干旱胁迫对芝麻幼苗生理生化指标的影响

为探明干旱胁迫对不同芝麻生理特性的影响,以干旱敏感材料g76和高抗旱材料柳林芝麻3号作为试验材料,对苗期芝麻进行干旱胁迫。结果表明,随着干旱胁迫时间的延长,2个芝麻材料幼苗的游离脯氨酸（Pro）含量均呈现上升趋势,其中g76在干旱处理后Pro含量增加较为平缓,而柳林芝麻3号在干旱处理3d时Pro含量迅速增加,随后平稳增加。2个芝麻材料幼苗的丙二醛（MDA）含量随着干旱时间的延长均呈现逐步上升的趋势,其中柳林芝麻3号MDA含量增加较为平缓,而g76在干旱处理3d时MDA含量迅速增加,随后平稳增加。2个芝麻材料幼苗的超氧化物歧化酶（SOD）活性在干旱处理期间均持续上升,柳林芝麻3号在干旱处理3d时SOD活性增加较为迅速,随后平稳增加,而g76在干旱处理6d时SOD活性增加较为迅速,随后平稳增加。2个芝麻材料幼苗的过氧化氢酶（CAT）活性在干旱处理期间呈现先上升后下降的趋势,其中g76在干旱处理6d时达到最大值,而柳林芝麻3号在干旱处理9d时CAT活性达到最大值。

Effects of Drought Stress on Physiological and Biochemical Indexes of Sesame Seedlings

To find out the effects of drought stress on the physiological and biochemical characteristics of different sesame, high drought-resistant material Liulin 3 and drought-sensitive material g76 were used as experimental materials to induce drought stress in the seedling stage. The results showed that with the extension of drought stress time, the proline contents of the two sesame materials showed an upward trend. Among them, the proline content of g76 increased gently after drought treatment, while the proline content of Liulin 3 increased rapidly at three days of drought treatment and then increased steadily. The malondialdehyde (MDA) contents of the two sesame materials showed a trend of gradual increase with the extension of drought time, the content of MDA of high drought-resistant material increased slowly, while the content of MDA of drought-sensitive material increased rapidly at three days of drought treatment and then increased steadily. The activities of superoxide dismutase (SOD) of the two sesame materials continued to increase during the drought treatment. The SOD activity of Liulin 3 increased rapidly at three days of drought treatment and then increased steadily, while the SOD activity of g76 increased rapidly at six days of drought treatment and then increased steadily. The catalase activities of the two sesame materials showed an increasing trend first and then decreasing during drought treatment. The g76 reached the maximum value at six days of drought treatment and Liulin 3 reached the maximum value at nine days of drought treatment.