小麦籽粒游离氨基酸的百分含量在开花后4～12天急剧增加;然后又迅速下降直到成熟。以籽粒为单位表示的各氨基酸含量均在开花后16～32天处于较高水平。丙氨酸、谷氨酸和丝氨酸是游离氨基酸库的主要组分,脯氨酸在开花后8～12天增长较多,甘氨酸从16天后有明显增加,其余氨基酸变化不大。结果表明,小麦籽粒游离氨基酸含量随着组分的变更而变化,不同氨基酸在籽粒发育的不同时期达到一个最高值。这些占优势的游离氨基酸可能为蛋白质合成所需的其它氨基酸的代谢提供氮源。 The percentage of free amino acids in wheat grains increases sharply from 4 to 12 days after flowering; it then decreases rapidly until it matures. The content of each amino acid expressed in grain was higher at 16 ~ 32 days after flowering. Alanine, glutamic acid and serine are the main components of the free amino acid pool. Proline increased more from 8 to 12 days after flowering, glycine increased obviously from 16 days after flowering, while the remaining amino acids did not change much. The results showed that the content of free amino acids in wheat grains changed with the change of components, and different amino acids reached the highest value in different stages of grain development. These predominant free amino acids may provide a source of nitrogen for the metabolism of other amino acids required for protein synthesis.