Polyamine metabolism during early germination of Triticum durum Desf. cv. Cappelli

Abstract

Changes in polyamine metabolism have been studied during early germination of Triticum durum Desf. cv. Cappelli. In the embryos of dry seeds, the adequate polyamine content decreases with a minimum at 36 h of water imbibition. A great need for polyamines during germination is expressed by reactivation of their biosynthetic enzymes. Putrescine biosynthesis mostly occurs via the ornithine–decar–boxylase pathway until 42 hours of hydration. Arginine–decarboxylase activity, almost absent in the first stages of imbibition, reaches its maximal level around 36–42 hours, when ornithine–decarboxylase falls. These changes suggest that the polyamine metabolism could be differently activated depending on the growth process related to the germination phases.

Key Words:

• Arginine-decarboxylase
• germination
• ornithine-decarboxylase
• polyamines
• Triticum durum