Effects of Exobasidium vexans Massee on Free Amino Acid Composition and Content of Camellia sinensis (Linn) var. Assamica (Masters) Kitamura
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Abstract:
To explore the effects of Exobasidium vexans Massee (E. vexans) on the amino acid composition and content of Camellia Sinensis (Linn.) var. assamica (Masters) Kitamura, infected and healthy leaves from three Camellia sinensis (L.) Kuntze varieties with different resistance were used as experimental materials, and high-performance liquid chromatography (HPLC) was conducted to measure the amino acid composition and content of the infected and healthy leaves from the tea trees with different resistance. The results showed that there were differences in the concentrations and types of free amino acids among healthy leaves from different resistant varieties. Theanine had the highest concentration, followed by γ-aminobutyric acid, methionine, and cystine. After infection, total amino acid content increased; in the leaves of ZiJuan-the variety with high resistance to E. vexans-the concentrations and diversity of free amino acids decreased, and only the concentration of γ-aminobutyric acid increased; in the leaves of YunKang10-the variety with medium resistance to E. vexans-the concentrations and diversity of free amino acids increased; in the leaves of susceptible variety FoXiang1, the diversity of free amino acids did not change, the concentrations of γ-aminobutyric acid, theanine, lysine, tryptophan, and arginine increased, and concentrations of the other amino acids decreased. Therefore, the above findings can be used to analyze the relation between amino acids and disease resistance of tea trees. The results of this study provide basic data for the research on the pathogenicity of E. vexans from physiological and biochemical points of view.
