不同Ca^(2+)浓度对蒲公英和橡胶草种子萌发及根系生长的影响

Effects of Different Ca^(2+) Concentrations on Seed Germination and Root Growth of Taraxacum mongolicum and Taraxacumkok-saghyz

【目的】研究黄蒲蒲公英和科根橡胶草2个品系种子萌发和根系生长对不同Ca^(2+)浓度的响应,分析其种子及根部对Ca^(2+)的响应特征。【方法】以新疆当地黄蒲蒲公英、科根橡胶草为材料,2020年设置室内试验。设0(CK)、0.04、0.08、0.12、0.16 mol/L 5个Ca^(2+)浓度处理。【结果】与CK相比,0.04 mol/L Ca^(2+)处理未显著影响黄蒲蒲公英和科根橡胶草的种子发芽率、发芽势、发芽指数,其余Ca^(2+)处理下的种子萌发参数均随着浓度增加呈降低趋势。根系参数与种子萌发参数表现一致,根系总长度、表面积、体积均随着Ca^(2+)浓度的增加逐渐降低,科根橡胶草的细根长度(直径(d)<0.5 mm)在0.04、0.08 mol/L Ca^(2+)浓度处理下大于黄蒲蒲公英。【结论】黄蒲蒲公英和科根橡胶草在不同的Ca^(2+)浓度处理下的根系生长适应性不同。尤其在0.04、0.08 mol/L Ca^(2+)浓度处理下科根橡胶草细根长度要大于黄蒲蒲公英,发芽率也要大于黄蒲蒲公英。

【Objective】To study the response of seed germination and root growth to different concentrations of Ca^(2+) and elucidate the response characteristics of seed and root to Ca^(2+).【Method】In this study,we used theTaraxacum mongolicum strain Huangpu and Taraxacumkok-saghyz strain Kegen in Xinjiang as materials,In 2020,the laboratory experiment was carried out Institute of Crop Germplasm Resources,Xinjiang Academy of Agricultural Sciences.【Result】Compared with CK,0.04 mol/L Ca^(2+) treatment had no significant effect on the germination rate,germination potential and germination index of Huangpu and Kegen.The germination parameters of other Ca^(2+) treatments decreased with the increase of concentration.The total length,surface area and volume of roots decreased gradually with the increase of Ca^(2+) concentration.The fine root length(diameter(d)<0.5 mm)of Kegen was larger than that of Huangpu under 0.04 and 0.08 mol/L Ca^(2+) concentrations.【Conclusion】The root growth adaptability of Huangpu and Kegen is different under different Ca^(2+) concentrations.Especially at the concentration of 0.04 and 0.08 mol/L Ca^(2+),the fine root length of Kegen is longer than that of Huangpu,and the germination rate of Kegen is higher than that of Huangpu.