Cui Jing, Lamade Emmanuelle, Tcherkez Guillaume. 2020. Potassium deficiency reconfigures sugar export and induces catecholamine accumulation in oil palm leaves. Plant Science, 300:110628, 10 p.
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Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q2, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY
Résumé : Metabolic effects of potassium (K) deficiency have been described for nearly 70 years but specific effects of low K availability on sugar composition, sugar export rate and its relationship with other leaf metabolites are not very well documented. Having such pieces of information is nevertheless essential to identify metabolic signatures to monitor K fertilization. This is particularly true in oil-producing crop species such as oil palm (Elaeis guineensis), which is strongly K-demanding and involves high sugar dependence for fruit formation because of low carbon use efficiency in lipid synthesis. Here, we used metabolic analyses, measured sugar export rates with 13C isotopic labeling and examined the effects of K availability on both leaflet and rachis sugar metabolism in oil palm seedlings. We show that low K leads to a modification of sugar composition mostly in rachis and decreased sucrose and hexose export rates from leaflets. As a result, leaflets contained more starch and induced alternative pathways such as raffinose synthesis, although metabolites of the raffinose pathway remained quantitatively minor. The alteration of glycolysis by low K was compensated for by an increase in alternative sugar phosphate utilization by tyrosine metabolism, resulting in considerable amounts of tyramine and dopamine.
Mots-clés Agrovoc : Elaeis guineensis, potassium, carence minérale, physiologie végétale, métabolisme des glucides, dopamine, feuille, culture d'arbre
Mots-clés géographiques Agrovoc : Australie
Mots-clés libres : Dopamine, Sugars, Potassium, Deficiency, Oil palm
Classification Agris : F61 - Physiologie végétale - Nutrition
F62 - Physiologie végétale - Croissance et développement
Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques
Auteurs et affiliations
- Cui Jing, ANU (AUS)
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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/597082/)
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