截短侧耳素对马铃薯幼苗生长的影响

为了解截短侧耳素对高等植物的毒害作用情况，研究了马铃薯‘克新1号’幼苗在含有不同浓度截短侧耳素(0、0.00128、0.0032、0.0064、0.016、0.032、0.08、0.16 mg/mL)的培养基上生长情况。结果表明，培养基中侧耳素浓度大于0.016 mg/mL的条件下，马铃薯生长都受到显著抑制，随着浓度的增加，叶片数、株高、茎粗、根长、及根、茎、叶干重均显著降低；在0.08~0.16 mg/mL条件下，马铃薯幼苗植株矮小，死亡率高，根系极少，甚至不生根。回归分析发现，测定的各项指标随侧耳素浓度的增加呈负幂函数的形式下降，其中指数的绝对值由高到低依次为根重>根长>茎重>株高>叶重>叶数>茎粗。这些结果表明，截短侧耳素对马铃薯幼苗的生长具有毒害作用，抑制作用对根最严重，叶最轻，这可能是根直接接触药物造成的。

Effect of Pleuromutilin on the Growth of Potato Seedling

For understanding whether pleuromutilin have toxic effects on the plants, the effect of pleuromutilin with different concentration (0, 0.00128, 0.0032, 0.0064, 0.016, 0.032, 0.08, 0.16 mg/mL) in media on potato seedlings’ of ‘Kexin 1’ cultivar were studied. The results show that when the concentration is greater than 0.016 mg/mL, the pleuromutilin have significant inhibition effect on the growth of potato seedling. With the increase of pleuromutilin concentration, the number of leaves, plant height, stem diameter, root length, and the dry weight of leaves, roots, and stem significantly decrease. Under the concentration of 0.08-0.16 mg/mL, potato plant become dwarf, mortality increases and has little or even no roots. The regression analysis shows that all the determined indexes decline with the concentration of pleuromutilin increase by a form of negative power function and the absolute value of power index are in the following order: dry weight of root> root length> dry weight of leaf> plant height> dry weight of leaf> number of leaf> stem diameter. Those suggest that pleuromutilin could have inhibition (toxic) effect on the growth of potato, and have the most suppression effect on root and the lowest suppression effect on leaf which could be resulted of direct contact of the root to pleuromutilin.