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Title: ‘Carolina Broadleaf’ mustard green (Brassica juncea L.) resistant to the bacterial leaf blight pathogen Pseudomonas cannabina pv. alisalensis

item Wechter, William - Pat
item Katawczik, Melanie

Submitted to: HortScience
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/23/2015
Publication Date: 8/30/2016
Citation: Wechter, W.P., Katawczik, M.L., Keinath, A.P., Smith, J.P., Farnham, M.W. 2016. ‘Carolina Broadleaf’ mustard green (Brassica juncea L.) resistant to the bacterial leaf blight pathogen Pseudomonas cannabina pv. alisalensis. HortScience. 51(8):1062-1064.

Interpretive Summary: Several bacterial pathogens cause leaf spot or blight diseases on leafy green Brassica crops including mustard, turnip, and collard greens. A relatively new pathogen called Pseudomonas cannabina pv. alisalensis has been causing a particularly damaging blight of leafy greens that has now become a very significant problem in many greens producing areas of the U.S., and economic losses for numerous producers in the southeast have been especially severe. ARS scientists in Charleston, SC, identified a leafy green mustard plant introduction held in the USDA Plant Germplasm System that exhibited some resistance to the Pseudomonas leaf blight, and they were able to use that accession to develop a new, highly resistant mustard variety that produces disease-free leaves suitable for both the fresh and processing markets. The new variety has been named ‘Carolina Broadleaf’ and there is already high demand for seed of this mustard from seed and vegetable producers looking for varieties that can withstand attacks by the leaf blight disease.

Technical Abstract: A leafy-green mustard (Brassica juncea L.) cultivar designated ‘Carolina Broadleaf’ has been released by the Agricultural Research Service of the U.S. Dept. of Agriculture in 2015. This released cultivar is a narrow-based population of leafy-green mustard derived from a U.S. plant introduction (PI) in the USDA National Plant Germplasm System (NPGS). ‘Carolina Broadleaf’ is a highly uniform mustard in a similar class as the popular cultivar ‘Florida Broadleaf’. However, ‘Carolina Broadleaf’ has been selected to exhibit a high level of resistance to a bacterial leaf blight disease caused by Pseudomonas cannabina pv. alisalensis (Pca).