Effect of salinity on mycorrhizal onion and tomato in soil with and without additional phosphate
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Vesicular-arbuscular mycorrhizal fungi (VAM) are known to increase plant growth in saline soils. Previous studies, however, have not distinguished whether this growth response is due to enhanced P uptake or a direct mechanism of increased plant salt tolerance by VAM. In a glasshouse experiment onions (Allium cepa L.) were grown in sterilized, low-P sandy loam soil amended with 0, 0.8, 1.6 mmol P kg−1 soil with and without mycorrhizal inoculum. Pots were irrigated with saline waters having conductivities of 1.0, 2.8, 4.3, and 5.9 dS m−1. Onion colonized withGlomus deserticola (Trappe, Bloss, and Menge) increased growth from 394% to 100% over non-inoculated control plants when soil P was low (≤ 0.2 mmol kg−1 NaHCO3-extractable P) at soil saturation extract salinities from 1.1 dS m−1 to 8.8 dS m−1. When 0.8 and 1.6 mM P was added no dry weight differences due to VAM were observed, however, K and P concentrations were higher in VAM plants in saline treatments.Glomus fasciculatum (Gerdeman and Trappe) andGlomus mosseae (Nicol. and Gerd.) isolates increased growth of VAM tomato 44% to 193% in non-sterilized, saline soil (10 dS m−1 saturation extract) despite having little effect on growth in less saline conditions when soil P was low. Higher tomato water potentials, along with improved K nutrition by VAM in onion, indicate mechanisms other than increased P nutrition may be important for VAM plants growing under saline stress. These effects appear to be secondary to the effects of VAM on P uptake.
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- Effect of salinity on mycorrhizal onion and tomato in soil with and without additional phosphate
Plant and Soil
Volume 88, Issue 3 , pp 307-319
- Cover Date
- Print ISSN
- Online ISSN
- Martinus Nijhoff, The Hague/Kluwer Academic Publishers
- Additional Links
- Leachate P
- P uptake
- Salt tolerance
- Industry Sectors
- Author Affiliations
- 1. ARS, US Salinity Laboratory, USDA, 92501, Riverside, CA, USA
- 2. Department of Plant Pathology, University of California Riverside, 92521, Riverside, CA, USA
- 3. Department of Soil and Environmental Sciences, University of California, 92521, Riverside, CA, USA