Aeromonas media in compost amendments contributes to suppression of Pythium ultimum in cress

Harnessing the Microbiomes of Suppressive Composts for Plant Protection: From Metagenomes to Beneficial Microorganisms and Reliable Diagnostics

“…Besides Pseudomonas and Enterobacter, other genera of the Gammaproteobacteria can also contribute to disease-suppressive traits of composts. For instance, Aeromonas media strains were preferentially isolated from the rhizoplane of plants grown in substrates amended with suppressive compost (Oberhaensli et al, 2017). A. media improved suppressiveness of compost against P. ultimum in cress (Lepidium sativum L.) potting experiments.…”

“…A. media improved suppressiveness of compost against P. ultimum in cress (Lepidium sativum L.) potting experiments. The largest effect was achieved when the bacterial strains were added to compost with a low suppressiveness, which increased the suppressiveness to the level of highly suppressive compost (Oberhaensli et al, 2017).…”

“…The development of robust functional assays, which allow to accurately evaluate the suppressiveness of compost, is one of the most important tasks. Due to the above mentioned pathogen-specificity of suppressive composts, such assays should be developed for a broad range of plant-pathogen systems (Bahramisharif et al, 2013;Oberhaensli et al, 2017), and ideally should be miniaturized to allow sufficient throughput at manageable costs.…”

“…For instance, A. media was the dominant species in the rhizoplane of cress grown in a suppressive compost as compared to cress grown in non-suppressive composts. The addition of A. media to non-suppressive compost increased the suppressiveness against P. ultimum (Oberhaensli et al, 2017). Importantly, the creation of a collection of rhizoplane strains isolated from protected plants represents a critical first objective of the integrated systems approach and a highly valuable resource not only for FIGURE 1 | An integrated systems approach to enhance our understanding of the microorganisms responsible for the disease-suppressive effects of compost (red boxes) in various plant-pathogen systems.…”

Indicative bacterial communities and taxa of disease-suppressing and growth-promoting composts and their associations to the rhizoplane

“…For example, Aeromonas media has been identified as an important component of a compost suppressive against P. ultimum (Oberhaensli et al . 2017 ), and Bacillus spp., Pseudomonas spp. and Achromobacter xylosoxidans isolated from compost extracts have been suppressive against P. aphanidermatum (Ben Jenana et al .…”