Evaluation of Pantoea anthophila Y-7 as A Causative Agent of Brown Spot in Polygonum cuspidatum Isolated from Henan, China
Zi-qing Chen, Nimaichand Salam, Xu Zhao, Yu Wang, Jin-Tao Fang, Rong Shi, Manik Prabhu Narsing Rao* and Bing-Bing Liu** Author for corresponding; e-mail address: liubingbing200666@163.com, deene.manik@gmail.com, manik.35540@lpu.co.in
ORCID ID: https://orcid.org/0000-0002-4777-3452
Volume: Vol.53 No.6 (November 2026: In progress)
Research Article
DOI: https://doi.org/10.12982/CMJS.2026.111
Received: 13 March 2026, Revised: 13 August 2026, Accepted: 6 October 2026, Published: -
Citation: Chen Z.-q., Salam N., Zhao X., Wang Y., Fang J.-T., Shi R., et al., Evaluation of Pantoea anthophila Y-7 as a causative agent of brown spot in Polygonum cuspidatum isolated from Henan, China. Chiang Mai Journal of Science, 2026; 53(6): e2026111. DOI 10.12982/CMJS.2026.111.
Graphical Abstract
Abstract
Polygonum cuspidatum is a medicinally important plant; however, it is susceptible to microbial diseases that adversely affect its growth and productivity. In this study, 22 bacterial strains were isolated from diseased tissues of P. cuspidatum in Nanyang City, Henan Province, China. In vitro and in vivo pathogenicity assays were conducted, and among the 22 bacterial strains tested, only strain Y-7 was able to induce brown spot symptoms on the leaves of P. cuspidatum. Strain Y-7 was successfully re-isolated from diseased leaves following inoculation, thereby fulfilling Koch's postulates and confirming it as the causal agent of leaf brown spot in P. cuspidatum. Strain Y-7 was identified as Pantoea anthophila based on morphological, physiological, biochemical, and genome analysis. These findings provide valuable insights into the characteristics of this pathogen and may support the development of effective disease management strategies.