Mycorrhizal inoculation affects arbuscular mycorrhizal diversity in watermelon roots, but leads to improved colonization and plant response under water stress only

Omirou, Michalis; Ioannides, Ioannis M.; Ehaliotis, Constantinos

doi:10.1016/j.apsoil.2012.09.013

Cited by 69 publications

(44 citation statements)

References 56 publications

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“…This effect may be partially explained by increased AMF colonisation under the RDI regime, suggesting that under water-stressed conditions, strawberry plants become more dependent on the fungal symbiosis. Water use efficiency of the strawberry plants was greater under the RDI regime than under the WW regime, which is consistent with previous findings (Grant et al 2010;Omirou et al 2013) and was greater in AMF-inoculated plants (single or combined inoculum) than non-mycorrhizal plants. Inoculation with AMF has been reported to increase WUE, for example, in watermelon (Omirou et al 2013) and wild shrub species (Querejeta et al 2006), although effects varied with different plant and AMF combinations.…”

Section: Discussionsupporting

confidence: 92%

“…Water use efficiency of the strawberry plants was greater under the RDI regime than under the WW regime, which is consistent with previous findings (Grant et al 2010;Omirou et al 2013) and was greater in AMF-inoculated plants (single or combined inoculum) than non-mycorrhizal plants. Inoculation with AMF has been reported to increase WUE, for example, in watermelon (Omirou et al 2013) and wild shrub species (Querejeta et al 2006), although effects varied with different plant and AMF combinations. This suggests that AMF colonisation not only increases water uptake but also results in the plant becoming more efficient in using available water (Kaya et al 2003;Omirou et al 2013), possibly via mechanisms of increased stomatal conductance and transpiration (Auge 2001), increased nutrient availability and/ or changes in aquaporin activation (Smith et al 2010).…”

Section: Discussionsupporting

confidence: 92%

“…Inoculation with AMF has been reported to increase WUE, for example, in watermelon (Omirou et al 2013) and wild shrub species (Querejeta et al 2006), although effects varied with different plant and AMF combinations. This suggests that AMF colonisation not only increases water uptake but also results in the plant becoming more efficient in using available water (Kaya et al 2003;Omirou et al 2013), possibly via mechanisms of increased stomatal conductance and transpiration (Auge 2001), increased nutrient availability and/ or changes in aquaporin activation (Smith et al 2010). The most notable consequence of increased WUE in the AMFcolonised strawberry plants was the significant increase in their survival time when water was not provided: mycorrhizal plants survived on average 4.4 days longer than control plants.…”

Section: Discussionmentioning

confidence: 98%

“…60 % of all water run-off following precipitation and use 80 % of this for agriculture (Fitter 2012). It is thought that most plants benefit from mycorrhizal symbiosis under water stress conditions through the improvement of water status and uptake (AlKaraki 1998;Aliasgharzad et al 2006;Auge 2001;Bolandnazar et al 2007;Koch et al 2006;Omirou et al 2013;Smith et al 2010;Smith and Read 1997;Wu et al 2013). However, Auge (2004) has reviewed a large number of studies and showed that drought only affected levels of root Electronic supplementary material The online version of this article (doi:10.1007/s00572-014-0603-6) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

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Inoculation of drought-stressed strawberry with a mixed inoculum of two arbuscular mycorrhizal fungi: effects on population dynamics of fungal species in roots and consequential plant tolerance to water deficiency

