| 小麦、苜蓿秸秆浸提液对棉花的化感效应 |
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| 引用本文：孙新展，刘建国，陈华伟，韩 羽，符家伟.小麦、苜蓿秸秆浸提液对棉花的化感效应[J].西北农业学报,2018,27(1):69~75 |
| DOI:10.7606/j.issn.1004-1389.2018.01.010 |
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| 基金项目:国家自然科学基金（31560375）。 |
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| 中文摘要:为缓解新疆棉花长期连作障碍，小麦和苜蓿与棉花合理轮作提供理论依据，研究不同质量浓度的小麦、苜蓿浸提液对棉花种子萌发和幼苗生长的影响。结果表明:小麦、苜蓿秸秆水浸提液对棉花种子的萌发表现出一定的化感效应，低质量浓度(10 g/L)的小麦浸提液可促进棉花幼苗生长，根系活力、超氧化物酶（SOD）活性、过氧化氢酶（CAT）活性的化感指数分别为0.22、0.12、0.22，高质量浓度浸提液均表现为抑制作用；苜蓿秸秆浸提液处理抑制了棉花种子萌发及幼苗生长，且抑制效应随着浸提液质量浓度增加而增加；随小麦、苜蓿秸秆浸提液质量浓度的升高棉花叶片中的丙二醛(MDA)分别由5.4、8.45 μmol/g上升到10.16、13.06 μmol/g，高质量浓度浸提液可破坏幼叶的生物膜系统，导致细胞内含物外泄，破坏抗氧化保护酶系统，过氧化物酶(POD)活性不断升高，加速植物的衰老。综合来看，苜蓿水浸提液对棉花的抑制作用大于小麦浸提液。 |
| 中文关键词:小麦 苜蓿 棉花 水浸提液 化感作用 |
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| Allelopathic Effect of Wheat and Alfalfa Straw Aqueous Extracts on Cotton |
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| Abstract:For alleviating problems of cotton cropping in Xinjiang and providing theoretical basis for wheat and alfalfa crop rotation with cotton,five different mass concentrations of wheat and alfalfa straw aqueous extracts were used to study the allelopathic effects on germination and seedling growth of cotton seeds.The results showed that wheat and alfalfa different extracts had different allelopahic effects on germination of cotton seeds.In lower mass concentrations (below 10 g/L),wheat extracts had positive effects on cotton seedling growth,for example,the value of root vigor,superoxide dismutase (SOD) activity and catalase (CAT) activity were 0.22,0.12,0.22,respectively.On the contrary,the water extracts played an inhibitory role in higher mass concentrations.Different mass concentrations of alfalfa extracts had restraining effect on cotton germination and seedling growth,and the higher the mass concentration,the stronger the inhibition.With increase of the wheat and alfalfa extracts mass concentrations,malondialdehyde (MDA) content increased from 5.4,8.45 μmol to 10.16,13.06 μmol in the fresh leaves of every gram of cotton,respectively.High mass concentration extracts destroyed the biomembrane system of young leaves,induced the leakage of cell inclusion,destroyed the antioxidant enzyme system,increased peroxidase (POD) activity,accelerated the aging of plants.Taken together,the allelopathic effects of alfalfa extract were higher than that of wheat extract. |
| keywords:Wheat Alfalfa Cotton Aqueous extracts Allelopathy |
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