化感物质对玉米种子及苗期生长特性的影响

Allelochemicals: Effects on Growth Characteristics of Maize Seeds and Seedlings

为研究秸秆中化感物质对玉米种子萌芽和苗期生长特性的影响,设置不同浓度对羟基苯甲酸、邻苯二甲酸、苯甲酸、丁香酸和香草酸混酸液为处理,以蒸馏水为对照(CK),培养玉米种子及幼苗并测定其生理指标。结果表明:混酸液处理显著降低玉米种子发芽率和胚根长;100 mg/L、200 mg/L和500 mg/L混酸液处理极显著降低胚轴长和玉米苗期根系活力。混酸处理过氧化氢酶活性均高于CK,无显著差异。随混酸液浓度升高,玉米叶片丙二醛含量逐渐增加。50 mg/L以上浓度混酸液对玉米种子及苗期生长均有抑制作用。

The paper aims to study the effects of allelochemicals in straw on the germination of maize seeds and growth characteristics of seedlings.We set different concentrations of mixed acid solutions of phydroxybenzoic acid,phthalic acid,benzoic acid,syringic acid and vanillic acid as treatments,and cultivated maize seeds and seedlings,determined their physiological indexes by taking distilled water as control(CK).The results showed that:the mixed acid solutions significantly reduced the germination rate and radicle length of maize seeds;the mixed acid solutions of 100 mg/L,200 mg/L and 500 mg/L significantly reduced hypocotyl length and the root activity of maize seedlings;the catalase activity of mixed acid solutions were higher than that of CK,and there was no significant difference;with the increase of mixed acid concentration,MDA content in maize leaves increased gradually.Mixed acid solution of above 50 mg/L concentration could inhibit the growth of maize seeds and seedlings.