Institute of Plant Protection, College of Plant Protection, Northwest Agriculture and Forest University, State Key Laboratory of Crop Stress Biology in Arid Areas, Yangling, Shaanxi 712100, China.
J Insect Sci. 2012;12:44. doi: 10.1673/031.012.4401.
The effects of cadmium (Cd) on the development, fecundity, and reproduction of the grain aphid, Sitobion avenae Fabricius (Hemiptera: Aphididae) were estimated by constructing a life table of S. avenae exposed to Cd. The concentrations of Cd in the soil were as follows: 0, 10, 20, 40, 80, and 160 mg/kg. The correlation analysis of the Cd concentration in soil and wheat revealed that the amount in the wheat increased with the increase of Cd concentrations in soil. The results indicated that, the latter part of the reproduction period was significantly affected by Cd, according to the curve of the total survival rate (l(x)). The net reproductive rate (R(0)), innate capacity of increase (r), and finite rate of increase (λ) of S. avenae all decreased under the stress of Cd, and were lowest at a Cd concentration of 20 mg/kg. Cd also negatively affected fecundity and m(x) (the number of offspring produced by an individual female). At 20 mg/kg, the decline of them was most obvious. In conclusion, survival and reproduction of S. avenae were inhibited under the treatment of the heavy metal Cd. Sitobion avenae was more sensitive to Cd at concentration of 20 mg/kg compared to the other concentrations. This concentration can be used to examine the mechanisms behind population genetics and biological mutation of S. avenae when exposed to heavy metal.
采用生命表的方法研究了镉（Cd）对麦长管蚜（Sitobion avenae Fabricius）（半翅目：蚜科）发育、繁殖和生殖的影响。土壤中 Cd 的浓度设置为 0、10、20、40、80 和 160mg/kg。土壤和小麦中 Cd 浓度的相关分析表明，小麦中的含量随土壤中 Cd 浓度的增加而增加。结果表明，根据总存活率（l（x））曲线，繁殖后期受到 Cd 的显著影响。麦长管蚜的净生殖率（R（0））、内禀增长率（r）和周限增长率（λ）在 Cd 胁迫下均降低，在 20mg/kg 的 Cd 浓度下最低。Cd 还对繁殖力和 m（x）（一个雌性个体所产的后代数量）产生负面影响。在 20mg/kg 时，下降最为明显。综上所述，重金属 Cd 处理抑制了麦长管蚜的生存和繁殖。与其他浓度相比，20mg/kg 的 Cd 对麦长管蚜更为敏感。该浓度可用于研究重金属胁迫下麦长管蚜种群遗传学和生物突变的机制。
