Galicia-Campos Estrella, García-Villaraco Velasco Ana, Montero-Palmero Mᵃ Belén, Gutiérrez-Mañero F Javier, Ramos-Solano Beatriz
Faculty of Pharmacy, Universidad San Pablo-CEU Universities, 28668 Madrid, Spain.
Plants (Basel). 2022 Oct 17;11(20):2748. doi: 10.3390/plants11202748.
Climate change consequences for agriculture involve an increase of saline soils which results in lower crop yields due to increased oxidative stress in plants. The present study reports the use of Plant Growth Promoting Bacteria (PGPB) as a tool to modulate plant innate mechanisms of adaptation to water stress (salinity and drought) in one year-old olive plantlets var. Arbosana and Arbequina. Integration of external changes in plants involve changes in Reactive Oxygen Species (ROS) that behave as signals to trigger plant adaptative mechanisms; however, they become toxic in high concentrations. For this reason, plants are endowed with antioxidant systems to keep ROS under control. So, the working hypothesis is that specific beneficial strains will induce a systemic response able to modulate oxidative stress and improve plant adaptation to water stress. Ten strains were assayed, evaluating changes in photosynthesis, pigments, ROS scavenging enzymes and antioxidant molecules, osmolytes and malondialdehyde, as oxidative stress marker. Photosynthesis and photosynthetic pigments were the most affected variables. Despite the specific response of each variety, the favorite targets of PGPBs to improve plant fitness were photosynthetic pigments and the antioxidant pools of glutathione and ascorbate. Our results show the potential of PGPBs to improve plant fitness modulating oxidative stress.
气候变化对农业的影响包括盐渍土增加，这会导致植物氧化应激增加，从而降低作物产量。本研究报告了使用植物促生细菌（PGPB）作为一种工具，来调节一年生橄榄幼苗品种阿尔博萨纳（Arbosana）和阿尔贝吉纳（Arbequina）适应水分胁迫（盐度和干旱）的植物固有机制。植物外部变化的整合涉及活性氧（ROS）的变化，ROS作为触发植物适应性机制的信号；然而，它们在高浓度时会变得有毒。因此，植物具有抗氧化系统来控制ROS。所以，工作假设是特定的有益菌株将诱导一种系统反应，能够调节氧化应激并改善植物对水分胁迫的适应性。对10个菌株进行了测定，评估了光合作用、色素、ROS清除酶和抗氧化分子、渗透调节物质以及作为氧化应激标志物的丙二醛的变化。光合作用和光合色素是受影响最大的变量。尽管每个品种有特定反应，但PGPB提高植物适应性的最主要作用靶点是光合色素以及谷胱甘肽和抗坏血酸的抗氧化库。我们的结果显示了PGPB通过调节氧化应激来提高植物适应性的潜力。
