Effects of rice cultivar, additional fertilizer application, and harvest time on 4-aminobutyric acid (GABA) content of brown rice: Potential improvements to GABA-enriched supplementary foods
2015
Saikusa, T. (NARO Agricultural Research Center, Tsukuba (Japan)) | Ishikawa, T. | Higuchi, K. | Ishida, M.
There is considerable demand for 4-aminobutyric acid (GABA)-enriched brown rice because GABA effectively decreases blood pressure and improves mental stability. We examined the effect of early harvesting and additional fertilizer application on the GABA content of rice cultivars with various genetic backgrounds-data applicable to the production of GABA-enriched processed rice foods. Early harvesting and additional fertilizer application at the panicle formation stage or at the full heading stage did not lead to an increase in GABA contents. However, large variations in GABA accumulation were observed among the different cultivars, and one (cv. Bekogonomi) was able to accumulate 40 mg/100 g of GABA. This result suggests that it is possible to develop new GABA-enriched rice cultivars without a large germ for the supplementary health food sector.
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