Wang Kai-rong, Zhang Lei
Institute of Agricultural Ecology and Environmental Health, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2008 Dec;19(12):2757-62.
Peanut (Arachis hypogaea L.) is a major oil-bearing crop in the world, and as well, an important resource of plant protein and a main raw material for food processing. With the increasing of its direct human consumption and food processing, the Cd concentration in peanut kernel has aroused great concern in recent years. China is a main country of the production and exportation of peanut, but the Cd enrichment in peanut kernel is the main obstacle for its peanut export trade. In this paper, the research advances in Cd pollution of peanut kernel were reviewed, based on the characteristics and mechanisms of Cd accumulation and distribution in peanut kernel, the intra-specific variation of kernel Cd content, and the measures in controlling kernel Cd content. Two strategies were put forward for controlling Cd pollution of peanut kernel, i.e., to reduce the Cd uptake by main root system of peanut plant, and to control the transference of Cd from root to fruit (kernel). In order to applying the strategies effectively, researches on the mechanisms of Cd accumulation in peanut kernel should be enhanced in three aspects, i.e., root vitality and its relationship with Cd accumulation in kernel, mechanism of fruit Cd absorption and its contribution to kernel Cd content, and mechanism of Cd transference in plants and its effects on kernel Cd content.
花生（Arachis hypogaea L.）是世界上主要的油料作物，也是植物蛋白的重要来源和食品加工的主要原料。随着花生直接食用量和食品加工量的增加，近年来花生籽仁中的镉含量引起了人们的极大关注。中国是花生生产和出口大国，但花生籽仁中的镉富集是其花生出口贸易的主要障碍。本文基于花生籽仁中镉积累与分布的特征和机制、籽仁镉含量的种内变异以及控制籽仁镉含量的措施，综述了花生籽仁镉污染的研究进展。提出了控制花生籽仁镉污染的两种策略，即减少花生植株主根系对镉的吸收，以及控制镉从根向果实（籽仁）的转运。为有效实施这些策略，应从三个方面加强花生籽仁镉积累机制的研究，即根系活力及其与籽仁镉积累的关系、果实镉吸收机制及其对籽仁镉含量的贡献、植物体内镉转运机制及其对籽仁镉含量的影响。
