DIFFERENTIATION OF QUANTITATIVE CHARACTERS OF VICIAFABA CONTAMINATED WITH HEAVY METALS
蚕豆在重金属污染条件下数量性状的分化研究

With the orthogonal designing method, the plants of the same variety of Broadbean (Vicia faba L.)were treated with heavy metal ions Pb 2 , Cd 2 , Hg 2 , Zn 2 in successive four generations. Parameters of quantitative characters(PQCs) such as the percentage of survival seedling(PSS), height of plants (HP), the relative time of first blooming(TFB), pods per seeding(PPS), amounts of bean every 20 pods (BEP) and weigth of 50 bean (WB) were investigated. The results showed that all PQCs except TBF went up as affected with low dose of metal ions at the initial generation, and decreased as affected by high dose of metal ions. The plants responded to low dose of metal ions with a small decrease in PQCs or did not come out at the first generation, and then with a significant decrease in PQCs in the second generation. In the proceeding of generations, however, the PQCs recovered to the inital. The toxical response of the plants to high dose metal treatment, in terms of PQCs, appeared in the first generation and then got enhanced in the following one or two generations. Then, similarly, the PQCs recovered to the inital. It might be considered that plants have potential abilities to adapt to environmental pollution, originating from the gene frequency change induced by pollution. Such a gene frequency change reflected the role of pollution in the process of ecological differentiation of the plants.