中文摘要：

选用云南和浙江近期育成的γ-氨基丁酸（GABA）含量差异较大的水稻品种（系）26个，在云南新甲相同栽培条件下种植，比较研究其稻谷和糙米不同发芽时间对不同部位GABA含量累积的差异。结果表明：供试26个品种（系）以滇农S-1／滇靖8号、HIPj1、文稻1号／IR36、和文稻2号／IR36四个品种（系）GABA含量最高；萌发前GABA含量各部位依次为皮胚〉颖壳〉糙米〉精米。萌发活化24-28h能显著促进萌发稻谷和糙米中GABA含量的累积，呈现先升高后降低的变化趋势，尤其是糙米在萌发后24h达到最高峰值。稻谷和糙米萌发后不同的部位GABA的累积速率和累积量不同，各部位GABA含量依次为：胚芽〉糙米〉精米，颖壳最低；萌发活化后GABA含量累积呈现糙米大于稻谷；胚芽中GABA含量粳稻高于籼稻。

英文摘要：

The content of γ-aminobutyric acid （ γ-GABA）, one of the main functional components in rice, changes with the parts and the germination periods of rice. This study aimed to analyze the changes in γ-GABA content in differert parts of rice and brown rice of 26 varieties （containing 12 japonica varieties and 14 indica varieties） that have been recently bred in Yunnan province or Zhejiang province and were grown in Xinping county in Yunnan province during germination. The results showed that Diannong S- 1/Dianjing 8, HIPj 1, Wendaol/IR 36 and Wendao 2/IR 36 had the highest γ -GABA content among the 26 rice varieties; the γ -GABA contents in different parts office before germination decreased in the following order： rice germ 〉 rice husk 〉 brown rice 〉 polished rice; the germination activation for 24 -- 28 h could significantly promote the accumulation of γ -GABA in rice and brown rice, showing a trend of first increase and then decrease, and the γ -GABA content in brown rice reached maximum at 24 h of germination; the accumulation rate and quantity in different parts of germinated rice and germinated brown rice were different, and the y -GABA contents in different parts decreased in the following order： rice germ 〉 brown rice 〉 polished rice 〉 rice husk; after germination activation, the y -GABA accumulation quantity in brown rice was more than that in rice, and the average content of γ -GABA in rice germ of 12 japonica varieties was higher than that of 14 indica varieties.