Figure 6
Inoculation of Vigna unguiculata leaves with M1, TSE and TSN strains of H. rubrisubalbicans and recovery of bacteria from internal tissue. V. unguiculata leaves were infiltrated twenty days after germination; the photos were taken 10 days after infiltration. The scale bars are shown (1 cm). (a) Control leaves were infiltrated with 1 mL of MgSO4 10 mM solution. (b) Leaves infiltrated with wild type strain M1 (108 cells). (c) Leaves infiltrated with 108 cells of the mutant strain TSE. (d) Leaves infiltrated with mutant strain TSN (108 cells). (e) V. unguiculata plants were infiltrated with the indicated strains, and ten days later they were superficially disinfected, macerated, the macerate was diluted and plated. The plates were kept at 30 °C for 24 hours and colonies counted. The experiment contained five plants in each condition and repeated on at least three separate dates. Results are shown as means of Log10 (number of bacteria g-1 of fresh root). Standard deviation (Student t-test, p < 0.05).