摘要： 为研究嫁接对富集植物后代镉积累的影响,通过盆栽试验和小区试验,研究了油菜作为砧木对荠菜嫁接后代镉积累的影响。结果表明:在土壤高浓度镉处理、低浓度镉处理及小区试验条件下,荠菜根系镉含量及根系富集系数大小顺序均为:未嫁接 > 自苗嫁接后代 > 油菜砧木嫁接后代,而荠菜地上部分镉含量、地上部分富集系数、转运系数、根系生物量、地上部分生物量、总生物量、根系镉积累量、地上部分镉积累量和镉积累总量的大小顺序为:油菜砧木嫁接后代 > 自苗嫁接后代 > 未嫁接。在高浓度镉处理、低浓度镉处理和小区试验条件下,油菜砧木嫁接后代的荠菜地上部分镉积累量较未嫁接分别提高了145.41%,98.27%,99.51%,镉积累总量较未嫁接分别提高了110.93%,82.90%,93.89%。在小区试验条件下,油菜砧木嫁接后代的荠菜地上部分镉积累量和镉积累总量分别为1 103.87,1 210.54 μg/m²。因此,以油菜作为砧木嫁接荠菜能明显提高其后代对镉的积累,可在植物修复中推广应用。

关键词: 荠菜, 油菜, 砧木, 嫁接后代, 镉, 积累

Abstract: To study the cadmium accumulation characteristics of post-grafting accumulator generation, the pot and field experiments were conducted to study the effects of rape rootstock on cadmium accumulation characteristics of Capsella bursa-pastoris post-grafting generation.The results showed that under high concentration of cadmium treatment, low concentration of cadmium treatment and field experiment, the cadmium content in root and the root bioconcentration factor of C.bursa-pastoris were ungrafted>self grafted generation>rape rootstock grafted generation.However, the cadmium content in shoot, root bioconcentration factor, transfer factor, root biomass, shoot biomass, total biomass, cadmium accumulation in root, cadmium accumulation in shoot and total cadmium accumulation of C.bursa-pastoris were rape rootstock grafted generation>self grafted generation>ungrafted.At high concentration of cadmium treatment, low concentration of cadmium treatment and field experiment, the rape rootstock grafted generation of C.bursa-pastoris accumulated cadmium in shoot by 145.41%, 98.27% and 99.51% higher than ungrafted, and the total amount of cadmium improved by 110.93%, 82.90%, 93.89% compared with ungrafted.In the field experiment, the cadmium accumulations in shoot and whole plant of the rape rootstock grafted generation of C.bursa-pastoris were 1 103.87, 1 210.54 μg/m², respectively.Therefore, the rape as rootstocks grafting C.bursa-pastoris can significantly improve the cadmium accumulation in generation of C.bursa-pastoris, and can apply in the phytoremediation.

Key words: Capsella bursa-pastoris, Rape seed, Rootstock, Grafted generation, Cadmium, Accumulation

中图分类号: 

• X503

• S616