THE UTILIZATION OF SINGLE ORGANIC NITROGEN COMPOUNDS BY WHEAT SEEDLINGS AND BY PHYTOPHTHORA PARASITICA

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Abstract
The growth of wheat seedlings under aseptic conditions is shown to be well supported by L-alanine, glycine, and urea, but not so well as by nitrate. On the other hand, D-alanine and the optical isomers of leucine exerted toxic effects; seedling growth in these solutions was less than in the cultures receiving no nitrogen, and the presence of nitrate in the nutrients did not reduce their toxic effects. However, the toxic effect of D-alanine was partially offset by L-alanine. A somewhat parallel influence upon the growth of wheat seedlings and P. parasitica was exerted by D- and L-alanine, D- and L-leucine, and glycine, but not by urea. The latter poorly supported the fungus although it helped the growth of wheat. D-leucine is more toxic to P. parasitica than L-leucine, less toxic to wheat seedlings as measured by growth inhibition, but more toxic as measured by chlorotic lesions in the foliage.

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