| Title | Fluorine and white clover: Assessing fluorine's impact on Rhizobium leguminosarum |
| Publication Type | Journal Article |
| Year of Publication | 2020 |
| Authors | Geretharan T., Jeyakumar P., Bretherton M., Anderson C.WN |
| Journal | Journal of Environmental Quality |
| Volume | 49 |
| Pagination | 987-999 |
| Date Published | Jul-Aug |
| Type of Article | Article |
| ISBN Number | 0047-2425 |
| Accession Number | WOS:000615918800015 |
| Keywords | Environmental Sciences & Ecology |
| Abstract | The soil fluorine (F) concentration in New Zealand agricultural soils has increased with time as a direct result of the widespread application of phosphate fertilizer to land. Elevated soil F concentrations may potentially harm soil microorganisms, which are important for nutrient cycling and soil formation. Rhizobium leguminosarum is a N-2-fixing soil bacterium that is a fundamental component in New Zealand legume-based pastoral farming. Any impact of F on Rhizobium leguminosarum would have an adverse effect on New Zealand pasture production. In this study, F toxicity to Rhizobium leguminosarum was examined as a first step to develop F guideline values for New Zealand agricultural soils. Bottle-based experiments were conducted to examine the effect of the F- ion on Rhizobium-white clover (Trifolium repens L.) symbiosis by observing nodule morphology and growth. Results indicate that the F- concentration that causes 10% inhibition of Rhizobium respiration (IC10) for F- toxicity to Rhizobium leguminosarum was >100 mg F- L-1. Significant morphological changes occurred when Rhizobium was exposed to F concentrations of 500 and 1000 mg L-1. Both light and transmission electron micrographs confirmed that the Rhizobium leguminosarum-white clover interaction was not influenced by F- concentrations >100 mg L-1. The toxic F- concentration for Rhizobium leguminosarum determined in this study is orders of magnitude higher than the F- concentration in New Zealand agriculture soils under "normal conditions." There appears to be no indication of imminent risk of soil F to Rhizobium leguminosarum.
|
| Short Title | J. Environ. Qual.J. Environ. Qual. |
| Alternate Journal | J. Environ. Qual. |
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Geretharan, Thangavelautham Jeyakumar, Paramsothy Bretherton, Michael Anderson, Christopher W. N.
Fertiliser Association ofNewZealand
1
Wiley
Hoboken
1537-2537
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