P25-6 : Phylogeny and Functions of Bacterial Communities Associated with Field-Grown Rice Shoots

大久保 卓^1,2,池田 成志^1,3,佐々木 和浩¹,大島 健志朗⁴,服部 正平⁴,佐藤 雅志¹,南澤 究¹
1東北大・院生命科学, 2農環研, 3北海道農業研究センター, 東京大・院新領域,
Metagenomic analysis was applied to bacterial communities associated with shoots of two field-grown rice cultivars, Nipponbare and Kasalath. In both cultivars, shoot microbiomes were dominated by Alphaproteobacteria (51–52%), Actinobacteria (11–15%), Gammaproteobacteria (9–10%), and Betaproteobacteria (4–10%). Compared with other rice microbiomes (root, rhizosphere, and phyllosphere) in public databases, the shoot microbiomes harbored abundant genes for C1 compound metabolism and 1-aminocyclopropane-1-carboxylate catabolism, but fewer genes for indole-3-acetic acid production and nitrogen fixation. Salicylate hydroxylase was detected in all microbiomes except the rhizosphere. These genomic features facilitate understanding of plant–microbe interactions and biogeochemical metabolism in rice shoots.

keywords:メタゲノム,植物共生細菌,,,