四种景天属植物对锌吸收和累积差异的研究(英文)

Differences of Uptake and Accumulation of Zinc in Four Species of Sedum

采用营养液培养试验 ,比较研究了 4种景天属植物对Zn的吸收、积累和运输特性。结果表明 ,东南景天(SedumalfrediiHance)耐Zn毒的能力远强于珠芽景天 (S .sarmentosumBunge)、凹叶景天 (S .bulbiferumMakino)和垂盆草 (S .emarginatumMigo) ,其地上部和根系的干物质产量随着Zn浓度的增加而逐渐减少 ;当浓度≤ 40mg·L-1时 ,东南景天的地上部和根系的干物质产量均随Zn浓度的增加而增加 ,其地上部Zn含量、积累量及其Zn运输速率均显著高于珠芽景天、凹叶景天和垂盆草 ;当Zn浓度低于 80mg·L-1时 ,东南景天地上部Zn含量随着营养液中Zn浓度的增加而增加 ,在 80mg·L-1浓度 ,其地上部Zn含量高达 19.0 9mg·g-1。东南景天的地上部Zn含量 /根系Zn含量的比值大于 1,而株芽景天、凹叶景天和垂盆草的地上部Zn含量 /根系Zn含量比值小于 1。东南景天是在我国首次发现的具有生物量大。

Four species of Sedum L. were grown in nutrient solution for the comparison of their Zn uptake and accumulation. S. alfredii Hance showed much greater tolerance to Zn than the other three species. Shoot and root yields of S. sarmentosum Bunge, S. bulbiferum Makino, and S. emarginatum Migo decreased with increasing Zn concentration in the solution, while shoot and root yields of S. alfredii increased when Zn concentration was ≤80 mg·L -1. At 80 mg·L -1 Zn, Zn concentration in shoots of S. alfredii reached 19.09 mg·g -1. S. alfredii was also more efficient in Zn translocation from roots to shoots, while Zn concentration in shoots was much higher than in roots. However, this was not the case for the other three species. The results showed that S. alfredii is a Zn hyperaccumulator and could be useful for the phytoremediation of Zn-contaminated soils.