Journal
PLANTA
Volume 237, Issue 3, Pages 717-729Publisher
SPRINGER
DOI: 10.1007/s00425-012-1789-5
Keywords
Plant-microbe interactions; Hyperaccumulation; Alternaria astragali; Fusarium acuminatum; mu-X-ray absorption near edge spectroscopy; mu-X-ray fluorescence mapping
Categories
Funding
- National Science Foundation [IOS-0817748]
- Office of Science, Basic Energy Sciences, and Division of Materials Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0817748] Funding Source: National Science Foundation
Ask authors/readers for more resources
Little is known about how fungi affect plant selenium (Se) accumulation. Here we investigate the effects of two fungi on Se accumulation, translocation, and chemical speciation in the hyperaccumulator Astragalus racemosus and the non-accumulator Astragalus convallarius. The fungi, Alternaria astragali (A3) and Fusarium acuminatum (F30), were previously isolated from Astragalus hyperaccumulator rhizosphere. A3-inoculation enhanced growth of A. racemosus yet inhibited growth of A. convallarius. Selenium treatment negated these effects. F30 reduced shoot-to-root Se translocation in A. racemosus. X-ray microprobe analysis showed no differences in Se speciation between inoculation groups. The Astragalus species differed in Se localization and speciation. A. racemosus root-Se was distributed throughout the taproot and lateral root and was 90 % organic in the lateral root. The related element sulfur (S) was present as a mixture of organic and inorganic forms in the hyperaccumulator. Astragalus convallarius root-Se was concentrated in the extreme periphery of the taproot. In the lateral root, Se was exclusively in the vascular core and was only 49 % organic. These findings indicate differences in Se assimilation between the two species and differences between Se and S speciation in the hyperaccumulator. The finding that fungi can affect translocation may have applications in phytoremediation and biofortification.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available