| 葛体达,隋方功,白莉萍,吕银燕,周广胜.长期水分胁迫对夏玉米根叶保护酶活性及膜脂过氧化作用的影响[J].干旱地区农业研究,2005,(3):18~23 |
| 长期水分胁迫对夏玉米根叶保护酶活性及膜脂过氧化作用的影响 |
| Effects of long-term water stress on protective enzyme activities and lipid peroxidation in summer maize roots and leaves |
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| DOI：10.7606/j.issn.1000-7601.2005.03.04 |
| 中文关键词: 水分胁迫 玉米 保护酶活性 膜脂过氧化 |
| 英文关键词:water stress maize protective enzyme activities lipid peroxidation |
| 基金项目:国家重点基础研究发展规划(973)项目(G1999043407) |
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| 中文摘要: |
| 利用防雨旱棚研究了水分胁迫对夏玉米根系及叶片保护酶活性及脂膜过氧化作用的影响。结果表明在水分胁迫下,玉米根系与叶片保护酶SOD、CAT、POD活性均在生长发育前中期显著升高而后期下降。即保护酶系统对水分胁迫响应的策略不同,前中期如大口期和抽雄前期主要表现为积极应对,后期如灌浆期和乳熟期主要表现为被动忍耐;根系SOD、CAT和POD活性小于叶片。SOD、CAT、POD活性对水分胁迫的敏感程度不同,SOD对水分胁迫不敏感,水分胁迫后期,SOD仍有较高活性,POD活性则明显降低。膜脂过氧化产物MDA含量随水分胁迫程度加剧而增加,且根系MDA含量小于叶片MDA含量。在水分胁迫下,叶片与根系的可溶性蛋白质含量降低。研究还表明,在水分胁迫下,玉米根系保护酶活性及膜脂过氧化作用对水分胁迫的反应与叶片保护酶活性及膜脂过氧化作用对水分胁迫的反应呈正相关关系,且绝大多数的相关系数达显著或极显著水平。 |
| 英文摘要: |
| Using rain proof installations, a systematic study was conducted to determine the effects of water stress on protective enzyme activities and lipid peroxidation. The results showed that, under water stress, activities of superoxide dismutase(SOD), catalase(CAT), and peoxidase(POD) in leaves and roots increased sharply at prophase and metaphase such as male tetrad stage, while declined at the evening growth stages such as milky stage. Different responses of maize to water stress under field conditions were found at different growing stages. At the stage of male tetrad and the pre-tasselling, the mechanism of response to drought is active, while at the stage of filling and milking is forbearing negatively. The protective enzyme activities in roots are lower than that in leaves, but the sensitive degree of these enzymes to water stress is different. SOD activities are less sensitive under drought stress compared with other protective enzymes. The content of malondialdehyde (MDA) is increased under stronger water stress, and the content of MDA in roots is lower than that in leaves. The soluble protein in roots and leaves is decreased under water stress. The protective enzyme activities and lipid peroxidation in roots are positively related to that in leaf, showing significant difference for most of correlation coefficients. |
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