Journal
PLANT CELL AND ENVIRONMENT
Volume 42, Issue 3, Pages 998-1018Publisher
WILEY
DOI: 10.1111/pce.13494
Keywords
abiotic stress; Arabidopsis thaliana; biotic stress; drought stress; growth-defence trade-off; light stress; nutrient stress; priming; temperature stress
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [CRC973, Schm 814/29-1]
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The phytohormone cytokinin was originally discovered as a regulator of cell division. Later, it was described to be involved in regulating numerous processes in plant growth and development including meristem activity, tissue patterning, and organ size. More recently, diverse functions for cytokinin in the response to abiotic and biotic stresses have been reported. Cytokinin is required for the defence against high light stress and to protect plants from a novel type of abiotic stress caused by an altered photoperiod. Additionally, cytokinin has a role in the response to temperature, drought, osmotic, salt, and nutrient stress. Similarly, the full response to certain plant pathogens and herbivores requires a functional cytokinin signalling pathway. Conversely, different types of stress impact cytokinin homeostasis. The diverse functions of cytokinin in responses to stress and crosstalk with other hormones are described. Its emerging roles as a priming agent and as a regulator of growth-defence trade-offs are discussed.
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