoculation (PI) depicting germination and penetration on the moderately resistant (NM6) and susceptible (NC11505) clones.
(A) SEM micrograph of stem surface of NC11505 depicting S. musiva conidium 6 h PI. (B) SEM micrograph of stem surface of NM6 and conidium of S. musiva 6 h PI. (C) SEM micrograph of stem surface of NC11505 with conidium and germ tube of S. musiva entering a lenticel 12 h PI. (D) SEM micrograph of stem surface of NM6 with conidium and germ tube of S. musiva penetrating a small opening 12 h PI. (E) Micrograph (C) at increased magnification depicting penetration of lenticel by a germ tube. (F) SEM micrograph of stem surface of resistant clone NM6 with germ tube of S. musiva penetrating a small opening 12 h PI. Tr = trichome, Sp = conidium, L = lenticel, GT = germ tube, Op = small opening. Magnification and scale bars included on the bottom of each image.