et al. 2014

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The effect of inoculation with two arbuscular mycorrhizal fungi (AMF) on growth and drought tolerance of cultivated strawberry (Fragaria × ananassa) was studied. Three treatments (a single treatment either of Funneliformis mosseae BEG25, Funneliformis geosporus BEG11 or a 50:50 mixed inoculation treatment of both species) were compared to uninoculated plants. Species-specific primers for qPCR quantification of F. geosporus and F. mosseae DNA were developed to quantify the relative abundance of each fungus in roots of strawberry under different conditions of water stress. Co-occupation of the same root by both species was shown to commonly occur, but their relative abundance varied with water stress (reduced irrigation of up to 40%). Greater root colonisation was observed microscopically under water stress, but this increased colonisation was often accompanied with decreased amounts of fungal DNA in the root. F. mosseae tended to become more abundant under water stress relative to F. geosporus. There was significant correlation in the fungal colonisation measurements from the microscopic and qPCR methods under some conditions, but the nature of this relationship varied greatly with AMF inoculum and abiotic conditions. Single-species inoculation treatments gave similar benefits to the host to the mixed inoculation treatment regardless of irrigation regime; here, amount of colonisation was of greater importance than functional diversity. The addition of AMF inocula to plants subjected to reduced irrigation restored plant growth to the same or higher values as the non-mycorrhizal, fully-watered plants. The water use efficiency of plants was greater under the regulated deficit irrigation (RDI) regime and in AMF-inoculated plants, but there were no significant differences between plants inoculated with the single or combined inoculum. This study demonstrated that the increase in plant growth was directly influenced by an increase in root colonisation by AMF when individual plants were examined.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inoculation of drought-stressed strawberry with a mixed inoculum of two arbuscular mycorrhizal fungi: effects on population dynamics of fungal species in roots and consequential plant tolerance to water deficiency

et al. 2014

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“…However, we cannot rule out that the establishment of the exotic strains may have occurred, since we only used spore morphology for fungal identification. Actually, direct field inoculation with a mixture of F. mosseae and G. intraradices has been suggested to affect the diversity of AMF found in the roots of watermelon (Omirou et al 2013).…”

Section: Amf Inoculation and Root Colonizationmentioning

confidence: 99%

Contrasting effects of cover crops on ‘hot spot’ arbuscular mycorrhizal fungal communities in organic tomato

et al. 2014

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Arbuscular mycorrhizal fungal (AMF) communities are fundamental in organic cropping systems where they provide essential agro-ecosystem services, improving soil fertility and sustaining crop production. They are affected by agronomic practices, but still, scanty information is available about the role of specific crops, crop rotations and the use of winter cover crops on the AMF community compositions at the field sites. A field experiment was conducted to elucidate the role of diversified cover crops and AMF inoculation on AMF diversity in organic tomato. Tomato, pre-inoculated at nursery with two AMF isolates, was grown following four cover crop treatments: Indian mustard, hairy vetch, a mixture of seven species and a fallow. Tomato root colonization at flowering was more affected by AMF pre-transplant inoculation than by the cover crop treatments. An enormous species richness was found by morphological spore identification: 58 AMF species belonging to 14 genera, with 46 and 53 species retrieved at the end of cover crop cycle and at tomato harvest, respectively. At both sampling times, AMF spore abundance was highest in hairy vetch, but after tomato harvest, AMF species richness and diversity were lower in hairy vetch than in the cover crop mixture and in the mustard treatments. A higher AMF diversity was found at tomato harvest, compared with the end of the cover crop cycle, independent of the cover crop and pre-transplant AMF inoculation. Our findings suggest that seasonal and environmental factors play a major role on AMF abundance and diversity than short-term agronomic practices, including AMF inoculation. The huge AMF diversity is explained by the field history and the Mediterranean environment, where species characteristic of temperate and sub-tropical climates co-occur.

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Arbuscular Mycorrhizae Associations and Role in Mitigation of Drought Stress in Plants

2020

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Mycorrhizal inoculation affects arbuscular mycorrhizal diversity in watermelon roots, but leads to improved colonization and plant response under water stress only

Cited by 69 publications

References 56 publications

Inoculation of drought-stressed strawberry with a mixed inoculum of two arbuscular mycorrhizal fungi: effects on population dynamics of fungal species in roots and consequential plant tolerance to water deficiency

Inoculation of drought-stressed strawberry with a mixed inoculum of two arbuscular mycorrhizal fungi: effects on population dynamics of fungal species in roots and consequential plant tolerance to water deficiency

Contrasting effects of cover crops on ‘hot spot’ arbuscular mycorrhizal fungal communities in organic tomato

Arbuscular Mycorrhizae Associations and Role in Mitigation of Drought Stress in Plants

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