Environmental Biology Unit, Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria.
Department of Environmental Biotechnology Division, CSIR-NEERI, Nagpur, India.
Int J Phytoremediation. 2019;21(13):1341-1355. doi: 10.1080/15226514.2019.1633258. Epub 2019 Jul 9.
Biology, tolerance, and metal (Pb and Cr) accumulating ability of were studied under hydroponic conditions. The seedlings were raised in Hoagland's solution containing different concentrations of Pb (0, 500, 1000, 1500, 2000, 3000, 4000, and 5000 mg l) and Cr (0, 50, 100, 150, 200, 300, and 400 mg l). Biomass and metal accumulation in different plant parts were determined at seven (7) and fourteen (14) days after stress. Antioxidant enzyme activities, protein, and proline contents were estimated in stressed and unstressed plants. was able to tolerate Pb and Cr concentrations up to 4000 and 100 mg l, respectively in hydroponic solution. Metal accumulation was concentration and duration dependent with the highest Pb (21,127.90 and 117,985.29 mg kg) and Cr (3130.85 and 2428.90 mg kg) in shoot and root, respectively found in the plants exposed to 5000 mg l Pb and 400 mg l Cr for 14 days. Proline, antioxidant enzyme activities, and protein contents were the highest in plant exposed to higher Pb and Cr concentrations for 7 and 14 days. could be considered as Pb and Cr accumulator with proline and increase in antioxidant enzyme activities being the tolerance mechanisms.
在水培条件下研究了生物、耐受性和金属（Pb 和 Cr）积累能力。将幼苗在含有不同浓度 Pb（0、500、1000、1500、2000、3000、4000 和 5000 mg l）和 Cr（0、50、100、150、200、300 和 400 mg l）的 Hoagland 溶液中培养。在胁迫后 7（7）和 14（14）天，测定了不同植物部位的生物量和金属积累量。在胁迫和未胁迫的植物中估计了抗氧化酶活性、蛋白质和脯氨酸含量。在水培溶液中，能够耐受 Pb 和 Cr 浓度分别高达 4000 和 100 mg l。金属积累与浓度和时间有关，在暴露于 5000 mg l Pb 和 400 mg l Cr 14 天的植物中，茎叶中 Pb（21,127.90 和 117,985.29 mg kg）和 Cr（3130.85 和 2428.90 mg kg）的积累最高。在暴露于较高 Pb 和 Cr 浓度 7 和 14 天的植物中，脯氨酸、抗氧化酶活性和蛋白质含量最高。可以将其视为 Pb 和 Cr 的积累者，脯氨酸的增加和抗氧化酶活性的提高是其耐受机制。
