Selenium (Se) is an essential element for human health. Se-enriched agricultural products can promote people’s intake of Se. Microorganisms play an important role in Se cycling. In this study, two new bacterial strains were isolated from paddy soil and were identified as Chitinophaga sp. and Comamonas testosteroni, respectively. More than 44% and 39% of 1.0 mM selenite were reduced in 84 h by them using yeast extract as carbon source, respectively. Scanning electron microscope (SEM) and Energy dispersive X-ray spectrometry (EDS) results indicated that the reduction product of selenite was nanometer Se. These strains could promote the available Se in soil and the content of Se in rice plants in pot experiments. Organic combined Se in soils was increased up to 35%, accompanied by the 92% and 130% increase of Se in rice plants. To our best knowledge, this is the first report of Se reduction by Chitinophaga. This work might provide a prospective strategy for microbial fortification of Se in corps.

硒 (Se) 是人类健康必不可少的元素。富硒农产品可以促进人们对硒的摄入。微生物在硒循环中起重要作用。在这项研究中，从稻田土壤中分离出两种新的细菌菌株，并被鉴定为Chitinophaga sp。和睾酮丛毛单胞菌， 分别。他们使用酵母提取物作为碳源，在 84 小时内分别减少了超过 44% 和 39% 的 1.0 mM 亚硒酸盐。扫描电镜(SEM)和能量色散X射线光谱(EDS)结果表明亚硒酸盐的还原产物为纳米硒。这些菌株在盆栽试验中可以促进土壤中有效硒和水稻中硒的含量。土壤中有机结合硒增加达35%，同时水稻植株硒增加92%和130%。据我们所知，这是Chitinophaga减少硒的第一份报告。这项工作可能为微生物强化军团中的硒提供前瞻性策略。