Improving germination and growth performances of millet grown under saline conditions through seed priming

Hasna Ellouzi; Souhir Amraoui; Mohsen Hanana

doi:10.56027/JOASD.302023

Auteurs-es

Hasna Ellouzi
Souhir Amraoui
Mohsen Hanana CBBC

DOI :

https://doi.org/10.56027/JOASD.302023

Mots-clés :

Germination, growth, hormo-priming, osmo-priming, salt stress, priming

Résumé

L’amorçage (priming) est une technique de traitement pré-germinatif qui consiste à imbiber la semence puis à la re-déshydrater avant la percée de la radicule. Notre travail consiste à étudier l’effet de deux agents de prétraitement des graines, notamment le PEG (20%) et l’AG₃ (50 ppm) sur les performances germinatives, la croissance et l’hydratation des plantules de mil cultivées en présence de 100 mM NaCl. Notre objectif principal consiste à améliorer le phénotype et le comportement du mil cultivé sous contrainte saline via l’optimisation de l’amorçage des semences. Les résultats obtenus montrent que tous les types d’amorçage ont un effet bénéfique. Toutefois, le prétraitement des graines avec l’AG₃ semble fortement associé à des processus mettant en jeu la croissance. Ce composé stimule de 100% la germination dès le 6^ème jour de mise en germination en milieu salin. Cet effet est accompagné d’une amélioration de la croissance (193%) et d’une meilleure hydratation (330%), relativement aux plantes témoins. Cette réponse est primordialement liée à une capacité de détecter rapidement le stress salin et de le rendre facilement interprétable et même bénéfique pour sa croissance en milieux extrêmes.

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