Xanthomonas bacteria are typically yellow in color, which is reflected in their name. The word "xanthos" is Greek for "yellow." This yellow pigmentation is due to the production of a yellow pigment called xanthomonadin.
While Xanthomonas bacteria are typically yellow, they can appear in other colors, depending on the species and growth conditions. Some species, like Xanthomonas campestris pv. campestris, can produce white colonies.
Here are some examples:
- *Xanthomonas campestris pv. campestris:** Yellow colonies on nutrient agar, but white colonies on TSA (Trypticase Soy Agar).
- Xanthomonas oryzae pv. oryzae: Yellow colonies on nutrient agar, but white colonies on TSA.
- Xanthomonas axonopodis pv. citri: Yellow colonies on nutrient agar, but white colonies on TSA.
Note: The color of Xanthomonas colonies can vary depending on the growth medium, incubation temperature, and other factors.
