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  • Title: Rhizobium capsici sp. nov., isolated from root tumor of a green bell pepper (Capsicum annuum var. grossum) plant.
    Author: Lin SY, Hung MH, Hameed A, Liu YC, Hsu YH, Wen CZ, Arun AB, Busse HJ, Glaeser SP, Kämpfer P, Young CC.
    Journal: Antonie Van Leeuwenhoek; 2015 Mar; 107(3):773-84. PubMed ID: 25555455.
    Abstract:
    A novel, Gram-staining-negative, rod-shaped, aerobic and motile bacterium, designated strain CC-SKC2(T), was isolated from the root tumor of a green bell pepper (Capsicum annuum var. grossum) plant in Taiwan. Cells were positive for oxidase and catalase activities and exhibited growth at 25-37 °C, pH 4.0-9.0 and tolerated NaCl concentrations up to 4.0 % (w/v). Strain CC-SKC2(T) is able to trigger nodulation in soybean (Glycine max Merr.), but not in Capsicum annuum var. grossum, red bean (Vigna angularis), sesbania (Sesbania roxburghii Merr.) or alfalfa (Medicago varia Martin.). The novel strain shared highest 16S rRNA gene sequence similarity to Rhizobium rhizoryzae KCTC 23652(T) and Rhizobium straminoryzae CC-LY845(T) (both 97.5 %) followed by Rhizobium lemnae L6-16(T) (97.3 %), Rhizobium pseudoryzae KCTC 23294(T) (97.1 %), and Rhizobium paknamense NBRC 109338(T) (97.0 %), whereas other Rhizobium species shared <96.7 % similarity. The DNA-DNA relatedness values of strain CC-SKC2(T) with R. rhizoryzae KCTC 23652(T), R. pseudoryzae KCTC 23294(T) and R. paknamense NBRC 109338(T) were 11.4, 17.2 and 17.0 %, respectively (reciprocal values were 11.1, 28.3 and 24.0 %, respectively). Phylogenetic analysis based on 16S rRNA, atpD and recA genes revealed a distinct taxonomic position attained by strain CC-SKC2(T) with respect to other Rhizobium species. The major fatty acids in strain CC-SKC2(T) were C16:0, C19:0 cyclo ω8c, C14:0 3-OH and/or C16:1 iso I and C18:1 ω7c and/or C18:1 ω6c. The polyamine pattern showed predominance of spermidine and moderate amounts of sym-homospermidine. The predominant quinone system was ubiquinone (Q-10) and the DNA G+C content was 60.5 mol%. On the basis of polyphasic taxonomic evidence presented here, strain CC-SKC2(T) is proposed to represent a novel species within the genus Rhizobium, for which the name Rhizobium capsici sp. nov. is proposed. The type strain is CC-SKC2(T) (=BCRC 80699(T) = JCM 19535(T)).
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