Isoxazolin-5-ones and Amino Acids in Root Exudates of Pea and Sweet Pea Seedlings

Abstract

Seeds of Pisum sativum L. cv Finale and Lathyrs odoratus L. cv Spencer were germinated asepticafly in moistened sand in the dark. At several stages, the amino acid composition of the exudate and of the corresponding roots was analyzed. A number of common amino acids, including homoser-ine, were exuded by the growing seeding root in an early stage and were partly reabsorbed later. A number of uncommon amino acids, including several isoxazolin-5-one derivatives, uracil alanines, ia-yglutamyl-D-ala-nine, and a-aminoadipic acid were exuded at different rates.