连作烤烟根际土壤自毒物质成分分析

本研究以连作烤烟12年的土壤为材料，分析烤烟连作条件下烤烟根际土壤自毒潜力及土壤物质成分差异，为深入揭示烟草连作障碍提供依据。结果表明，连作条件下，烤烟根际土壤对受体植物莴苣（Lactuca sativa）、烟草（Nicotiana tabacum）具有较强的化感自毒潜力。物质成分分析结果显示，未种植烤烟的对照土壤中存在7种糖类物质、14种酸类物质、16种酯类物质、1种其他类物质；而连作烤烟根际土壤中存在2种糖类物质、3种酸类物质、8种酯类物质、12种其他类物质。与对照相比，连作烤烟根际土壤中存在特有的8种与自毒作用相关的物质，如香草醛、洋地黄毒素、雪松醇、植酮、诱虫烯、β 谷甾醇、胆甾烷醇、胆甾烷 3 酮。

Constituents of autotoxic chemical from rhizosphere soil under flue-cured tobacco continuous cropping

The rhizosphere soil under flue-cured tobacco continuous cropping for 12 years was used to estimate the autotoxic potential and constituents of autotoxic chemicals for disclosing the development mechanism of successive cropping obstacle of tobacco.The results of this study showed that the continuous cropping encouraged the tobacco rhizosphere soil to produce greatly autotoxic potential to lettuce and tobacco seedlings when compared to control.7 carbohydrate compounds,14 acid compounds,16 ester compounds,and...