Pacheco da Silva Maria Letícia, Moen Francesco S, Liles Mark R, Feng Yuchen, Sanz-Saez Alvaro
Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, AL 36849, USA.
Department of Biological Sciences, Auburn University, Auburn, AL 36849, USA.
Plants (Basel). 2022 Apr 22;11(9):1138. doi: 10.3390/plants11091138.
Plant growth-promoting rhizobacteria (PGPR) effects on plant yield are highly variable under field conditions due to competition with soil microbiota. Previous research determined that many PGPR strains can use pectin as a sole carbon source and that seed inoculation with PGPR plus pectin-rich orange peel (OP) can enhance PGPR-mediated increases in plant growth. Because the previous studies used a single soybean cultivar, the objective of this research was to test the effect of PGPR plus OP inoculation on plant responses in a wide range of soybean cultivars. Preliminary screening with 20 soybean cultivars in the greenhouse showed that the PGPR plus OP produced a positive increase in all plant growth parameters when all cultivar data was averaged. However, when the inoculation response was examined cultivar by cultivar there was a range of cultivar response from a 60% increase in growth parameters to a 12% decrease, pointing to the presence of a cultivar-PGPR specificity. Further greenhouse and field experiments that studied cultivars with contrast responses to synbiotic inoculation revealed that the environment and/or the molecular interactions between the plant and microorganisms may play an important role in plant responsiveness.
由于与土壤微生物群存在竞争关系，在田间条件下，促植物生长根际细菌（PGPR）对植物产量的影响差异很大。先前的研究表明，许多PGPR菌株能够将果胶作为唯一碳源，并且用PGPR加上富含果胶的橙皮（OP）对种子进行接种，可以增强PGPR介导的植物生长促进作用。由于之前的研究使用的是单一大豆品种，因此本研究的目的是测试PGPR加OP接种对多种大豆品种植物反应的影响。在温室中对20个大豆品种进行的初步筛选表明，当对所有品种的数据进行平均时，PGPR加OP对所有植物生长参数均产生了正向增加作用。然而，当逐个品种检查接种反应时，发现品种反应范围从生长参数增加60%到减少12%不等，这表明存在品种与PGPR之间的特异性。进一步的温室和田间试验研究了对共生接种有不同反应的品种，结果表明环境和/或植物与微生物之间的分子相互作用可能在植物反应中起重要作用。
