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

• DOI: 10.1093/femsec/fiab134
• Publication Date: 2021-09-17T11:41:57Z
• Authors: Johanna Mayerhofer; Barbara Thuerig; Thomas Oberhaensli; Eileen Enderle; Stefanie Lutz; Christian H Ahrens; Jacques G Fuchs; Franco Widmer
• Keywords: 0301 basic medicine; 2. Zero hunger; Soil; 03 medical and health sciences; Bacteria; Composting; Crop health, quality, protection; Pythium; Soil Microbiology; Research Article

ABSTRACT Compost applications vary in their plant growth promotion and disease suppression, likely due to differences physico-chemical biological parameters. Our hypothesis was that bacteria are important for suppression of composts and, therefore, having these traits would contain similar sets indicative bacterial taxa. Seventeen prepared from five different commercial providers starting materials were classified accordingly with bioassays using cress plants the pathogen Pythium ultimum. Using a metabarcoding approach, communities assessed bulk rhizoplanes. Six nine showed significant or promotion, respectively, but did not correlate. Growth correlated positively nitrate content composts, whereas negatively factors representing compost age. explained portions variation community structures, i.e. 11.5% 14.7%, respectively. Among sequence variants (SVs) associated Microvirga, Acinetobacter, Streptomyces, Bradyrhizobium Bacillus highly promising, while suppressive Ureibacillus,Thermogutta Sphingopyxis most promising. Associated SVs represent basis developing prediction tools desired goal targeted production application.