重金属Pb2+和Cd2+对毛竹种子萌发及幼苗早期生长的影响
Effects of Pb2+, Cd2+ on Germination and Seedling Early Growth of Moso Bamboo (Phyllostachys edulis)Seed
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摘要: 以毛竹种子为试材,研究不同浓度铅离子(Pb2+)、镉离子(Cd2+)对毛竹种子萌发和幼苗早期生长的影响。结果表明:随着Pb2+和Cd2+浓度的增加,毛竹种子的发芽率呈现出先升高后降低的趋势,发芽指数、活力指数均与浓度呈负相关关系;同时,Pb2+和Cd2+对幼苗根伸长、芽伸长及生物量积累等指标具有显著的抑制作用,并且这种抑制作用随着浓度的升高而增强,尤其是根部,根伸长抑制率最高分别达到96.20%和94.00%;幼苗地上部分与地下部分对Pb2+、Cd2+的积累随着胁迫强度的增加而升高,但地下部分的积累量要显著高于前者,相同浓度下最高差距分别达到地上部分的27.21、6.25倍。Abstract: Taking Phyllostachys edulis seeds as test material, the effects of Pb2+ and Cd2+ on seed germination and seedling early growth were studied. The results indicated that the germination rate increased at first and decreased subsequently with the increasing of Pb2+ and Cd2+ concentrations, and these concentrations negatively affected the germination index and vigor index. Meanwhile, there had an inhibitory action between Pb2+, Cd2+ and roots growth, stems growth and biomass accumulation, and this action was enhanced by the increasing of concentration in solution, especially for seedling roots, the inhibitory ratio could up to 96.20% and 94.00% at most, respectively. Although the increase of Pb2+ and Cd2+ concentrations in solution significantly increased both on the aboveground part and underground part, the accumulation amount underground were much higher than the former. The maximum differences between the aboveground and underground could be up to 27.21 times (for Pb2+) and 6.25 times (for Cd2+) at the same concentrations.
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Key words:
- heavy metal
- / seed
- / germination rate
- / Phyllostachys edulis
- / Pb2+
- / Cd2+
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