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Manganese Deficiency, Soil Chemistry, and Root Dysfunction Drive Physiological and Metabolic Changes in Date Palm Under Field Conditions.

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Titel: Manganese Deficiency, Soil Chemistry, and Root Dysfunction Drive Physiological and Metabolic Changes in Date Palm Under Field Conditions.
Autoren: Ben Maachia, Sihem1 (AUTHOR), Namsi, Ahmed2 (AUTHOR) anamsi@kfu.edu.sa
Quelle: Agronomy. Nov2025, Vol. 15 Issue 11, p2490. 18p.
Schlagwörter: *MANGANESE, *SOIL chemistry, *PHYSIOLOGY, *SOIL microbial ecology, *METABOLIC reprogramming, *CHLOROPHYLL spectra, *DATE palm, *ROOT diseases
Abstract: Manganese (Mn) deficiency is a major factor underlying brittle leaf disease in date palm, yet its root-centered mechanisms under field conditions remain poorly understood. Nine mature palms (three per health category: healthy, asymptomatic Mn-deficient, and BLD-affected) were assessed for soil chemistry (pH, salinity), root Mn concentration and hydraulics, canopy pigments and chlorophyll fluorescence (Fv/Fm), as well as metabolic responses. Elevated soil pH and variable salinity significantly constrained root Mn uptake and water conductance, leading to a ~60% decline in root Mn, a 20% reduction in root water content, an 80% loss of chlorophyll, and a 26% decrease in Fv/Fm. These changes induced strong metabolic reprogramming, including a twofold rise in glucose, increased protein content, and a tenfold enhancement in peroxidase activity. Asymptomatic palms already displayed early declines in pigments and fluorescence, highlighting their diagnostic value. This study demonstrates that soil-driven Mn deficiency impairs root function and cascades to canopy physiology and metabolism, offering realistic avenues for rhizosphere management and early field diagnosis in arid oases. [ABSTRACT FROM AUTHOR]
Datenbank: Academic Search Index
Beschreibung
Abstract:Manganese (Mn) deficiency is a major factor underlying brittle leaf disease in date palm, yet its root-centered mechanisms under field conditions remain poorly understood. Nine mature palms (three per health category: healthy, asymptomatic Mn-deficient, and BLD-affected) were assessed for soil chemistry (pH, salinity), root Mn concentration and hydraulics, canopy pigments and chlorophyll fluorescence (Fv/Fm), as well as metabolic responses. Elevated soil pH and variable salinity significantly constrained root Mn uptake and water conductance, leading to a ~60% decline in root Mn, a 20% reduction in root water content, an 80% loss of chlorophyll, and a 26% decrease in Fv/Fm. These changes induced strong metabolic reprogramming, including a twofold rise in glucose, increased protein content, and a tenfold enhancement in peroxidase activity. Asymptomatic palms already displayed early declines in pigments and fluorescence, highlighting their diagnostic value. This study demonstrates that soil-driven Mn deficiency impairs root function and cascades to canopy physiology and metabolism, offering realistic avenues for rhizosphere management and early field diagnosis in arid oases. [ABSTRACT FROM AUTHOR]
ISSN:20734395
DOI:10.3390/agronomy15112490