Abstract
Abstract The effect of different nitrogen sources (urea, nitrate and ammonium) on the free amino acids and alkaloid content in leaves and roots of snapdragon (Antirrhinum majus) was studied. The nitrate treatment produced the highest plant dry weights, and urea the lowest. The all ammonium grown plants finished their biologic cycle one month earlier than the nitrate plants. Results indicate that the most abundant free amino acids are glutamic and aspartic acids and glutamine, which constituted for about 50% of the whole pool. Free methionine and cysteine are absent from both leaves and roots. The highest alkaloid levels occur for all tests during full flowering, the ammonium treated plants containing the most alkaloids.
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