Thirsty for solutions How potassium drives sugarcane's varietal-specific strategies for drought tolerance

Thirsty for solutions : How potassium drives sugarcane's varietal-specific strategies for drought tolerance

Copyright © 2025 Elsevier Masson SAS. All rights reserved.

Bibliographische Detailangaben
Veröffentlicht in:Plant physiology and biochemistry : PPB. - 1991. - 223(2025) vom: 25. Juni, Seite 109791
1. Verfasser: Lavres, José (VerfasserIn)
Weitere Verfasser: Alves, Fernanda Viginotti, Mateus, Nikolas Souza, Oliveira, Jessica Bezerra, Nerastri, Laura Panzarin, Gaziola, Salete Aparecida, Mazzafera, Paulo, Azevedo, Ricardo Antunes, Jordan-Meille, Lionel
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2025
Zugriff auf das übergeordnete Werk:Plant physiology and biochemistry : PPB
Schlagworte:Journal Article Drought tolerance Metabolic profile Nutritional efficiency Photosynthetic system Saccharum spp. Potassium RWP5GA015D Water 059QF0KO0R Antioxidants
Beschreibung
Zusammenfassung:Copyright © 2025 Elsevier Masson SAS. All rights reserved.
With increasing drought stress impacting plants during critical growth stages, genetic breeding and nutrient management are key strategies for plant's resilience. To investigate how potassium (K) fertilization and drought stress impact biochemical, physiological and nutritional mechanisms of sugarcane, we applied a multitiered approach at a range of leaf- and plant-levels in four sugarcane varieties (IACSP95-5000, CTC7, CTC14, and RB975201) grown under two K-soil availability levels (moderate - MK; high K - HK) and two water regimes (well-watered - WW; drought-stressed - DS). DS reduced leaf water potential at predawn (Ψpd) and midday (Ψmd), and photosynthetic parameters, including CO2 assimilation (A), stomatal conductance (gs), transpiration (E), instantaneous carboxylation efficiency (k), and Fv/Fm. In contrast, DS enhanced K-uptake efficiency (KUpE), oxidative stress (indicated by H2O2 and MDA), and enzymatic antioxidant activities (SOD, CAT, APX, GPX). Regarding K-soil availability levels, the HK increased K-uptake efficiency (KUpE) and K-accumulation, which enhanced photosynthetic parameters, enzymatic antioxidant activities and biomass production, while reduced leaf δ13C and oxidative stress relative to MK, regardless the water regimes. Plants under DS x HK showed distinct leaf metabolic profiles, being characterized by the accumulation of stress-resilient metabolites, including organic acids (aconitic, aspartic, benzoic glutonic malic and valeric acid), sugars (ribulose, hexopyranose and turanosis), amino acids (alanine), and polyamines (putrescine), notably in CTC7 variety. Our findings illustrate that enhanced K-accumulation observed in plants under HK (especially in CTC7 variety) supports drought resilience across varieties by upregulating biochemical, physiological and nutritional mechanisms
Beschreibung:Date Completed 20.05.2025
Date Revised 20.05.2025
published: Print-Electronic
Citation Status MEDLINE
ISSN:1873-2690
DOI:10.1016/j.plaphy.2025.109791