烟草残体腐解物的化感潜力

Allelopathic potentional of decomposing material of tobacco residues

以对化感物质具有高敏感性的莴苣(Lactuca sativa L.)种子作为指示材料,测试了烤烟品种K326的顶芽、腋芽等残体腐解液的化感潜力.结果表明:烟草残体腐解后对莴苣种子萌发具有显著的抑制作用,以质量浓度0.10g/mL处理抑制作用最显著;残体腐解液对莴苣幼苗生长存在低促高抑的双重浓度效应,其中低质量浓度0.05g/mL处理有一定促进作用,高质量浓度0.10g/mL处理抑制作用最显著.

Lettuce seeds （Lactuca sativa L.）,the common allelopathy bioassay system,were germinated in the presence of decomposition of terminal bud and axillary bud of flue-cured tobacco K326 for evaluating its allelopathic potential. Results showed that seed germination of lettuce could be promoted by low concentrations,however, inhibited by high concentrations of decomposing tobacco, and the concentration by 0.10 g/mL has the most significant inhibition. Decomposing tobacco residues also had a similar effect on seedling growth of lettuce that was performed on seed germination. Low concentration by 0.05 g/mL has some inhibitive effect and high concentrative by 0.10 g/mL has the most significant inhibitive effect on seedling growth. In conclusion, significant inhibitory effect on seed germination and seedling growth could be formed in process of tobacco residues＇ decomposing.