title: Migration of endophytic diazotroph Azorhizobium caulinodans ORS571 inside wheat (Triticum aestivum L) and its effect on microRNAs.
abstract: Azorhizobium caulinodans ORS571, a novel rhizobium, forms endosymbionts with its nature host Sesbania rostrata, a semi-aquatic leguminous tree. Recent studies showed that A. caulinodans ORS571, as endophytic rhizobium, disseminated and colonized inside of cereal plants. However, how this rhizobium infects monocot plants and the regulatory mechanism remains unknown. MicroRNAs (miRNAs) are small, endogenous RNAs that regulate gene expression at the post-transcriptional levels. In this study, we employed laser scanning confocal microscope to monitor the pathway that rhizobium invade wheat; we also investigated the potential role of miRNAs during A. caulinodans ORS571 infecting wheat. Our results showed that gfp-labeled A. caulinodans ORS571 infected wheat root hairs and emerged lateral roots, then disseminated and colonized within roots and migrated to other plant tissues, such as stems and leaves. Endophytic rhizobium induced the aberrant expression of miRNAs in wheat with a tissue- and time-dependent manner with a peak at 12-24 h after rhizobium infection. Some miRNAs, such as miR167 and miR393 responded more in roots than that in shoots. In contrast, miR171 responded higher in shoots than that in roots. These results suggested that miRNAs could be responsive to A. caulinodans ORS571 infection and played important role in plant growth, nutrient metabolisms, and wheat-rhizobium interactions.
authors.affiliation: College of Veterinary Medicine, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Li
authors.initials: L
authors.lastname: Qiu
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Junbiao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Lin
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Sun
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China.
authors.forename: Weiling
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Life Sciences, Northwest A & F University, Yangling, 712100, Shaanxi, China. bioche@nwsuaf.edu.cn.
authors.forename: Huawei
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Biology, East Carolina University, Greenville, NC, 27858, USA. zhangb@ecu.edu.
authors.forename: Baohong
authors.initials: B
authors.lastname: Zhang
mesh_terms: D020599:Azorhizobium caulinodans / Q000502:physiology*; D035683:MicroRNAs / Q000502:physiology*; D014908:Triticum / Q000502:physiology*
chemical_list: D035683:MicroRNAs
keywords: Azorhizobium caulinodans ORS571; Dynamic colonization; MicroRNA; Wheat