Ramana Sivakoti, Biswas Ashis K, Singh Amar B, Ahirwar Narendra K, Prasad Ravulapalli D, Srivastava Sanjay
a Indian Institute of Soil Science , Nabi bagh, Berasia Road, Bhopal , India.
Int J Phytoremediation. 2015;17(7):709-15. doi: 10.1080/15226514.2014.964842.
The present study was conducted to evaluate the ability of a high biomass producing, drought tolerant succulent plant Mauritius hemp (Furcraea gigantea Vent.) for its tolerance to different levels of Cr (0, 25, 50, 100 and 200 mg Cr kg soil(-1)) and its potential for phytoremediation purposes. Based on the data on inhibition of the growth of plants with Cr, tolerance index and grade of growth inhibition, it was observed that the plant could tolerate up to 50 mg Cr kg (-1) soil. Absorption of Cr from soil to plant and its translocation into plant tissues were discussed in terms of bio concentration factor (BCF), transfer factor (TF), and translocation efficiency (TE%). Cr was mainly accumulated in the roots and exclusion of Cr was found to be the principal physiological tolerance mechanism followed by a marked increase in proline, ascorbic acid, total free amino acids in the leaf tissue and malic acid in the rhizosphere samples to counter Cr stress. Based on the tissue concentration of Cr (< 300 μg g(-1) in the leaves and TF<1), it was concluded that, Furcraea gigantea could not be considered a hyperaccumulator and therefore unsuitable for phytoextraction of Cr. Nevertheless, Furcraea gigantea could be a suitable candidate for phytostablization of Cr contaminated soils.
本研究旨在评估高产、耐旱的肉质植物毛里求斯大麻（巨丝兰）对不同水平铬（0、25、50、100和200毫克铬/千克土壤）的耐受性及其植物修复潜力。根据铬对植物生长的抑制数据、耐受指数和生长抑制等级，观察到该植物能够耐受高达50毫克铬/千克土壤。从生物富集系数（BCF）、转移系数（TF）和转运效率（TE%）方面讨论了土壤中铬向植物的吸收及其向植物组织的转运。铬主要积累在根部，发现铬的排斥是主要的生理耐受机制，随后叶组织中的脯氨酸、抗坏血酸、总游离氨基酸以及根际样品中的苹果酸显著增加以应对铬胁迫。基于叶片中铬的组织浓度（<300微克/克）和转移系数<1，得出结论：巨丝兰不能被视为超富集植物，因此不适合用于铬的植物提取。然而，巨丝兰可能是铬污染土壤植物稳定化的合适候选植物。
