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中文摘要：
采用15％PEG6000模拟干旱胁迫，研究了不同物质的量浓度的氯化镧对干旱胁迫下矮抗58幼苗叶片抗氧化酶活性、渗透调节物质和抗氧化物质等的影响。结果表明，在一定物质的量浓度范围内，外源施加氯化镧均能显著改善干旱胁迫条件下矮抗58幼苗叶片的抗氧化系统和渗透调节物质而增强其抗旱性，尤以10μmol／L和30μmol／L氯化镧更为明显。与单独干旱胁迫相比，10μmol／L LaCl3使干旱下叶片SOD、GR和DHAR活性、GSH及可溶性蛋白分别增加13．2％、212．5％、50％、23．1％和10．6％，使其膜透性和MDA分别降低53．2％和59．4％；30μmol／L LaCl3使SOD、APX和GR活性、GSH、可溶性糖和可溶性蛋白分别增加10％、20％、43．7％、46．2％、18．6％和14．2％，使膜透性和MDA分别降低47．8％和53．6％。
英文摘要：
The effects of lanthanum chloride on physiological properties of Aikang58 seedling leaves were studied under drought stress induced by 15%PEG6000. The results showed that lanthanum chloride could improve the drought tolerance of Aikang58 seedling leaves through increasing the activities of antioxidant enzymes and the contents of osmotic adjustment substances in a certain concentration range, especially for 10 μmol/L and 30 μmol/L LaCI3. Compared with drought stress alone, 10 μmol/L LaCI3 could increase the activities of SOD, GR and DHAR, and the contents of GSH, soluble sugar and soluble protein in leaves of Aikang58 by 13.2%, 212.5%, 50%, 23.1% and 10.6%, respectively. 10 μmol/L LaCl3 could reduce the membrane permeability and MDA content in leaves by 53.2%and 59.4%, respectively. 30 μmol/L LaCl3 could increase the activities of SOD, APX and GR, and the contents of GSH, soluble sugar and soluble protein by 10%, 20%, 43.70%, 46.2%, 18.6% and 14.2%, respectively. 30 μmol/L LaCl3 could reduce the membrane permeability and MDA content in leaves by 47.8% and 53.6%, respectively.
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