| 张妮娜,曾明.干旱胁迫下AMF对柑橘幼苗渗透调节及抗氧化能力研究[J].中国南方果树,2018,47(2): |
| 干旱胁迫下AMF对柑橘幼苗渗透调节及抗氧化能力研究 |
| Effects of Arbuscular Mycorrhizal Fungi on Osmoregulation Substances and Antioxidant Enzyme Activities of Citrus Seedlings under Drought Stress |
| 投稿时间：2017-09-02 修订日期：2017-10-24 |
| DOI： |
| 中文关键词: 柑橘 干旱胁迫 丛枝菌根 渗透调节 抗氧化酶 |
| 英文关键词:citrus drought stress arbuscular mycorrhizal fungi osmoregulation antioxidant enzyme |
| 基金项目: |
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| 摘要点击次数: 1919 |
| 全文下载次数: 2308 |
| 中文摘要: |
| 试验以1年生椪柑/枳橙为材料，研究长期水分胁迫下丛枝菌根真菌（AMF）对柑橘根叶生长、渗透调节物质及抗氧化酶活性等生理变化的影响。结果表明：干旱胁迫显著降低菌根侵染率，抑制幼苗生长。与未接种对照相比，接种AMF可以有效缓解干旱胁迫对柑橘幼苗生长的抑制，显著提高根冠比及根系活力。同时，接种AMF进一步促进干旱胁迫下植株根叶可溶性糖及蛋白积累，但在胁迫后期菌根效益削弱。接种AMF可提高干旱胁迫下植株体内SOD、CAT、POD活性，而显著降低幼苗根叶Pro和MDA含量，并随时间的延长MDA降低率越高。由此可见，干旱胁迫下接种AMF可通过促进植株生长，改善渗透调节，提高抗氧化酶活性，增强柑橘耐旱性，从而使柑橘在干旱环境下更宜存活。 |
| 英文摘要: |
| In the research, 1-year-old citrus ( Citrus reticulata Blanco cv. Ponkan/ Citrus sinensis (L.) Osbeck譖oncirus trifoliate (L.) Raf) seedlings were used as materials to study the effects of arbuscular mycorrhizal fungi (AMF) on plant growth, osmoregulation substance contents and antioxidant enzyme activities under long-term drought stress conditions. The result showed that drought stress significantly reduced mycorrhizal colonization compared with the well-watered treatments, while the mycorrhizal dependence was significantly higher. Under soil drought condition, the growth of seedlings was inhibited too. AMF was beneficial to improve citrus drought tolerance, compared with the non-mycorrhizal treatment, the root-shoot ratio and root activity were improved significantly. After AMF-inoculation, the citrus leaves and roots content of soluble sugar and soluble protein were further higher than non-mycorrhizal treatment when the soil moisture content reduces, but the mycorrhizal benefit was better in the early stage. Under drought stress, compared with the non-mycorrhizal treatment, AMF-inoculation increased the activities of SOD, POD and CAT, while significantly decreased the contents of Pro and MDA in citrus leaves and roots. Not only that, during experiment, the rate of decrease in MDA went steadily up. The results indicated that AMF-inoculation could promote plant growth, improve osmotic regulation, raise the activities of antioxidant enzymes, improve the adaptability of citrus seedlings under drought stress. Therefore, mycorrhizal citrus seedlings survived well under the drought environment. |
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