Plant growth-promoting bacteria that decrease heavy metal toxicity in plants
Plant growth-promoting bacteria that decrease heavy metal toxicity in plants
复制标题
DOI：
10.1139/cjm-46-3-237
复制
发表时间：
2000-03-01
影响因子：
2.8
通讯作者：
Glick, BR
中科院分区：
文献类型：
--
作者：
Burd, GI;Dixon, DG;Glick, BR
抗坏血酸克鲁维氏菌SUD 165及其铁载体高产突变株K.抗坏血酸SUD 165/26，用于接种番茄、油菜和印度芥菜种子，然后在镍、铅或锌的存在下在土壤中生长25-42天。监测的参数包括植物的湿重和干重，植物叶片中的蛋白质和叶绿素含量，以及植物根和芽中的重金属浓度。如这些参数的测量值的降低所示，在所有情况下，植物生长被添加的金属的存在抑制。两种细菌菌株都有效，虽然不总是在统计学上显著的程度，在缓解由金属引起的生长抑制的一部分。在大多数情况下，铁载体高产突变体K。抗坏血酸165/26对植物生长的影响比野生型K.抗坏血酸SUD 165。这些数据表明，这些细菌保护植物免受高浓度镍、铅和锌的抑制作用的能力与细菌为植物提供足够的铁有关。
Kluyvera ascorbata SUD165 and a siderophore-overproducing mutant of this bacterium, K. ascorbata SUD165/26, were used to inoculate tomato, canola, and Indian mustard seeds which were then grown in soil for 25-42 days in the presence of either nickel, lead, or zinc. The parameters that were monitored included plant wet and dry weight, protein and chlorophyll content in the plant leaves, and concentration of heavy metal in the plant roots and shoots. As indicated by a decrease in the measured values of these parameters, in all instances, plant growth was inhibited by the presence of the added metal. Both bacterial strains were effective, although not always to a statistically significant extent, at relieving a portion of the growth inhibition caused by the metals. In most cases, the siderophore overproducing mutant K. ascorbata 165/26 exerted a more pronounced effect on plant growth than did the wild-type bacterium K. ascorbata SUD165. The data suggest that the ability of these bacteria to protect plants against the inhibitory effects of high concentrations of nickel, lead, and zinc is related to the bacteria providing the plants with sufficient iron.