Effects of two contrasted arbuscular mycorrhizal fungal isolates on nutrient uptake by Sorghum bicolor under drought

Mycorrhiza
Sarah SymanczikPierre-Emmanuel Courty

Abstract

Drought is a limiting factor for crop production, especially in arid and semi-arid climates. In this study, Sorghum bicolor plants were inoculated, or not, with Rhizophagus irregularis, an arbuscular mycorrhizal (AM) strain typical for temperate climates, or Rhizophagus arabicus, a strain endemic to hyper-arid ecosystems. Plants were grown under well-watered or drought conditions in compartmented microcosms. Transpiration rates, plant growth, and nutrient uptake (using 15N as a tracer) were determined to assess the impact of drought stress on sorghum plants in AM symbiosis. Although AM colonization did not affect the bulk biomass of host plants, R. arabicus improved their transpiration efficiency and drought tolerance more than R. irregularis. Moreover, R. arabicus was able to extract more 15N from the soil under both water regimes, and AM-driven enhancement of the nitrogen and phosphorus content of sorghum, especially when water was limiting, was greater for R. arabicus-inoculated plants than for R. irregularis-inoculated plants. Our work demonstrates close links between AM hyphal phosphorus and nitrogen transport and uptake by AM plants for both AM fungal species. It also underscores that, under the drought stress conditions ...Continue Reading

References

Jul 10, 2002·Annals of Botany·J L ArausC Royo
Oct 12, 2004·Journal of Experimental Botany·M M Chaves, M M Oliveira
Feb 14, 2006·Journal of Plant Physiology·Keunho ChoRobert M Augé
Sep 17, 2008·Nature Reviews. Microbiology·Martin Parniske
Feb 4, 2009·Nature·Andrew H PatersonDaniel S Rokhsar
Jun 14, 2013·Plant Signaling & Behavior·Sally KoegelPierre-Emmanuel Courty
Mar 1, 2003·Functional Plant Biology : FPB·Manuela M ChavesJoão S Pereira

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Citations

Mar 8, 2019·The New Phytologist·Daniel WipfPierre-Emmanuel Courty
Oct 16, 2021·Journal of Applied Microbiology·Zahra Ezzati LotfabadiAli Mohammadi Torkashvand

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