Arbuscular mycorrhizal symbiosis alleviates detrimental effects of saline reclaimed water in lettuce plants
- 28 November 2013
- journal article
- research article
- Published by Springer Science and Business Media LLC in Mycorrhiza
- Vol. 24 (5), 339-348
- https://doi.org/10.1007/s00572-013-0542-7
Abstract
The present study evaluated the effects of inoculation with arbuscular mycorrhizal fungi (AMF; Glomus iranicum var. tenuihypharum sp. nova) on the physiological performance and production of lettuce plants grown under greenhouse conditions and supplied with reclaimed water (RW; urban-treated wastewater with high electrical conductivity; 4.19 dS m−1). Four treatments, fresh water, fresh water plus AMF inoculation, RW and RW plus AMF inoculation, were applied and their effects, over time, analyzed. Root mycorrhizal colonization, plant biomass, leaf-ion content, stomatal conductance and net photosynthesis were assessed. Overall, our results highlight the significance of the AMF in alleviation of salt stress and their beneficial effects on plant growth and productivity. Inoculated plants increased the ability to acquire N, Ca, and K from both non-saline and saline media. Moreover, mycorrhization significantly reduced Na plant uptake. Under RW conditions, inoculated plants also showed a better performance of physiological parameters such as net photosynthesis, stomatal conductance and water-use efficiency than non-mycorrhizal plants. Additionally, the high concentration of nutrients already dissolved in reclaimed water suggested that adjustments in the calculation of the fertigation should be conducted by farmers. Finally, this experiment has proved that mycorrhization could be a suitable way to induce salt stress resistance in iceberg lettuce crops as plants supplied with reclaimed water satisfied minimum legal commercial size thresholds. Moreover, the maximum values of Escherichia coli in the reclaimed water were close to but never exceeded the international thresholds established (Spanish Royal Decree 1620/2007; Italian Decree, 2003) and hence lettuces were apt for sale.Keywords
This publication has 37 references indexed in Scilit:
- Ultrastructural evidence for AMF mediated salt stress mitigation in Trigonella foenum-graecumMycorrhiza, 2012
- Effects of nursery preconditioning through mycorrhizal inoculation and drought in Arbutus unedo L. plantsMycorrhiza, 2010
- Salt stimulation of growth and photosynthesis in an extreme halophyte, Arthrocnemum macrostachyumPlant Biology, 2009
- Arbuscular mycorrhizal fungi in alleviation of salt stress: a reviewAnnals of Botany, 2009
- Community of arbuscular mycorrhizal fungi in a coastal vegetation on Okinawa island and effect of the isolated fungi on growth of sorghum under salt-treated conditionsMycorrhiza, 2008
- Improved tolerance of maize plants to salt stress by arbuscular mycorrhiza is related to higher accumulation of soluble sugars in rootsMycorrhiza, 2002
- Growth of mycorrhizal tomato and mineral acquisition under salt stressMycorrhiza, 2000
- Tissue magnesium and calcium affect arbuscular mycorrhiza development and fungal reproductionMycorrhiza, 1998
- Displacement of Ca2+ by Na+ from the Plasmalemma of Root CellsPlant Physiology, 1985
- Improved procedures for clearing roots and staining parasitic and vesicular-arbuscular mycorrhizal fungi for rapid assessment of infectionTransactions of the British Mycological Society, 1970