Participation of abscisic acid and gibberellins produced by endophytic Azospirillum in the alleviation of drought effects in maize

By A. Cohen, C. Travaglia, R. Bottini, P. Piccoli. 2009

318 citations recorded by the source corpus.

Azospirillum spp. are plant growth promoting bacteria (PGPB) that enhance growth by several mechanisms, including the production of phytohormones such as abscisic acid (ABA), indole-3-acetic acid (IAA), and gibberellins (GAs). Their presence may also alleviate plant water stress. In the present paper, the effects of Azospirillum lipoferum in maize (Zea mays L.) plants treated with inhibitors of ABA and GA synthesis, fluridone (F) and prohexadione-Ca (P), respectively, and either submitted to drought stress or provided sufficient water, were analysed. Fluridone diminished the growth of plants that had been well watered, in a manner similar to drought, but inoculation with Azospirillum completely reversed this effect. The relative water content of the F-treated and drought-stressed plants was significantly lower (even though drought-stressed plants had been allowed to recover for one week), and this effect was completely neutralized by Azospirillum. These results were correlated with ABA levels assessed by ...

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/f596cb4f3b7f5974ac1950984392e606f3747440

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In Plant Science

1. M. S. Khan
2. A. Zaidi
3. Ees Ahmad
4. J. Kloepper
5. Esther N. Ngumbi
6. Suhas P. Wani
7. M. Kaushal
8. B. R. Glick

Citations in the corpus

• Mechanisms of plant response to salt and drought stress and their alteration by rhizobacteria (2016, background): “In other experiments, treating maize plants with fluridone (an inhibitor of ABA synthesis) inhibited plant growth in a manner analogous to drought stress (Cohen et al. 2009).”
• Enhancement of drought stress tolerance in crops by plant growth promoting rhizobacteria. (2016, background): “Azospirillum lipoferum Maize Gibberellins increased ABA levels and alleviated drought stress Cohen et al. (2009) Azospirillum sp. Wheat IAA enhanced root growth, lateral roots formation and increased uptake of water and nutrients under drought stress Arzanesh et al. (2011) Phyllobacterium…”
• Rhizobacterial-plant interactions: Strategies ensuring plant growth promotion under drought and salinity stress (2016, background): “Production of GAs by Azospirillum lipoferum in inoculated maize plants conferred drought tolerance (Cohen et al., 2009).”
• The evolution of abscisic acid (ABA) and ABA function in lower plants, fungi and lichen (2010, background): “(2007) detected ABA in isolated strains of endophytic bacteria in roots of Helianthus annuus and Cohen et al. (2009) found ABA in Azospirillum brasiliense.”
• Plant-growth-promoting rhizobacteria: drought stress alleviators to ameliorate crop production in drylands (2015, background): “Production of ABA and gibberellins by Azospirillum lipoferumalleviated drought stress in maize plants (Cohen et al. 2009).”
• Chapter Two – How the Plant Growth-Promoting Bacterium Azospirillum Promotes Plant Growth—A Critical Assessment (2010, unknown): “The results suggest that ABA and GAs participate in alleviating water stress of plants by the presence of A. lipoferum (Cohen et al., 2009).”
• Bacterial-mediated drought tolerance: Current and future prospects (2016, background): “Such modifications include decreasing ET production (Glick et al., 1998; Belimov et al., 2009) and changing the balance of CKs and ABA (Figueiredo et al., 2008; Cohen et al., 2009) or IAA signaling (Contesto et al., 2010).”
• Soil microbiomes and climate change (2019, unknown): “Some endophytic strains of Azospirillum were demonstrated to control stomatal closure in maize through signal transduction routes regulated by production of gibberellins 100 .”