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

摘要

[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 bi-omass 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.