Polyamines (PAs), such as putrescine, spermidine, and spermine, are essential for plant growth and development. Huang et al. demonstrate that the COP9 SIGNALOSOME SUBUNIT 5A (FvCSN5A) mediates the degradation of the POLYAMINE OXIDASE 5 (FvPAO5), which catalyzes the conversion of spermidine and spermine to produce H₂O₂ in strawberry (Fragaria vesca). The proposed CSN5A-CUL1-PAO5 signaling pathway suggests that FvCSN5A regulates polyamine and H₂O₂ homeostasis in strawberries, thereby fine-tuning plant growth and fruit ripening. The cover image depicts the simultaneous presence of leaves, flowers, and fruits in the FvCSN5A RNAi transgenic plant, illustrating the dynamic changes in strawberry plant development and fruit ripening. Image credit: Fan Gao and Jiaxuan Guo.

A photo of tomatoes growing on a vine. Melatonin improves saline-alkali tolerance of tomato by alleviating proteome S-nitrosylation, especially the HA2 at Cys206, which alters HA2-TFT1 interaction, HA activity, and H+ efflux in roots. See the recent paper by Wei et al, https://doi.org/10.1093/plcell/koaf035. Photo by gibblesmash asdf on Unsplash.