PDF(Pubmed)
Abstract：
Salt stress is one of the significant abiotic stress factors that exert harmful effects on plant growth and yield. In this study, five cultivars of mung bean (Vigna radiata L.) were treated with different concentrations of NaCl and also inoculated with a salt-tolerant bacterial strain to assess their growth and yield. The bacterial strain was isolated from the saline soil of Sahiwal District, Punjab, Pakistan and identified as Bacillus pseudomycoides. Plant growth was monitored at 15-days interval and finally harvested after 120 days at seed set. Both sodium and potassium uptake in above and below-ground parts were assessed using a flame photometer. Fresh and dry mass, number of pods, seeds per plant, weight of seeds per plant and weight of 100 seeds reduced significantly as the concentration of NaCl increased from 3 to 15 dSm-1. There was a significant reduction in the growth and yield of plants exposed to NaCl stress without bacterial inoculum compared to the plants with bacterial inoculum. The latter plants showed a significant increase in the studied parameters. It was found that the cultivar Inqelab mung showed the least reduction in growth and yield traits among the studied cultivars, while Ramzan mung showed the maximum reduction. Among all the cultivars, maximum Na+ uptake occurred in roots, while the least uptake was observed in seeds. The study concludes that NaCl stress significantly reduces the growth and yield of mung bean cultivars, but Bacillus pseudomycoides inoculum alleviates salt stress. These findings will be helpful to cultivate the selected cultivars in soils with varying concentrations of NaCl.
摘要：
盐胁迫是影响植物生长和产量的重要非生物胁迫因子之一。在这项研究中,用不同浓度的NaCl处理了五个绿豆品种（VignaradiataL.），并接种了耐盐细菌菌株以评估其生长和产量。该菌株是从Sahiwal区的盐渍土壤中分离出来的，旁遮普,巴基斯坦并鉴定为假孢子菌。以15天的间隔监测植物生长,最后在种子结实120天后收获。使用火焰光度计评估地上和地下部分的钠和钾吸收。新鲜和干燥的质量，豆荚的数量,每株植物的种子，随着NaCl浓度从3dSm-1增加到15dSm-1，每株植物的种子重量和100个种子的重量显着降低。与具有细菌接种物的植物相比,在没有细菌接种物的情况下暴露于NaCl胁迫的植物的生长和产量显著降低。后一种植物显示出研究参数的显着增加。发现在研究的品种中，Inqelabmung品种的生长和产量性状下降最少，而Ramzanmung表现出最大的减少。在所有品种中，最大的Na+吸收发生在根中，而在种子中观察到的吸收最少。研究结果表明,NaCl胁迫显著降低了绿豆品种的生长和产量,但是假芽孢杆菌接种物可以缓解盐胁迫。这些发现将有助于在不同NaCl浓度的土壤中培养选定的品种。
