Survival of Xanthomonas campestris pv. campestris in the phyllosphere and rhizosphere of weeds

Abstract

The phyllosphere and rhizosphere of weeds are important niches for phytobacterial survival. The absence of information in Brazil regarding Xanthomonas campestris pv. campestris (Xcc), the causal agent of black rot in crucifers, motivated this study. Twenty-six weed species belonging to 14 botanical families were included in field experiments between August 2014 and October 2015. Lepidium virginicum and Raphanus raphanistrum (Brassicaceae) demonstrated great potential for survival of Xcc in the phyllosphere, with the bacterium isolated after 56 and 70 days, respectively. Low variation between maximum and minimum temperatures, high rainfall and high relative humidity at specific times of the year contributed to longer Xcc survival periods in the phyllosphere of some species. Xcc survived in the rhizosphere only in R. raphanistrum, where it was isolated for up to 28 days. No relation was found between climatic factors and survival in the rhizosphere. The data indicate that control of brassicaceous weeds will contribute to the control of black rot.

Weeds as alternate hosts of Xanthomonas euvesicatoria pv. euvesicatoria and X. campestris pv. campestris in vegetable-growing fields in the state of Pernambuco, Brazil

“…X. campestris pv. campestris can also epiphytically survive in L. virginicum and Raphanus raphanistrum (Silva et al 2017).…”

Colonization of siliques and seeds of rapid cycling Brassica oleracea plants by Xanthomonas campestris pv. campestris after spray-inoculation of flower clusters

“…The blackening of the pointed beaks of siliques (c) was also found on mock-inoculated flowers. In (d) siliques without symptoms on mock-inoculated plants are shown (Silva et al 2017), alternative host plants, including weeds (Krauthausen et al 2018), and in crop debris on soil (Köhl et al 2011). In particular, pollinating insects may play a role in the occurrence of flower infections.…”

Genome Sequences of Two Pathogens of Cruciferous Crops, Xanthomonas campestris pv. raphani MAFF 106181 and X. campestris pv. campestris MAFF 301176

“…armoraciae) is the pathogen responsible for bacterial spot of crucifers ( 1 – 3 ), and X. campestris pv. campestris is responsible for black rot of crucifers ( 4 – 6 ). Both pathogens have the potential to pose a global threat to the production of cruciferous (Brassicaceae) crops such as cabbage, broccoli, and Japanese radish.…”