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Horticulture Research 9,
Article number: uhac082 (2022)
doi: https://doi.org/10.1093/hr/uhac082
Views: 444
Received: 06 Feb 2022
Accepted: 21 Mar 2022
Published online: 11 Apr 2022
Dear Editor,
Citrus (Citrus L.) is one of the most important fruit crops in the world. Sweet oranges (C. × sinensis), grapefruit (C. × paradisi), pummelos (Citrus maxima), lemons (C. × limon), limes (Citrus aurantifolia), mandarins (Citrus reticulata), and tangerines (Citrus reticulata) are the major cultivated types of Citrus. Production worldwide faces challenges from devastating bacterial diseases, including citrus canker, citrus greening (Huanglongbing, HLB), and citrus variegated chlorosis [2]. Citrus canker is caused by Xanthomonas citri ssp. citri (Xcc); most citrus species and cultivars are susceptible to citrus canker. Improving resistance to citrus canker has been an important citrus breeding objective. Recent studies have shown that disabling disease susceptibility genes including the DOWNY MILDEW RESISTANCE 6 (DMR6) gene can be a promising approach to engineering resistance to diseases [1, 3, 5, 6].