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首页> 外文期刊>African Journal of Biotechnology >Physiological, biochemical and molecular responses of common bean (Phaseolus vulgaris L.) plants to heavy metals stress
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Physiological, biochemical and molecular responses of common bean (Phaseolus vulgaris L.) plants to heavy metals stress

机译：菜豆（Phaseolus vulgaris L.）植物对重金属胁迫的生理，生化和分子响应

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Heavy metals are essential and important for plants growth, and play as key components of many vital compounds. However, when they increase in concentration, heavy metals show symptoms such as growth delay and inhibition of biochemical reactions. The current study focused on the impact of five heavy metals (lead, chromium, nickel, cadmium, zinc) on growth and performance of common bean (Phaseolus vulgaris?L. cv. Nebraska) plants before and after liming (CaCO3? + MgCO3) as soil correction treatment for the sake of remediation for heavy metal pollution in soil. Chemical analysis of carbohydrates showed significant increases in the contents of reducing sugars in response to lead, cadmium and nickel stress, which were decreased by liming treatments. The contents of total soluble sugars also increased in all heavy metal-treated plants but zinc. All heavy metals significantly lowered the leaf contents of the photosynthetic pigments (chlorophyll a, chlorophyll b and carotenoids). The sodium dodecyl sulphate polyacrylamide gel electrophoreseis (SDS-PAGE) of proteins indicated variations in the profile of electrophoretic protein bands in heavy metal-stressed common bean plants before and after liming. The results indicate that the investigated heavy metals were absorbed from the soil solution and then accumulated in the tissues of common bean plants in variable concentrations. The highest accumulation were lead (Pb) and chromium (Cr) then cadmium (Cd), zinc (Zn) and nickel (Ni) while the magnitude of limiting the retarding rate of absorption and accumulation was: Pb > Ni > Cr > Zn > Cd, respectively.
机译：重金属对于植物的生长至关重要，并且是许多重要化合物的关键成分。但是，当它们的浓度增加时，重金属会显示出诸如生长延迟和生化反应抑制等症状。当前的研究集中在五种重金属（铅，铬，镍，镉，锌）对石灰（CaCO3？+ MgCO3）浸种前后普通豆类植物（菜豆）的生长和性能的影响。为了纠正土壤中的重金属污染而进行的土壤校正处理。碳水化合物的化学分析表明，响应铅，镉和镍胁迫，还原糖的含量显着增加，但通过石灰处理降低了。除锌外，所有重金属处理过的植物中总可溶性糖含量也增加。所有重金属均显着降低了光合色素（叶绿素a，叶绿素b和类胡萝卜素）的叶片含量。蛋白质的十二烷基硫酸钠聚丙烯酰胺凝胶电泳（SDS-PAGE）表明，在浸灰前后，重金属胁迫的普通豆类植物中电泳蛋白质条带的分布均发生变化。结果表明，所研究的重金属从土壤溶液中吸收，然后以不同的浓度积累在普通豆类植物的组织中。最高的累积量是铅（Pb）和铬（Cr），然后是镉（Cd），锌（Zn）和镍（Ni），而限制吸收和累积延迟速率的幅度为：Pb> Ni> Cr> Zn>镉。

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