Arsenic transformation and plant growth promotion characteristics of As-resistant endophytic bacteria from As-hyperaccumulator Pteris vittata. (February 2016)

• Record Type: Journal Article
• Authors: Xu, Jia-Yi; Han, Yong-He; Chen, Yanshan; Zhu, Ling-Jia; Ma, Lena Q.
• Is Part Of: Chemosphere. Volume 144(2016)
• Page Start: 1233
• Page End: 1240
• Publication Date: 2016-02
• Subjects: Endophytic bacteria -- Pteris vittata -- Arsenic resistance -- Oxidation -- Reduction; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2015.09.102
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The ability of As-resistant endophytic bacteria in As transformation and plant growth promotion was determined. The endophytes were isolated from As-hyperaccumulator Pteris vittata (PV) after growing for 60 d in a soil containing 200 mg kg −1 arsenate (AsV). They were isolated in presence of 10 mM AsV from PV roots, stems, and leaflets, representing 4 phyla and 17 genera. All endophytes showed at least one plant growth promoting characteristics including IAA synthesis, siderophore production and P solubilization. The root endophytes had higher P solubilization ability than the leaflet (60.0 vs. 18.3 mg L −1 ). In presence of 10 mM AsV, 6 endophytes had greater growth than the control, suggesting As-stimulated growth. Furthermore, root endophytes were more resistant to AsV while the leaflet endophytes were more tolerant to arsenite (AsIII), which corresponded to the dominant As species in PV tissues. Bacterial As resistance was positively correlated to their ability in AsV reduction but not AsIII oxidation. The roles of those endophytes in promoting plant growth and As resistance in P. vittata warrant further investigation. Graphical abstract: Highlights: 43 As-resistant endophytic bacteria were identified from Pteris vittata. All endophytes showed plant growth promotion characteristics. The roots isolates showed higher tolerance to AsV. The leaflet and stem endophytes showed higher tolerance to AsIII. Bacterial As resistance was positively correlated to their ability in AsV reduction.