An extracellular polysaccharide is involved in the aluminum tolerance of sp. CA42, a newly isolated strain from the Chinese water chestnut growing in an actual acid sulfate soil area in Vietnam.

A novel aluminum-tolerant bacterial strain CA42 was isolated from the aquatic plant , which grows in a highly acidic swamp in Vietnam. Inoculation with CA42 allowed to grow in the presence of 300 μM AlCl at pH 3.5, and biofilms were observed around the roots.