Abstract
Concentrations of agmatine, coumarylagmatine and the antifungal hordatines in the shoots of barley seedlings have been determined at various stages of growth. Coumarylagmatine declined with age on a fresh weight basis, both in diurnal illumination and in continuous darkness. Hordatines A and B (estimated together) declined in the light to the 30th day after germination but their concentrations were stable in the dark to the 12th day. Hordatine M declined in the light to the 30th day and in the dark to the 12th day from germination. Agmatine declined in both light and dark to the 12th day. On the 30th day from germination potassium deficiency caused an increase in hordatines A + B ( × 6), hordatine M ( × 2) and agmatine ( × 13). Infection of the 11-day-old seedlings with mildew ( Erysiphe graminis) caused an increase in the content of hordatine A + B ( × 6), hordatine M ( × 2) and agmatine ( × 2) 13 days later. Hordatines occurred in seedlings of H. bulbosum, H. distichon, H. murinum and H. spontaneum, though not in seedlings of H. jubatum, maize, millet, oats, rice, rye or wheat. Arginine decarboxylase activity declined with age in barley seedlings grown in the light or dark from the 3rd to the 12th day.
Published Version
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