Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, 310058, People's Republic of China.
Plant Physiology Division, Bangladesh Agricultural Research Institute, Gazipur, 1701, Bangladesh.
Environ Sci Pollut Res Int. 2022 Mar;29(14):20721-20730. doi: 10.1007/s11356-021-16991-9. Epub 2021 Nov 6.
Soil cadmium (Cd) contamination poses adverse impacts on crop yield and quality. Maize is a widely cultivated cereal throughout the world. In this study, field and hydroponic experiments were conducted to investigate the genotypic difference in Cd accumulation and tolerance in maize. There were significant genotypic differences in grain Cd concentrations among 95 genotypes. From these 95 genotypes, L42 which showed a higher grain Cd concentration and L63 which showed a lower grain Cd concentration was selected for further study. Under Cd stress, L63 showed much less reduction in plant growth than L42 compared with the control. Seedlings of L63 recorded higher Cd concentration in roots, but lower in shoots L42, indicating that the low grain Cd concentration in L63 is mainly due to the low rate of transportation of Cd from roots to shoots. Most Cd accumulated in epidermis and xylem vessels of L63, while the green fluorescent was found across almost the entire cross-section of root in L42. Obvious ultrastructural damage was observed in L42 under Cd stress, especially in mesophyll cells, while L63 was less affected. These findings could contribute to developing low Cd accumulation and high tolerance maize cultivars.
土壤镉（Cd）污染对作物产量和质量构成不利影响。玉米是全世界广泛种植的一种谷类作物。本研究通过田间和水培实验，研究了玉米对 Cd 积累和耐性的基因型差异。在 95 个基因型中，籽粒 Cd 浓度存在显著的基因型差异。从这 95 个基因型中，选择了籽粒 Cd 浓度较高的 L42 和籽粒 Cd 浓度较低的 L63 进一步研究。在 Cd 胁迫下，与对照相比，L63 植株的生长受抑制程度明显低于 L42。L63 的根中 Cd 浓度较高，但地上部 Cd 浓度较低，表明 L63 的低籽粒 Cd 浓度主要是由于 Cd 从根部向地上部运输的速率较低。大部分 Cd 积累在 L63 的表皮和木质部导管中，而在 L42 中则几乎可以在整个根部横截面上观察到绿色荧光。在 Cd 胁迫下，L42 中观察到明显的超微结构损伤，尤其是叶肉细胞，而 L63 受影响较小。这些发现有助于开发低 Cd 积累和高耐性的玉米品种。
