Wang Hong-Qi, Wang Shuai, Ning Shao-Wei, Sun Yan-Ling, Hou Ze-Qing
Key Laboratory for Water and Sediment Sciences of Ministry of Education, College of Water Sciences, Beijing Normal University, Beijing 100875, China.
Huan Jing Ke Xue. 2011 Mar;32(3):886-95.
Seed germination, root elongation, shoot elongation and ratio of shoot to root of wheat in soils polluted by lead (Pb) and benzo (a)pyrene (B[a] P) with medium-low concentrations were studied to reveal the ecological effects of combined pollution and screen the indicative markers. Results indicated that seed germination was not sensitive to single or combined pollution of Pb or B[a] P. Root elongation was inhibited by single pollution of Pb or B[a]P to different extents. Extensive interactions between Pb and B[a]P occurred to root elongation of wheat, including synergistic-stimulatory effect and antagonistic-inhibitory effect. The joint action was mainly antagonistic. Single pollution of B [a] P had an inhibitory effect on shoot elongation. Under combined pollution conditions, the shoot elongation of wheat correlated well with Pb contents (p < 0.01). B[a] P or the interactions between pollutants had little effect on shoot elongation of wheat. The joint action on shoot elongation was consistently antagonistic. The response pattern of the ratio of shoot to root was similar to the response pattern of shoot elongation. However, the former had better correlation than the latter, indicating it as a more suitable indicative marker for Pb pollution. If lead acetate was employed instead of lead nitrate, longer root elongation, shorter shoot elongation and no effect on ratio of shoot to root were found. Therefore, the forms of Pb salt had significant influence on seed growth of wheat in soils.
研究了中低浓度铅（Pb）和苯并（a）芘（B[a]P）污染土壤中小麦的种子萌发、根伸长、苗伸长及根冠比，以揭示复合污染的生态效应并筛选指示标志物。结果表明，种子萌发对Pb或B[a]P的单一或复合污染不敏感。Pb或B[a]P单一污染对根伸长有不同程度的抑制作用。Pb与B[a]P对小麦根伸长存在广泛的相互作用，包括协同促进效应和拮抗抑制效应，联合作用主要为拮抗作用。B[a]P单一污染对苗伸长有抑制作用。在复合污染条件下，小麦苗伸长与Pb含量显著相关（p<0.01）。B[a]P或污染物间相互作用对小麦苗伸长影响较小。对苗伸长的联合作用始终为拮抗作用。根冠比的响应模式与苗伸长的响应模式相似，但前者相关性更好，表明其作为Pb污染指示标志物更合适。若用醋酸铅代替硝酸铅，则根伸长更长，苗伸长更短，对根冠比无影响。因此，铅盐形态对土壤中小麦种子生长有显著影响。
