Anju A. B. Please, read Prameela, T.P., Suseela Bhai, R. Bacterial wilt of ginger (Zingiber officinale Rosc.) incited by Ralstonia pseudosolanacearum - A review based on pathogen diversity, diagnostics and management. J Plant Pathol 102, 709–719 (2020). https://doi.org/10.1007/s42161-020-00487-5
Citation: "The third genospecies is named R. pseudosolanacearum sp. nov. for the strains of R. solanacearum that belong to phylotypes I and III (Safni et al. 2014). The ginger bacterial wilt pathogen is grouped under the third genospecies R. pseudosolanacearum."
Ralstonia solanacearum and Ralstonia pseudosolanacearum are both bacterial plant pathogens belonging to the genus Ralstonia. While they share some similarities, there are significant differences between these two species.
Taxonomy and classification:
- Ralstonia solanacearum: It is a species of Gram-negative, non-spore-forming, aerobic bacteria classified under the family Burkholderiaceae.
- Ralstonia pseudosolanacearum: This species is also a Gram-negative, non-spore-forming, aerobic bacterium, and it belongs to the genus Ralstonia
Host range and geographical distribution:
- Ralstonia solanacearum: It is commonly known as the "bacterial wilt" pathogen and affects a broad range of plant species, including solanaceous crops such as tomato, potato, eggplant, and pepper, as well as other economically important plants worldwide. It has a wide geographical distribution.
- Ralstonia pseudosolanacearum: This species primarily affects solanaceous plants, similar to R. solanacearum, but its host range is narrower. It has been reported to cause diseases in some solanaceous weeds and ornamental plants. The geographical distribution of R. pseudosolanacearum is less widespread than R. solanacearum.
Genetic diversity and pathogenicity:
- Ralstonia solanacearum: This species exhibits high genetic diversity and is classified into different races and biovars based on their host range and physiological characteristics. Some races of R. solanacearum are highly pathogenic, capable of infecting a wide range of hosts and causing severe disease.
- Ralstonia pseudosolanacearum: It shows less genetic diversity compared to R. solanacearum. There are currently no known races or biovars of R. pseudosolanacearum. While it can cause disease in solanaceous plants, it is generally considered less virulent
Ralstonia solanacearum and Ralstonia pseudosolanacearum are two closely related bacterial species that belong to the genus Ralstonia. While they share similarities, there are some notable differences between the two:
It is important to note that Ralstonia solanacearum and Ralstonia pseudosolanacearum are genetically distinct species, although they share similarities in their ecological niche and ability to cause plant diseases. Accurate identification and differentiation between these species are critical for implementing appropriate disease management strategies and quarantine measures.
According to Safni et al., 2014, they introduced the division of " species complex" into three genospecies : Ralstonia solanacearum, R.pseudosolanacearum,. and R. syzygii. R. pseudosonacearum is composed of R. solanacearum strains that belong to phylotypes I and III.
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