Phytoremediation potential of mustard (Brassica juncea) varieties exposed to lead stress

T. Chakrobarty, J. Naher, M. Noor, U. Nath
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Abstract

While the growth of most plants is severely restricted by the toxic effects lead (Pb), some (plants) can cope with the heavy metal stress. These hyperaccumulators are used to extract (lead) from contaminated soil in a process called phytoremediation. Although some species of Brassica are widely being used as hyperaccumulators, the phytoremediation potential of many varieties of Brassica juncea (mustard) is not well understood. The present study was conducted to assess the phytoremediation potentials of 11 mustard genotypes under Pb stress. Twenty-day-old seedlings were exposed to 200 µM Pb nitrate under hydroponic conditions and grown for 60 days. The experiment was conducted following a completely randomized design with three replications.  In response to Pb stress, a significant reduction in growth of the studied traits was observed in all of the varieties. The lowest reduction for all of the studied traits including Pb accumulation was recorded in BJ DH 17. Nevertheless, the translocation of Pb from root to shoot and shoot to grain was highest in Sambal. Bioaccumulation co-efficient was highest in Sambal whereas it was lowest in BJ DH 17. Based on the results of the present study, the variety Sambal is recognized as the most suitable genotype that can be used for Pb phytoextraction. Asian Australas. J. Biosci. Biotechnol. 2019, 4 (2), 80-87
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铅胁迫下芥菜(Brassica juncea)品种的植物修复潜力
虽然大多数植物的生长受到铅(Pb)的毒害作用的严重限制,但有些(植物)能够应对重金属胁迫。这些超蓄能器被用于从污染土壤中提取铅,这一过程被称为植物修复。尽管一些芸苔属植物被广泛用作超蓄积物,但许多芸苔属植物的修复潜力尚不清楚。研究了11种芥菜基因型在Pb胁迫下的植物修复能力。20日龄的幼苗在水培条件下暴露于200µM硝酸铅中,生长60 d。试验采用完全随机设计,重复3次。在Pb胁迫下,所有品种的各性状生长均显著降低。包括铅积累量在内的所有性状均以bjdh17降低幅度最小。然而,铅从根到地上部和地上部到籽粒的转运在三巴中最高。生物积累效率最高的是参巴尔,最低的是bjdh17。根据本研究结果,认为Sambal品种是最适合提取Pb的基因型。亚洲Australas。j . Biosci。生物技术,2019,4 (2),80-87
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