Najafi Zilaie Mahmood, Mosleh Arani Asghar, Etesami Hassan
Department of Environmental Sciences, Faculty of Natural Resources, Yazd University, Yazd, Iran.
Department of Soil Science, University of Tehran, Tehran, Iran.
Front Plant Sci. 2023 Mar 10;14:1098368. doi: 10.3389/fpls.2023.1098368. eCollection 2023.
Dust causes adverse effects on the physiological and biochemical characteristics of plants and limits their use in the development of the green belt. Air Pollution Tolerance Index (APTI) is an important tool to screen out plants, based on their tolerance or sensitivity level to different air pollutants. The aim of this study was to investigate the effect of two plant growth-promoting bacterial strains ( SB and HR) and their combination as a biological solution on APTI of three desert plant species of , and under dust stress (0 and 1.5 g m 30 days). Dust caused a significant decrease of 21% and 19%, respectively, in the total chlorophyll of and , an 8% decrease in leaf relative water content, a 7% decrease in the APTI of , and a decrease of 26 and 17% in protein content of and , respectively. However, SB increased the amount of total chlorophyll in and by 236% and 21%, respectively, and the amount of ascorbic acid by 75% and 67% in and , respectively. HR also increased the leaf relative water content in and by 10% and 15%, respectively. The inoculation with HR, SB and the combination of these two isolates decreased the activity of peroxidase by 70%, 51%, and 36%, respectively, in , and 62%, 89%, and 25% in , respectively. These bacterial strains also increased the concentration of protein in all three desert plants. Under dust stress, had a higher APTI than the other two species. SB, which had been isolated from , was more effective than HR in alleviating the effects of dust stress on this plant. Therefore, it was concluded that plant growth-promoting rhizobacteria can be effective at improving the mechanisms of plant tolerance to air pollution in the green belt.
灰尘会对植物的生理和生化特性产生不利影响，并限制其在绿化带建设中的应用。空气污染耐受指数（APTI）是一种基于植物对不同空气污染物的耐受或敏感程度来筛选植物的重要工具。本研究的目的是调查两种促进植物生长的细菌菌株（SB和HR）及其组合作为生物制剂，在沙尘胁迫（0和1.5 g/m³，持续30天）下对三种沙漠植物物种（梭梭、白刺和沙拐枣）APTI的影响。沙尘导致梭梭和白刺的总叶绿素分别显著下降21%和19%，叶片相对含水量下降8%，沙拐枣的APTI下降7%，梭梭和白刺的蛋白质含量分别下降26%和17%。然而，SB分别使梭梭和白刺的总叶绿素含量增加了236%和21%，使梭梭和白刺的抗坏血酸含量分别增加了75%和67%。HR也分别使梭梭和白刺的叶片相对含水量增加了10%和15%。接种HR、SB以及这两种菌株的组合分别使梭梭中过氧化物酶的活性降低了70%、51%和36%，在白刺中分别降低了62%、89%和25%。这些细菌菌株还提高了所有三种沙漠植物中的蛋白质浓度。在沙尘胁迫下，梭梭的APTI高于其他两个物种。从梭梭中分离出的SB在减轻沙尘胁迫对该植物的影响方面比HR更有效。因此，得出结论：促生根际细菌可以有效地改善植物对绿化带空气污染的耐受机制。
