Cadmium accumulation in different eggplant cultivars and the effects of grafting on the cadmium accumulation characteristics
Cadmium accumulation in different eggplant cultivars and the effects of grafting on the cadmium accumulation characteristics
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作者：
Q. Qin
采用水培试验研究了不同茄子品种（普通茄和野生茄）对镉的积累规律。torvum），以及嫁接对Cd积累和转运的影响。0.茄子生长44 d后，在营养液中加入1 mg·L-1镉，连续处理7 d。S. melongena比S. torvum。茄子不同部位Cd含量的高低顺序为根、叶、茎，根中积累的Cd约占80。总数的0%。同一茎上生长的嫩叶中积累的镉浓度高于老叶。嫁接显著降低了黄瓜地上部Cd的积累量，且接穗Cd含量显著低于砧木。与S.甜瓜嫁接S. torvum使地上部Cd浓度降低48. 4%，S.甜瓜降低了地上部镉浓度的34。2%，而S. torvum降低地上部Cd浓度88.百分之五与S. torvum上嫁接茄子地上部Cd浓度的变化。Torvum减少了58。0%。嫁接降低茄子地上部Cd积累量的原因可能是嫁接后砧木和接穗韧皮部结构的差异。推测韧皮部在Cd从根向地上部的运输中起重要作用。
A hydroponic experiment was conducted to study the cadmium ( Cd) accumulation in different eggplant cultivars ( common Solanum melongena and wild S. torvum) and the effects of grafting on the Cd accumulation and transportation. 0. 1 mg Cd·L -1 was added to the nutrient solution for 7 days after 44 days of eggplant growth. The Cd accumulation in S. melongena was higher than that in S. torvum. The Cd concentrations in different parts of the eggplants ranked as root leaf stem,and the accumulated Cd in roots accounted for approximately 80. 0% of the total. The Cd concentration accumulated in young leaves was higher than that in old leaves growing on the same stems. Grafting decreased the Cd accumulation in shoots significantly,and the Cd concentration in scions was significantly lower than that in rootstocks. As compared with S. melongena,grafting on S. torvum reduced the shoot Cd concentration by 48. 4% ,grafting on S. melongena reduced the shoot Cd concentration by 34. 2% ,while self-grafting on S. torvum reduced the shoot Cd concentration by 88. 5% . As compared with S. torvum,the shoot Cd concentration of the eggplants self-grafted on S. torvum reduced by 58. 0% . The decrease of the Cd accumulation in eggplant shoots due to grafting could be induced by the discrepancies betweenthe phloem structure of rootstock and scion plants after grafting. It was speculated that phloem played an important role in the Cd transportation from root to shoot.