硝基芳香化合物罗硝唑对冬珊瑚幼苗根系发育的影响

摘要：本研究以冬珊瑚幼苗为实验材料，在MS培养基中加入不同浓度的罗硝唑，探究其对植物根系发育的影响。结果表明：不同浓度罗硝唑的处理导致根系总长度、下胚轴长、根体积、根尖数、根系分叉数、根系表面积和投影面积、生物量及根茎比等表现出显著（P〈0．05）或极显著（P〈0．01）差异。根系总长度随着浓度的增加而减小，根系下胚轴长度随着浓度的增加而增加，根段平均直径随着罗硝唑浓度增加同时增加，坦没有显著性差异（P〉0．05）；外源罗硝唑的使用降低了冬珊瑚幼苗根系的侧根的形成，而且也会导致根系分叉数、根系表面积及投影面积下降；根系高度在各处理之间均没有显著性差异（P〉0．05），幼苗根系外部途径长度在各处理之间差异也都不显著（P〉O．05）；随着外源罗硝唑浓度的增加，冬珊瑚幼苗生物量逐渐下降，低浓度的罗硝唑可增加根茎比，而高浓度则降低根茎比。

The Effect of Aromatic Compound Ronidazole on Root development of Solanum pseudocapsicum seedlings

The seedlings of Solarium pseudocapsicum were used as the experimental materials. It was supplemented with different concentrations of ronidazole in MS medium, in order to explore its impact on plant root development. The result showed that there were significant（P〈0.05）or very significant（P〈 0.01 ）differences in total root length, hypocotyl length, root volume, root number, root branching num- ber, root surface area and projected area, biomass, ratio of root and stem when the seedlings were sup- plemented with different concentrations of ronidazole. With increasing concentration, total root length would decrease, hypocotyl length would increase, the average diameter of the root segment would in- crease too, but no significant differences（P〈0.05） The using of ronidazole could reduce the number of lateral roots, also lead to decline of the number of root branching, root surface area and the projected ar- ea. There were no significant differences（P〈0.05）in root altitude and external pathway length between different treatment. With increasing concentration of ronidazole, the biomass of Solanum pseudocapsi- cum and ratio of root and stem would both decrease.