What is the role of putrescine accumulated under potassium deficiency ?

Cui Jing, Pottosin Igor, Lamade Emmanuelle, Tcherkez Guillaume. 2020. What is the role of putrescine accumulated under potassium deficiency ?. Plant, Cell and Environment, 43 (6) : 1331-1347.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : 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 putrescine under K+ deficiency have been suggested, such as cation balance, antioxidant, reactive oxygen species (ROS) mediated signaling, osmolyte, or pH regulator. However, the specific association of putrescine build‐up with low K+ availability in plants remains poorly understood, and possible regulatory roles must be consistent with putrescine concentration found in plant tissues. We hypothesize that massive increase of putrescine upon K+ starvation plays an adaptive role. A distinction of putrescine function from that of other polyamines (spermine, spermidine) may be based either on its specificity or (which is probably more relevant under K+ deficiency) on a very high attainable concentration of putrescine, which far exceeds those for spermidine and spermine. Excessive putrescine and its catabolites appear to possess a strong potential in controlling cellular K+ and Ca2+, and mitochondria and chloroplasts bioenergetics under K+ stress.

Mots-clés Agrovoc : putrescine, potassium, carence minérale, carence du sol, carence en substance nutritive, organisme indicateur, biochimie, métabolite

Mots-clés complémentaires : Marqueur biochimique

Mots-clés libres : Putrescine, Potassium deficiency, Sunflower, Oil palm, Bioindicator

Classification Agris : P34 - Biologie du sol
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Auteurs et affiliations

• Cui Jing, ANU (AUS)
• Pottosin Igor, Universidad de Colima (MEX)
• Lamade Emmanuelle, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA) ORCID: 0000-0002-4909-0997
• Tcherkez Guillaume, ANU (AUS) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/595074/)

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