Intra-specific differences in nickel tolerance and accumulation in the Ni-hyperaccumulator Alyssum bertolonii
Intra-specific differences in nickel tolerance and accumulation in the Ni-hyperaccumulator Alyssum bertolonii
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DOI：
10.1016/j.envexpbot.2006.12.011
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发表时间：
2007-07-01
影响因子：
5.7
通讯作者：
Gonnelli, C.
中科院分区：
文献类型：
--
作者：
Galardi, F.;Corrales, I.;Gonnelli, C.
研究了9个露头蛇纹石特有的镍富集植物白茉莉（Alyssum bertolonii）对镍的耐受性、富集水平和茎根浓度比的差异。对不同群体的植株进行水培培养，并对其进行一定浓度的镍处理。结果表明，该专性蛇形植物群体在镍耐受性和镍积累程度上存在显著的种内差异。居群中，茎部形态与根系耐受性无相关性，但根与茎部镍积累有明显的相关性。高富集群体在镍含量上的茎根比也有显著差异，但与茎部镍积累量无显著关系。关于金属耐受性和超积累之间的关系尚不清楚，我们的研究结果表明，这两种现象在镍超积累体白莲花中存在很强的正线性关系。(C) 2007 Elsevier B.V.版权所有
Populations of the serpentine-endemic nickel-hyperaccumulator Alyssum bertolonii from nine different outcrops were investigated for differences in their nickel tolerance and accumulation levels and shoot:root ratio of nickel concentration.Plantlets from the different populations were cultivated in hydroponics culture and subjected to a range of nickel concentrations. For populations of this obligate serpentinophyte, the results showed significant intra-specific differences in the degree of both nickel tolerance and nickel accumulation. Among populations there was no correlation between the patterns of shoot and root tolerance, whereas there was a clearly correlated pattern for root and shoot nickel accumulation. The populations of this hyperaccumulator showed a significant variation also in shoot:root ratio in nickel concentration, but there was no relationship between this trait and shoot nickel accumulation levels.Regarding the still obscure relationship between metal tolerance and hyperaccumulation, our results demonstrated a strong positive linear relationship between these two phenomena in the nickel hyperaccumulator Alyssum bertolonii. (C) 2007 Elsevier B.V. All rights reserved.