Salt stress affects in vitro growth and in situ symbioses of ectomycorrhizal fungi |
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| Authors: | R K Dixon M V Rao V K Garg |
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| Institution: | (1) Environmental Research Laboratory, U.S. Environmental Protection Agency, 97333 Corvallis, OR, USA;(2) Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 024, TN, India;(3) Biomass Research Centre, National Botanical Research Institute, Lucknow, 226001, UP, India |
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| Abstract: | Ten isolates of six species of ectomycorrhizal fungi were grown in vitro at nine concentrations of three sodium salts (NaCl, Na2SO4, Na3C6H5O7) for 4 weeks. Colony diamater, biomass and protein content of fungi were evaluated. Isolates of Pisolithus tinctorius and Suillus luteus were more tolerant of NaCl and Na2SO4 than of Na3C6H5O7. Fungi in the genera Cenococcum, Laccaria, and Thelephora were highly intolerant of Na3C6H5O7 and Na2SO4 in vitro. Biomass and protein content of fungi generally declined with increasing substrate salinity in solution culture. In situ ectomycorrhizal colonization by Laccara laccata and P. tinctorius and the dry weight of Pinus taeda seedlings were significantly reduced by 80 mM NaCl after 14 weeks. Only select ectomycorrhizal fungi appear capable of growth and symbiosis in saline soils. |
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| Keywords: | Pisolithus tinctorius Laccaria laccata Cenococcum geophilum Thelephora terrestris Salt stress |
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