【摘要】 以野生茄(Solanum torvum,托鲁巴姆)为砧木,茄(Solanum melongena)和番茄(Solanum lycopersicum)为接穗植物,通过田间小区实验,研究了嫁接对重金属Cd在接穗植物地上部分积累的影响,同时探究了元素S对植物Cd积累过程的影响。结果表明:与自根植株相比,对照小区与2 mg·kg-1Cd处理小区内,嫁接茄植株的茎、叶及果实Cd含量分别减少78.0%、86.3%、93.2%和89.1%、89.5%、92.3%;嫁接番茄植株的茎、叶及果实Cd含量分别减少20.6%、15.5%、10%和79.3%、48.3%、4.2%;同时,嫁接植株(茄、番茄)叶片中的总硫(TS)含量显著减少,其变化趋势与Cd积累变化趋势呈正相关关系。研究证明,特异性砧木可以改变嫁接植株重金属Cd富集性状,不同作物对同一砧木的响应存在种间差异,这种改变与嫁接植株S含量变化密切相关。更多还原

【Abstract】 Using wild-type eggplant( Solanum torvum) as rootstock,a field plot experiment was conducted to examine the effects of grafting on Cd accumulation in the shoots of scion plants eggplant( Solanum melongena) and tomato( Solanum lycopersicum). We also explored the role of sulfur in driving plant Cd accumulation. Compared to self-rooted plants,Cd contents in stems,leaves,and fruits of grafted eggplants were reduced by 78. 0%,86. 3%,93. 2% in CK,and89.1%,89.5%,92. 3% in 2 mg ·kg-1Cd-polluted field plots,respectively. The decreases in grafted tomato plants were 20.6%,15.5%,10% in CK,and 79.3%,48.3%,4.2% in 2 mg·kg-1Cd-polluted field plots,respectively. Moreover,total sulfur contents in leaves of grafted plants( eggplant and tomato) were significantly reduced,and the trends of which were consistent with Cd accumulation. Our results indicated that specific rootstock induced the changes of Cd accumulation in grafted plants. There was interspecific difference in the responses of plants to the same rootstock. In addition,such changes of Cd accumulation in plants were closely related with the changes of total sulfur content.更多还原