烯效唑对淹水胁迫下大豆农艺性状及生理生化指标的影响

摘要

为研究烯效唑对大豆淹水胁迫的缓解作用,以亚有限结荚习性大豆品种垦丰14(耐涝品种)和垦丰16(涝渍敏感品种)为试验材料,在大豆始花期叶面喷施烯效唑,喷药5d后进行淹水胁迫,5d后恢复正常水分管理,调查各处理大豆农艺性状和生理生化指标.结果表明:淹水胁迫抑制大豆生长,降低大豆株高,增加茎基部茎粗,减少植株叶片、叶柄、茎、根等各部位干物质重的积累;涝渍导致大豆体内抗氧化酶活性降低.喷施烯效唑处理能有效缓解淹水胁迫下植物干物质的降低;显著提高大豆体内抗氧化系统酶活性,降低MDA含量,诱导叶片中脯氨酸增加,提高根系中脯氨酸含量,增加根系中可溶性糖与淀粉的积累,为提高大豆耐涝性和恢复正常水分后产量积累提供保障.%With sub - indeterminate soybean varieties Kenfeng 14 and Kenfeng 16 as materials,a pot experi-ment was conducted to analyze the effect of uniconazole on agronomic traits and physiological and biochemical char-acteristics of soybean under waterlogging stress. Five days after spraying uniconazole at early flowering period,wa-terlogging stress was performed for five days,and then returned to normal water. The results showed that the growth of soybean was inhibited by flooding stress,the plant height,the accumulation of dry matter in plant leaves,peti-oles,stems and roots and antioxidant enzyme activities were decreased,but the stem diameter was increased. Spra-ying uniconazole could effectively alleviate plant dry matter weight reduced under waterlogging stress,and signifi-cantly improve the activity of soybean antioxidant enzyme system,reduce MDA content,increase proline content in leaf and root,and soluble sugar and starch accumulation in root. All these could improve soybean production by in-crease their waterlogging resistance and returned to normal after moisture accumulation.