FIG. 14.

Population dynamics of P. syringae pv. syringae B728a hrp mutants (ΔhrpZ::nptII, hrpJ::ΩSpc, and ΔhrcC::nptII) in association with field-grown snap bean plants. The bacterial strains were inoculated onto seeds immediately before planting. Samples were seeds or germinating seedlings collected on or before days 7 (A) and 9 (B) after planting; primary leaves were collected between 9 and 14 (A) and 12 and 20 (B) days after planting; and single leaflets from trifoliolate leaves were collected at all other times. Each datum point represents the mean log CFU per sample and SE based on three (A) or four (B) replicate plots with six or eight individual samples per plot. Inverted solid triangles indicate rain events with sustained rates of >1 mm min⁻¹. Reprinted from reference 106 with the permission of the publisher.