Abstract
Aluminium (Al) is one of the most abundant metals in earth crust, which becomes toxic to the plants growing in acidic soil. Phytohormones like ethylene, auxin, cytokinin, abscisic acid, jasmonic acid and gibberellic acid are known to play important role in regulating Al toxicity tolerance in plants. Exogenous applications of auxin, cytokinin and abscisic acid have shown significant effect on Al-induced root growth inhibition. Moreover, ethylene and cytokinin act synergistically with auxin in responding against Al toxicity. A number of studies showed that phytohormones play vital roles in controlling root responses to Al toxicity by modulating reactive oxygen species (ROS) signalling, cell wall modifications, organic acid exudation from roots and expression of Al responsive genes and transcription factors. This review provides a summary of recent studies related to involvement of phytohormone signalling and cross-talk with other pathways in regulating response against Al toxicity in plants.
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Acknowledgements
AR acknowledges Senior Research Associateship under scientists' pool scheme by Council of Scientific and Industrial Research (CSIR), India. RS acknowledge funding under BioCARe program of Department of Biotechnology (DBT), Government of India. AKS thanks Indian Council of Agricultural Research (ICAR), India and DBT, Government of India for funding.
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AR and AKS conceived the idea. AR and RS collected the literature and wrote the manuscript. SKB and SKL edited the manuscript. AKS edited and finalized the manuscript.
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Ranjan, A., Sinha, R., Lal, S.K. et al. Phytohormone signalling and cross-talk to alleviate aluminium toxicity in plants. Plant Cell Rep 40, 1331–1343 (2021). https://doi.org/10.1007/s00299-021-02724-2
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DOI: https://doi.org/10.1007/s00299-021-02724-2