Elsevier

Current Opinion in Plant Biology

Volume 26, August 2015, Pages 106-112
Current Opinion in Plant Biology

Growth versus immunity  a redirection of the cell cycle?

https://doi.org/10.1016/j.pbi.2015.06.006Get rights and content
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Highlights

  • Immunity can reduce growth and yield of plants to a similar extent than diseases.

  • Energy reallocation does not account for immunity-triggered growth inhibition.

  • Immunity redirects hormone-mediated regulation of the root cell cycle.

  • Impairment of cell cycle might account for immunity-induced growth inhibition.

Diseases caused by plant pathogens significantly reduce growth and yield in agricultural crop production. Raising immunity in crops is therefore a major aim in breeding programs. However, efforts to enhance immunity are challenged by the occurrence of growth inhibition triggered by immunity that can be as detrimental as diseases. In this review, we will propose molecular models to explain the inhibitory growth-immunity crosstalk. We will briefly discuss why the resource reallocation model might not represent the driving force for the observed growth-immunity trade-offs. We suggest a model in which immunity redirects and initiates hormone signalling activities that can impair plant growth by antagonising cell cycle regulation and meristem activities.

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