Abstract
Maize bacterial leaf streak disease has spread across maize crops in South Africa and therefore potentially poses a threat to maize production and food security. Until recently, this pathogen was identified as a Xanthomonas campestris pathovar, whereas our South African genomes seem to be more divergent and create their own subclade.
Highlights
Maize bacterial leaf streak disease has spread across maize crops in South Africa and potentially poses a threat to maize production and food security
Maize leaves displaying characteristic longitudinal streak symptoms were collected from warm dry maize production regions of South Africa from nonirrigated maize fields
A 16S rRNA gene neighbor-joining (NJ) tree for 47 of our samples and some Xanthomonas sp. reference fragments from GenBank was drawn in MEGA7 [5]
Summary
Maize bacterial leaf streak disease has spread across maize crops in South Africa and potentially poses a threat to maize production and food security. Maize leaves displaying characteristic longitudinal streak symptoms were collected from warm dry maize production regions of South Africa (mainly North West, Free State, Northern Cape, and Gauteng provinces) from nonirrigated maize fields. Initial bacterial identification was conducted using PCR with the universal ribosomal gene (16S rRNA gene) primers 27F and 1492R. A 16S rRNA gene neighbor-joining (NJ) tree (default settings with maximum composite likelihood model and bootstrap calculation of 1,000 repeats) for 47 of our samples and some Xanthomonas sp. Reference fragments from GenBank was drawn in MEGA7 [5].
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