In the present study, different concentrations of lead (factor A; 0, 15, and 30 mg L −1) and cadmium (factor B; 0 and 5 mg L −1) were applied via irrigation water during 6 months to evaluate their effects on growth of European hackberry (Celtis australis L.) plants. The experiment was arranged in factorial with completely randomized design and four replications under greenhouse conditions. Application of 5 mg L −1 Cd or the lead levels (15 and 30 mg L −1) significantly reduced new shoot growth, plant leaf area, SPAD value, leaf water conductance and leaf photosynthesis, whereas significant increase in number of chlorotic and necrotic leaves, leaf transpiration rate, leaf proline and soluble sugars was observed. Higher reduction in new shoot growth and leaf water conductance and higher increase in leaf soluble sugars and proline was observed over the interaction of 5 mg L −1 Cd and 30 mg L −1 Pb. The highest soluble sugars and proline were in Pb30Cd5 (a3b2) treatment. Leaf Pb or Cd concentration was increased following their treatment. Application of cadmium significantly reduced leaf Pb, and similarly leaf Cd was significantly reduced by application of lead at both levels compared to untreated plants. The results showed that the hackberry growth was influenced by positive and negative interactions of Pb and Cd applied in irrigation water. The extent of growth reduction indicates that hackberry represents a relatively tolerant ornamental tree to high Pb and Cd levels.

中文翻译：

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铅和镉对欧洲朴树的生长和叶片morphophysiological特性（互动朴树芦苇）苗

在本研究中，在六个月内通过灌溉用水施用了不同浓度的铅（A因子； 0、15和30 mg L -1）和镉（B因子：0和5 mg L -1）以评估其效果。对欧洲朴树（Celtis australis L.）植物生长的影响。以完全随机设计的阶乘安排实验，并在温室条件下重复四次。施用5 mg L -1 Cd或铅水平（15和30 mg L -1）显着降低了新梢生长，植物叶片面积，SPAD值，叶片水导度和叶片光合作用，而褪绿和坏死的数量显着增加观察叶片的叶片蒸腾速率，脯氨酸和可溶性糖含量。与5 mg L -1 Cd和30 mg L -1 Pb的相互作用相比，观察到新梢生长和叶片水导率的降低程度更高，叶片可溶性糖和脯氨酸的含量升高程度更高。可溶性糖和脯氨酸含量最高的是Pb30Cd5（a3b2）处理。处理后叶片中铅或镉的浓度增加。与未处理的植物相比，镉的施用显着降低了叶片的Pb含量，相似地，铅在两种水平下的施用均显着降低了叶片Cd含量。结果表明，朴树生长受到灌溉水中铅和镉的正负相互作用的影响。生长减少的程度表明朴树代表了对高Pb和Cd水平的相对耐受的观赏树。可溶性糖和脯氨酸含量最高的是Pb30Cd5（a3b2）处理。处理后叶片中铅或镉的浓度增加。与未处理的植物相比，镉的施用显着降低了叶片的Pb含量，相似地，铅在两种水平下的施用均显着降低了叶片Cd含量。结果表明，朴树生长受到灌溉水中铅和镉的正负相互作用的影响。生长减少的程度表明朴树代表了对高Pb和Cd水平的相对耐受的观赏树。可溶性糖和脯氨酸含量最高的是Pb30Cd5（a3b2）处理。处理后叶片中铅或镉的浓度增加。与未处理的植物相比，镉的施用显着降低了叶片的Pb含量，相似地，铅在两种水平下的施用均显着降低了叶片Cd含量。结果表明，朴树生长受到灌溉水中铅和镉的正负相互作用的影响。生长减少的程度表明朴树代表了对高Pb和Cd水平的相对耐受的观赏树。结果表明，朴树生长受到灌溉水中铅和镉的正负相互作用的影响。生长减少的程度表明朴树代表了对高Pb和Cd水平的相对耐受的观赏树。结果表明，朴树生长受到灌溉水中铅和镉的正负相互作用的影响。生长减少的程度表明朴树代表了对高Pb和Cd水平的相对耐受的观赏树。