Abstract
Five varieties of eggplants (Solanum melongena L. ‘Kumamoto-naga’, ‘Kitta’, ‘Black Beauty’, ‘Singhnath’, and ‘Chikuyou’) were used in this study. Four varieties of eggplants (‘Kumamoto-naga’, ‘Kitta’, ‘Black Beauty’, and ‘Singhnath’) were tested to examine the influence of the light environment on anthocyanin pigment, sugar and organic acid contents in fruits. Anthocyanin pigment content was affected by the dark treatment on fruit in ‘Kumamoto-naga’ and ‘Kitta’; however, the some content in ‘Black Beauty’ and ‘Singhnath’ was not affected. The sugar was composed of glucose, fructose and less sucrose, and the organic acid was composed of malic acid and less citric acid in fruits. Sugar and organic acid contents were not affected in ‘Kumamoto-naga’ and ‘Black Beauty’. In ‘Singhnath’ and ‘Kitta’, there were the components that increased with dark treatment. In addition, two cultivars (‘Kumamoto-naga’ and ‘Chikuyou’) were grown in summer and autumn periods, and the effect of the fertilizer application on the anthocyanin pigments, sugar, organic acid and amino acid contents in the fruit were examined. ‘Chikuyou’ had a higher content of anthocyanin than ‘Kumamoto-naga’, and ‘Chikuyou’ contained more anthocyanin in autumn than in summer. In ‘Kumamoto-naga’, sucrose increased more in autumn than in summer, and malic acid increased as the concentration of nutrient solution applied increased. Fourteen amino acids were detected and the major amino acids were glutamine, γ-aminobutyric acid, asparagine, and arginine. Two cultivars contained considerably higher total amino acids in autumn than in summer.
https://ror.org/05aymst21 
