College of Horticulture, Sichuan Agricultural University, Chengdu, China.
Institute of Pomology and Olericulture, Sichuan Agricultural University, Chengdu, China.
Int J Phytoremediation. 2023;25(3):350-358. doi: 10.1080/15226514.2022.2085239. Epub 2022 Jun 14.
The cadmium (Cd) contaminated agricultural soil has become serious in recent years, but it will take long time for Cd-hyperaccumulator to remedy. To speed up the remediation of agricultural soil and achieve the safe agricultural production as soon as possible, the potential Cd-hyperaccumulator Nakamura et Odashima was intercropped with its post-grafting generations in Cd-contaminated soil. Intercropping increased the biomass, Cd contents and Cd extractions of and its post-grafting generations in the pot and field experiments. Both the whole plant or shoot biomass and the Cd extraction by whole plant or shoot in intercroppings had a linear regression relationship with that in monocultures. In the field experiment, intercropping increased the shoot Cd extraction of by 9.86%-40.06% compared with the monoculture. Intercropping increased the content of chlorophyll, activity of superoxide dismutase, activity of catalase, and soluble protein content of and its post-grafting generations but reduced their peroxidase activities in the pot experiment. Therefore, intercropping with its post-grafting generations can improve their phytoremediation ability, and the best choice is intercropped with its post-grafting generation of wild potato rootstock. Intercropping Nakamura et Odashima with its post-grafting generations could mutually promote the Cd accumulation in the two types of plant species, and improve their phytoremediation ability for remedying the Cd-contaminated soil.
近年来，镉（Cd）污染的农田土壤问题日益严重，但超积累植物的修复时间较长。为了加速农田土壤的修复，尽快实现安全的农业生产，将 Cd 超积累植物 Nakamura et Odashima 及其嫁接后代与 Cd 污染土壤进行间作。在盆栽和田间试验中，间作增加了和其嫁接后代的生物量、Cd 含量和 Cd 提取量。间作的整株或地上部分生物量和 Cd 提取量与单作呈线性回归关系。在田间试验中，与单作相比，间作增加了 9.86%-40.06%的地上部 Cd 提取量。间作增加了和其嫁接后代的叶绿素含量、超氧化物歧化酶活性、过氧化氢酶活性和可溶性蛋白含量，但降低了过氧化物酶活性。因此，间作可以提高其植物修复能力，最好选择与野生马铃薯砧木的嫁接后代进行间作。间作可以相互促进两种植物对 Cd 的积累，提高它们对 Cd 污染土壤的修复能力。
