Xanthomonas nasturtii
Species of bacteria
From Wikipedia, the free encyclopedia
Xanthomonas nasturii a gram-negative, obligate aerobic bacterium that like many other Xanthomonas spp. bacteria has been found associated with plants, in particular watercress (Nasturtium officinale). It causes black rot of watercress.
| Xanthomonas nasturtii | |
|---|---|
| |
| Xanthomonas nasturii symptoms on watercress | |
Scientific classification  | |
| Domain: | Bacteria |
| Kingdom: | Pseudomonadati |
| Phylum: | Pseudomonadota |
| Class: | Gammaproteobacteria |
| Order: | Lysobacterales |
| Family: | Lysobacteraceae |
| Genus: | Xanthomonas |
| Species: | X. nasturtii |
| Binomial name | |
| Xanthomonas nasturtii Vincente, 2017 | |
Hosts and symptoms
Symptoms include small yellow or dark leaf lesions around the hydathodes, V -shaped leaf lesions, wilt, distortion of plants and early senescence. Initially the symptoms were attributed to Xanthomonas campestris due to the similarity of symptoms with black rot of brassicas.[1]
Distribution and economic importance
Watercress is a relatively small crop worldwide, but economically significant for some particular regions of the globe. Black rot of watercress can lower the quality of the watercress and possibly limit yields.[2][3] It was reported that infections can lead to up to 60% yield reduction and rejection of crops.[3]
The disease has been found in samples from the US, Florida[2] and Hawaii.[3] The disease has been regularly observed in Hawaii production in all islands, mostly during the rainy season from December to April in areas with poor air circulation.[4]
This disease has also been found in Europe, in Spain and Portugal.[5] It is likely that the disease can be seed transmitted as it has been detected in a seed sample from Spain.[5]
Control
Like for other bacterial diseases, control might involve the use of copper bactericides. It is advised to minimize moisture on leaves by reducing overhead irrigation and increasing air circulation.[4]