Use of Bacillus amyloliquefaciens to improve plant defence to insects
Abstract: Bacillus amyloliquefaciens strains are tested for their ability to improve stress handling by plants. The bacteria colonize the roots and stimulate root growth. Certain Bacillus strains also provide disease suppression dependent on jasmonic acid (JA) signaling. The ability of these Bacillus strains to protect oilseed rape (Brassica napus) to insect pests often depending on JA was therefore investigated. Bacillus protection to the generalist African cotton leaf worm (Spodoptera littoralis) was found but not to the Brassica specialist Diamond back moth (Plutella xylostella). The application mode affected the protection, though. The chemical resistance inducers BABA and BION did not provide protection to the insects. The Bacillus strains show potential for plant protection and further tests aim to define the requirements for efficient protection.