Piotr Kubiak

1 INTRODUCTION The ubiquitin-proteasome system (UPS) dynamically controls protein abundance to maintain cellular homeostasis. In plants, the UPS controls a range of cellular processes such as growth, development and stress responses by regulating the synthesis, action and crosstalk of hormones. The plant hormone ethylene is highly dependent on the ubiquitin system (Wang et al. 2004; Christians et al. 2009; Cai et al. 2018; Shan et al. 2020).

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