The phytoremediation effect of Medicago scutellata (L.) Mill. on soils under Cd–water stress: a good choice for contaminated dry lands
Environmental Science and Pollution Research(2019)
摘要
Recently, due to increased drought risks, need for crops with higher water stress tolerance has increased strongly. Those crops have a wide range of uses such as supplying food as well as land restoration. Medicago scutellata (L.) Mill. is a Fabaceae widely cultivated for its capacity to produce high-quality forage. This study was designed as a factorial experiment based on a completely randomized design with three replications. Different cadmium levels were the first factor and included 0, 5, 25, 50, 100, and 125 mg kg −1 . Second factor was the drought stress, which had three levels (100, 75, and 50% feed consumption). According to the results, Cd uptake in different organs increased with increasing Cd levels up to 100 mg kg −1 while the water stress had a negative effect on Cd uptake by M. scutellata . Average concentration of Cd in the leaves, stems, and roots were 63.16, 30.12, and 20.45 mg kg −1 , respectively. The high value of translocation factor (TF) confirms the high ability of M. scutellata in translocation Cd from root to shoot. Fe, Zn, and K concentration of different organs significantly decreased with increasing Cd level. Fe and Zn concentration increased by increasing water stress levels in all organs and K concentration of roots decreased while in leaves and shoots increased by increasing water stress level. These results indicate that M. scutellata has a good ability for eliminating Cd from contaminated soil attribute to its powerful absorption and accumulation for Cd. It also showed a good performance under the co exposure of water stress and Cd indicated by accumulating proline and K in leaves.
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关键词
Phytoremediation,Water stress,Animal consumption,Translocation factor
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