Abstract
The amino acid and sugar composition of sugar beet leaf tissue injured by Lygus disponsi were quantitatively and semiquantitatively analyzed. Thirteen amino acids and five undentified ninhydrin positive compounds were detected in the tissue. Concentrations of all thirteen amino acids increased remarkably in injured tissue, while the composition pattern of individual amino acids was found to be markedly different from that of uninjured tissue. Five kinds of sugars (including an unidentified sugar) were detected in injured tissue and all of these with the exception of glucose were more abundant in injured rather than uninjured tissue. The unidentified sugar was not detected in uninjured tissue. The relationship between the alteration of the pattern on these compounds in the tissue and the injury (leaf malformations) is discussed.
