Water availability and formation of propagules of arbuscular mycorrhizal fungi associated with sorghum

Silva, E.M.; Maia, Leonor Costa; Menezes, Karen M.S.; Braga, M. B.; Melo, Natoniel Franklin de; Yano‐Melo, Adriana Mayumi

doi:10.1016/j.apsoil.2015.05.004

Cited by 8 publications

(2 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar contrasting results were reported for spores production. Drought drastically decreased their number in Gigaspora albida and Scutellospora heterogama ( Silva et al, 2015 ), Entrophospora colombiana and Acaulospora longula , ( Sieverding and Toro, 1988 ), while no effects were noticed on Gigaspora margarita, Glomus clarum , and G. mosseae ( Sylvia and Schenck, 1983 ) under greenhouse pot experiments. Spore germination was also significantly decreased in the PEG 50 treatment as compared to the other treatments and germ tube length was significantly decreased at all PEG concentrations as compared to the Control -PEG treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, it was not possible to separate fungus from plant and thus direct from indirect effect on the fungus. Nevertheless, the authors suggested that the effects were due to a decrease of the carbon sink constituted by the plants ( Augé, 2001 ; Manoharan et al, 2010 ; Silva et al, 2015 ). In our study conducted strictly in vitro , thus avoiding any confounding effects, only the ERM of the fungus was exposed to a decrease in water availability.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Reducing Water Availability Impacts the Development of the Arbuscular Mycorrhizal Fungus Rhizophagus irregularis MUCL 41833 and Its Ability to Take Up and Transport Phosphorus Under in Vitro Conditions

Pioufle

Declerck

2018

Front. Microbiol.

View full text Add to dashboard Cite

Climate change scenarios predict a higher variability in rainfall and an increased risk of water deficits during summers for the coming decades. For this reason, arbuscular mycorrhizal fungi (AMF) and their mitigating effects on drought stress in plants are increasingly considered in crop management. However, the impact of a decrease in water availability on the development of AMF and their ability to take up and transport inorganic phosphorus (Pi) to their hosts remain poorly explored. Here, Medicago truncatula plantlets were grown in association with Rhizophagus irregularis MUCL 41833 in bi-compartmented Petri plates. The system consisted in associating the plant and AMF in a root compartment (RC), allowing only the hyphae to extend in a root-free hyphal compartment (HC). Water availability in the HC was then lowered by increasing the concentration of polyethylene glycol-8000 (PEG-8000) from 0 to 10, 25, and 50 g L-1 (corresponding to a slight decrease in water potential of -0.024, -0.025, -0.030, and -0.056 Mpa, respectively). Hyphal growth, spore production and germination were severely impaired at the lowest water availability. The dynamics of Pi uptake by the AMF was also impacted, although total Pi uptake evaluated after 24 h stayed unchanged. The percentage of metabolically active extraradical hyphae remained above 70%. Finally, at the lowest water availability, a higher P concentration was observed in the shoots of M. truncatula. At reduced water availability, the extraradical mycelium (ERM) development was impacted, potentially limiting its capacity to explore a higher volume of soil. Pi uptake was slowed down but not prevented. The sensitivity of R. irregularis MUCL 41833 to a, even small, decrease in water availability contrasted with several studies reporting tolerance of AMF to drought. This suggests a species or strain-dependent effect and support the necessity to compare the impact of water availability on morpho-anatomy, nutrient uptake and transport capacities of other, potentially more drought-tolerant (e.g., isolated from dry environments) AMF.

show abstract

Section: Discussionmentioning

confidence: 99%