Ettadili Hamza, Aksoy Behiye Nur, Vural Caner
Faculty of Science, Department of Biology, Division of Molecular Biology, Pamukkale University, 20160, Denizli, Türkiye.
Curr Microbiol. 2025 Jul 24;82(9):405. doi: 10.1007/s00284-025-04384-x.
Purple non-sulfur bacteria (PNSB) are phototrophic microorganisms recognized for their ability to produce compounds beneficial for plant growth, increasing their interest as plant growth-promoting bacteria. This study investigates the growth-promoting traits of Cereibacter sphaeroides PW15 under both microaerobic light and aerobic dark conditions. The findings demonstrate that the PNSB isolate PW15 exhibits notable salt tolerance, phosphate solubilization, nitrogen fixation, and the production of several plant-beneficial metabolites, including indole-3-acetic acid, ammonia, siderophores, and 5-aminolevulinic acid. The presence of the nifH gene, which is associated with Mo-Fe nitrogenase, further confirmed its nitrogen-fixing potential. Additionally, C. sphaeroides PW15 formed biofilm on abiotic surfaces and significantly enhanced root and shoot growth in Arabidopsis thaliana ecotype Col-0 upon inoculation. These results highlight the potential of C. sphaeroides PW15 as a promising candidate for use as an effective biofertilizer in sustainable agriculture.
紫色非硫细菌（PNSB）是一类光合微生物，因其能够产生对植物生长有益的化合物而受到关注，这使得它们作为促进植物生长的细菌越来越受人们的青睐。本研究调查了球形脑杆菌PW15在微需氧光照和需氧黑暗条件下的促生长特性。研究结果表明，PNSB分离株PW15具有显著的耐盐性、解磷能力、固氮能力，并能产生多种对植物有益的代谢产物，包括吲哚-3-乙酸、氨、铁载体和5-氨基乙酰丙酸。与钼铁固氮酶相关的nifH基因的存在进一步证实了其固氮潜力。此外，球形脑杆菌PW15能在非生物表面形成生物膜，接种后能显著促进拟南芥生态型Col-0的根和地上部分生长。这些结果凸显了球形脑杆菌PW15作为可持续农业中有效生物肥料的潜在应用价值。
