A field study of chromium and cadmium uptake, accumulation and tolerance in alligator weed, Alternanthera philoxeroides (Mart.) Griseb

作者：Pal Suparna^*; Kundu Rita

来源：Proceedings of the National Academy of Sciences India Section B-Biological Sciences, 2011, 81: 404-410.

• Alternanthera philoxeroides
• Cd and Cr tolerance
• carotenoids
• proline
• chlorophyll

Chromium (Cr) and cadmium (Cd) contamination is one of the most pressing threats to environment as well as human health in Kolkata and adjoining suburban areas. Field investigations were conducted to study the tolerance of alligator weed, Alternanthera philoxeroides (Mart.) Griseb to chromium and cadmium, Levels of Cr and Cd collected, from the top 10 cm. layer of the soil were found to be significantly higher than their normal distribution. Plants collected from all the places except one are found to accumulate higher concentrations of Cr in the roots than in the shoots. Although the bioaccumulation of Cr is not directly proportional to its concentration in the polluted soil, but Cd bioaccumulation is directly proportional to its concentration in the soil. Cd accumulation is more in roots than in shoots. Certain biochemical parameters such as total chlorophyll, carotenoid and free proline content were studied to relate them with the weed's metal detoxification capacity. Total chlorophyll content was adversely affected with increasing concentrations of Cr and Cd in the plant. Increased level of carotenoid and free proline accumulation has been found to be the metal detoxifying strategies of this herb. This has been found tolerant to Cr and Cd which can grow well in the soil contaminated with high concentration of Cr and Cd under field conditions and could be exploited for phytoremediation of multiple contaminated sites of major polluted cities.

• 出版日期2011-12