摘要:Cd毒性强,通过多种途径进入土壤,被植物吸收并积累,当Cd超过一定浓度以后,就会影响植物的生长发育和生理生化过程,如植物的外部形态变化,植株萎缩,对细胞结构有所破坏,光合作用受阻,蒸腾作用也受影响,干扰植物代谢,从而影响作物品质和产量。本实验使用食用量大的叶菜—生菜作为研究材料,采用水培和土培两种培养方法培养生菜,待其长到三叶一心时用叶面喷洒的方式处理材料生菜。处理两周后收苗,测生菜地上地下部的干重、鲜重、Cd含量。实验结果表明水培组乙烯、脱落酸,土培组硝普钠对减少镉吸收有较为显著的效果。而硫酸锌和富氢水的效果不显著。43576
A Preliminary Study on Chemical Regulation of Cadmium Absorption in Vegetable
Abstract:Cd is highly toxic and enters the soil through a variety of ways. It absorbs and accumulates by plants. When Cd exceeds a certain concentration, it will affect plant growth and physiological and biochemical processes, such as plant external morphological changes, plant shrinking, Destruction, photosynthesis blocked, transpiration is also affected, interfere with plant metabolism, thus affecting crop quality and yield. In this experiment, we used lettuce as the research materials, and the lettuce was cultivated by hydroponics and soil. The lettuce was treated with foliar spray when it was at three leaves one mind stage. After two weeks of treatment, the dry weight, fresh weight and Cd content of the ground and underground parts were measured. The results showed that the abscisic acid and Ethylene in the hydroponic culture and sodium nitroprusside in soil culture had a significant effect on reducing cadmium uptake. While the effect of zinc sulfate and hydrogen-rich water is not significant.
Key words: Cd;lettuce;Heavy metals;Chemical regulation
目 录
摘要1
关键词1
Abstract1
Key words1
引言2
1 研究背景2
2材料与方法3
2.2.1霍格兰营养液水培法培养生菜 3
2.2.2土培法培养生菜3
2.2相关指标的测定3
2.2.1株高根长的测定3
2.2.2干重鲜重的测定4
2.2.3镉含量的测定4
2.3数据处理 4
3 结果与分析 4
3.1 水培组生菜指标分析4
3.1.1不同处理对水培生菜镉积累的影响5
3.1.2不同处理对水培生菜鲜重的影响5
3.1.3不同处理对水培生菜干重的影响5
3.1.4不同处理对水培生菜根长和株高的影响5
3.1.5 不同处理水培生菜形态差异6
3.1.6 水培不同处理的生菜根冠比和转运系数6
3.2 土培组生菜指标分析7
3.2.1不同处理对土培生菜镉积累的影响7
3.2.2不同处理对土培生菜鲜重的影响7
3.2.3不同处理对土培生菜干重的影响7
3.2.4 不同试剂处理对Cd土培养生菜的根冠比、转运系数的影响8
4讨论8
致谢9
参考文献9
阻隔蔬菜镉吸收的化学调控方法的初步研究
Cd流入食物链,人类食用后会严重影响身体健康。蔬菜是对生长条件要求很高、而且人类食用量巨大的农作物。选择蔬菜作为研究对象, 对制定不同作物土壤环境质量标准,保证食品安全作用重大,镉是土壤中最常见的重金属污染元素之一,并且在土壤中有较强的化学活性,有很强的生物毒性。与其他重金属相比,更易被作物吸收,通过食物链进入人体,损害人体健康。不同种类的蔬菜对镉元素的吸收能力有显著性差异,叶菜类的吸收能力大于果菜类蔬菜,叶菜类蔬菜其吸收系数变异性较大,而果菜类较小[4]。蔬菜镉吸收的化学调控剂到底有哪些和其可能调控机理是本实验所探讨的主要问题。以便于筛选出对蔬菜有阻镉效果的化学试剂,并为后续的浓度展开和详细的机制研究做准备。 阻隔蔬菜镉吸收的化学调控方法的初步研究:http://www.751com.cn/shengwu/lunwen_44476.html