镉在小白菜体内的累积规律及其生物效应的研究

A study on the physiological effects of cadmium on bok choy and its accumulation therein

通过液体营养液培养的方法，以小白菜不同部位对镉的吸收累积量以及小白菜不同生长时期的平均单株叶长、平均单株鲜重、平均单株叶片数等作为研究指标，研究了0～10mg／L外源镉对小白菜生长的影响及镉在小白菜体内累积的规律。结果表明，重金属镉在小白菜体内的累积状态为，根部累积量（0．014～376．224mg／kg）显著高于地上部累积量（0．016—10．278mg／kg）。低浓度镉（〈7．5mg／L）对于研究的3个生理指标基本表现促进作用；中浓度镉（7．5mg／L）处理时3个生理指标相对于空白则无明显差异；高浓度镉（7．5—10．0mg／L）则对3个生理指标表现为抑制作用，当外源镉浓度达到10．0mg／L表现为显著抑制。

Cadmium was a harmful element for the healthy of plants. Through the liquid nutrient solution training methods, this study take the amount of uptake and accumulation of cadmium by bok ehoy and the average blade length, average individual fresh weight, average number of plant leaves of bok choy＇s different growth period as research indicators of the effect of cadmium. Studied the effect of the growth of bok choy and the accumulation in the Chinese by different Cd concentrations ranging from 0 to 10. 0 mg/L. In the present study, accumulation amount of Cd by root （0. 014 -376. 224 mg/kg） was notable higher than stems and leaves （0. 016 - 10. 278 mg/kg） . Cd concentrations lower than 7. 5 mg/L had a trend to promote the increase of the average blade length, average individual fresh weight, average number of plant leaves. Middle concentrations （7. 5 mg/ L） had no significant difference effect comparing with the blank, however, higher Cd loading （7. 5 - 10. 0 mg/L） significantly reduced the average blade length, average individual fresh weight, average number of plant leaves.