Chemotaxis of Pseudomonas lachrymans to plant extracts and to water droplets collected from the leaf surfaces of resistant and susceptible plants

Pseudomonas lachrymans was attracted to plant extracts and to water droplets collected from the surface of leaves of both susceptible (cucumber, melon and water-melon) and resistant (cotton, tomato and lettuce) plants grown under non-sterile conditions for 4 to 5 weeks. Chemotaxis was directly correlated with the concentrations of amino acids and carbohydrates in the water droplets collected from the leaf surface of the tested plants. The chemotactic response of P. lachrymans towards individual amino acids, sugars, nucleotides and vitamins was also studied.