为揭示PGPR菌剂(植物根际促生菌)对蜈蚣草修复砷污染土壤的影响机理,为植物-微生物联合修复砷污染土壤提供技术支撑,采用盆栽试验将PGPR菌剂加入受砷胁迫的蜈蚣草中进行培养,利用变性梯度凝胶电泳(denaturing gradient gel electrophore...为揭示PGPR菌剂(植物根际促生菌)对蜈蚣草修复砷污染土壤的影响机理,为植物-微生物联合修复砷污染土壤提供技术支撑,采用盆栽试验将PGPR菌剂加入受砷胁迫的蜈蚣草中进行培养,利用变性梯度凝胶电泳(denaturing gradient gel electrophoresis,简称DGGE)技术对接种PGPR菌剂的盆栽蜈蚣草根际细菌多样性进行研究,并分析根际细菌在重金属与PGPR菌剂胁迫下的群落结构特征。测定根际土壤中的砷含量、pH值、有机质含量、有效磷含量、速效钾含量,根据植株外在发育情况与内在的营养物质及对砷修复量进行比较,得出芽孢杆菌(Bacillus)添加细杆菌属(Microbacterium)细菌对蜈蚣草生长发育起到重要影响。典范对应分析(canonical correspondence analysis,简称CCA)结果显示,pH值、速效氮含量、有效磷含量是影响土壤种群结构、促进蜈蚣草吸附砷的重要因素。展开更多
In this study,the effects of nine different combinations of transplanting and harvest dates on yield and quality of flue-cured tobacco leaves were investigated.The results showed that different combinations of transpl...In this study,the effects of nine different combinations of transplanting and harvest dates on yield and quality of flue-cured tobacco leaves were investigated.The results showed that different combinations of transplanting and harvest dates had few effects on growth period and agronomic characters of tobacco plants but exerted remarkable effects on economic characters and chemical composition of flue-cured tobacco leaves.With the postponing of transplanting stage,output value of flue-cured tobacco leaves increased.Output value of flue-cured tobacco leaves in C1treatment（normal harvest） was higher than that in C2（harvest 7 d later） and C3（harvest 14 d later） treatments.Different combinations of transplanting and harvest dates had significant effects on chemical composition of flue-cured tobacco leaves,which exhibited no obvious law.Overall,flue-cured tobacco leaves in T3C1treatment（transplanting 14 d earlier,normal harvest） displayed excellent performance compared with other treatments.展开更多
文摘In this study,the effects of nine different combinations of transplanting and harvest dates on yield and quality of flue-cured tobacco leaves were investigated.The results showed that different combinations of transplanting and harvest dates had few effects on growth period and agronomic characters of tobacco plants but exerted remarkable effects on economic characters and chemical composition of flue-cured tobacco leaves.With the postponing of transplanting stage,output value of flue-cured tobacco leaves increased.Output value of flue-cured tobacco leaves in C1treatment（normal harvest） was higher than that in C2（harvest 7 d later） and C3（harvest 14 d later） treatments.Different combinations of transplanting and harvest dates had significant effects on chemical composition of flue-cured tobacco leaves,which exhibited no obvious law.Overall,flue-cured tobacco leaves in T3C1treatment（transplanting 14 d earlier,normal harvest） displayed excellent performance compared with other treatments.
