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中文摘要：
以二叶期水稻幼苗为试验材料,研究其在15%PEG6000模拟的水分胁迫下脯氨酸积累及代谢关键酶活性变化,结果表明：叶片和根系中脯氨酸含量在胁迫后快速积累,胁迫24 h达到最大值,随后逐渐降低;控制脯氨酸合成的关键酶吡咯啉-5-羧酸合成酶（P5CS）和鸟氨酸转氨酶（δ-OAT）活性都呈现先升后降的变化趋势,而控制脯氨酸降解的关键酶脯氨酸脱氢酶（ProDH）活性呈现先降后升的变化趋势。
英文摘要：
Using rice seedlings at two-leaf stage as tested materials,the free proline content and activities of enzymes involved in proline metabolism were studied under water stress induced by 15%PEG.The results showed that the proline content increased obviously under stress,reached the maximum after 24 h and then decreased.The activities of △1-pyrroline-5-carboxylate synthetase（P5CS） and ornithine-δ-aminotransferase（δ-OAT）,the key enzymes of proline accumulation,increased significantly and then declined;while the activity of proline dehydrogenase（ProDH）,a key enzyme of proline degradation,declined significantly and then increased.
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