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Comportement physiologique du sparte (Lygeum spartum L.) à la salinité
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ISBN10: 3838142233
ISBN13: 9783838142234
Publisher: Presses Academiques Francophones
Published: Mar 17 2025
Pages: 60
Weight: 0.21
Height: 0.14 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9783838142234
Publisher: Presses Academiques Francophones
Published: Mar 17 2025
Pages: 60
Weight: 0.21
Height: 0.14 Width: 6.00 Depth: 9.00
Language: French
Le sparte (Lygeum spartum L.) est une plante d'une grande valeur écologique (contre la désertification) et économique (surtout dans l'industrie papetière). Elle fait partie des espèces graminées vivaces des steppes nord africaines. Son comportement physiologique vis-à -vis du NaCl (0, 50 et 100 mM) a été étudié à la phase de germination et au stade jeune en milieu hydroponique et en conditions contrôlées. Le taux de germination des graines de L. spartum subit une diminution de 25% pour une concentration saline de 58 mM NaCl. Après deux semaines de traitement, seule la concentration de 100 mM réduit la croissance. Les potentiels osmotique (Ψπ) et hydrique (Ψω), associés à une importante accumulation de sodium (Na+) et de chlore (Cl-), sont fortement abaissés, alors que la turgescence (Ψτ) est restée stable. La glycine-bétaïne est accumulée à des quantités significatives en fonction de la concentration du NaCl appliquée, alors que l'accumulation des sucres ne contribue que faiblement à l'ajustement osmotique. Les essais menés au cours de cette expérimentation montrent que L. spartum est modérément tolérant à la salinité. Sa culture pourrait être donc envisagée dans les zones salées.
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