Abstract
Monofoliate leaves of French bean cv. Canadian Wonder were inoculated by injection with suspensions of Pseudomonas phaseolicola ( c. 3·0 × 10 8 cells/ml). Trifoliate leaf tissue was examined by light and electron microscopy 3, 10 and 14 days later. A darkly staining inclusion which occurs in three forms appeared in cell vacuoles after 10 days and increased in concentration 4 days later. Large starch grains occurred in chloroplasts and despite chlorophyll levels being about half those of controls, chloroplast integrity appeared normal. Other organelles also appeared normal, though there were increases in endoplasmic reticulum and numbers of ribosomes.
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