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Sweet basil ( Ocimum basilicum  L.) downy mildew disease (DM) caused by  Peronospora belbahrii  is a worldwide threat to the basil industry due to the lack of natural genetic resistance in sweet basil germplasm collections. In this study, we used CRISPR-gene editing to modify the sweet basil DM susceptibility gene  homoserine kinase  ( ObHSK ). Gene-edited plants challenged with  P. belbahrii  displayed a significantly reduced susceptibility to DM, based on phenotypic disease indices and on  in planta  pathogen load. These results suggest that  ObHSK  plays a role in conditioning DM susceptibility, similar to that observed for the  AtHSK  gene in Arabidopsis. These results demonstrate the utility of CRISPR-gene editing in enhancing DM resistance and contributing to sweet basil breeding programs.

CRISPR-Editing of Sweet Basil (Ocimum basilicum L.) Homoserine Kinase Gene for Improved Downy Mildew Disease Resistance