不同低磷胁迫时间对巴西橡胶树幼苗生长及形态特征的影响

Study on the Morphological Indexes of Hevea brasiliensis under Different Days of P Deficiency Treatment on H. brasiliensis Seedling

[目的]研究磷素缺乏对橡胶树生长及形态特征的影响。[方法]利用橡胶树RRIM600号实生无性系幼苗为材料,通过水培试验,研究不同低磷胁迫时间对巴西橡胶树幼苗生长及形态特征的影响。[结果]不同低磷胁迫处理时间下,橡胶树株高、整株干重、叶干重均显著低于正常供磷,而根干重、主根长、茎粗均与正常供磷无显著差异。叶干物质分配率随着磷水平下降逐渐降低,茎干物质分配率变化趋势不明显,根干物质分配率则随着磷水平下降呈上升趋势。[结论]橡胶树为适应低磷胁迫,其形态特征会发生明显变化。

[Objective] Study the effects of P deficiency on the morphological indexes of Hevea brasiliensis.[Method] The hydroponic culture experiments were carried out with the clone RRIM600（H.brasiliensis）seedling under different days of P deficiency treatment.[Result]Under different days of P deficiency treatment,comparing with the normal P（CK）,the P deficiency significantly decreased the plant height,total biomass and leaf biomass,but no obvious change occurred in the root biomass,tap root length,stem girth and the biomass.The P deficiency decreased the dry matter partitioning of leaf,but increased the dry matter partitioning of root,meanwhile no obvious changes of dry matter partitioning occurred in the stem.[Conclusion] The morphological indexes of H.brasiliensis have obviously changed under P deficiency treatment.