不同Ca2+浓度对蒲公英和橡胶草种子萌发及根系生长的影响

【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Ca²⁺浓度的响应,分析其种子及根部对Ca²⁺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Ca²⁺浓度处理。【结果】与CK相比,0.04 mol/L Ca²⁺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Ca²⁺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Ca²⁺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 Ca²⁺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Ca²⁺浓度处理下的根系生长适应性不同。尤其在0.04、0.08 mol/L Ca²⁺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。

Effects of Different Ca2+ Concentrations on Seed Germination and Root Growth of Taraxacum mongolicum and Taraxacumkok-saghyz

【Objective】 To study the response of seed germination and root growth to different concentrations of Ca²⁺ and elucidate the response characteristics of seed and root to Ca²⁺.【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 Ca²⁺ treatment had no significant effect on the germination rate, germination potential and germination index of Huangpu and Kegen. The germination parameters of other Ca²⁺ treatments decreased with the increase of concentration. The total length, surface area and volume of roots decreased gradually with the increase of Ca²⁺ 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 Ca²⁺ concentrations. 【Conclusion】 The root growth adaptability of Huangpu and Kegen is different under different Ca²⁺ concentrations. Especially at the concentration of 0.04 and 0.08 mol/L Ca²⁺, the fine root length of Kegen is longer than that of Huangpu, and the germination rate of Kegen is higher than that of Huangpu.