What is the role of putrescine accumulated under potassium deficiency?

@article{Cui2020WhatIT,
  title={What is the role of putrescine accumulated under potassium deficiency?},
  author={Jing Cui and Igor Pottosin and Emmanuelle Lamade and Guillaume Tcherkez},
  journal={Plant, cell \& environment},
  year={2020}
}
Biomarker metabolites are of increasing interest in crops since they open avenues for precision agriculture, whereby nutritional needs and stresses can be monitored optimally. Putrescine has the potential to be a useful biomarker to reveal potassium (K+ ) deficiency. In fact, although this diamine has also been observed to increase during other stresses such as drought, cold or heavy metals, respective changes are comparably low. Due to its multifaceted biochemical properties, several roles for… 

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