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Title: In field resistance to Asiatic citrus canker of Citrus spp. genotypes

item NUNES, WILLIAM - University Of Maringa
item CARVALHO, SERGIO - Agronomical Institute Of Campinas (IAC)
item BELASQUE, J - Universidad De Sao Paulo
item GONZALVES-ZUILANI, ALINE - University Of Maringa
item MACHADO, MARCOS - Agronomical Institute Of Campinas (IAC)
item CROCE-FILHO, JOSE - Universidade Federal Do Parana
item Abdo, Zaid
item Bock, Clive

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 5/9/2014
Publication Date: 11/1/2018
Citation: Nunes, W.M., Carvalho, S.A., Belasque, J., Gonzalves-Zuilani, A.M., Machado, M.A., Croce-Filho, J., Abdo, Z., Bock, C.H. 2018. In field resistance to Asiatic citrus canker of Citrus spp. genotypes [abstract]. Phytopathology. 104:S3.86.

Interpretive Summary:

Technical Abstract: Asiatic citrus canker (ACC), caused by Xanthomonas citri ssp. citri causes yield loss and renders fruit unfit for the fresh market. A 6-year study in Paraná state Brazil was conducted to compare the susceptibility of 186 genotypes of Citrus representing 9 species (C. aurantifolia, C. aurantium, C. clementina, C. deliciosa, C. limon, C. paradisi, C. reticulata, C. sinensis, and C. unshui, and) and 4 hybrids (C. reticulata x C. sp, C. reticulata x C. paradisi, C. reticulata x C. sinensis, and C. unshui x C. sinensis). The number of lesions per leaf was assessed eighteen times from 2005 to 2010 (=4 times per year). Mixed model analysis of fixed and random effects showed six resistance-susceptibility groupings of species and hybrids. The most resistant species grouping included C. unshui and C. limon (mean lesions per leaf of 4.32 and 4.26, respectively), and the most susceptible species were C. paradisi and C. aurantifolia, with 14.84 and 10.96 lesions per leaf, respectively. Other species (C. reticulata, C. aurantium, C. deliciosa, and C. sinensis) had intermediate severity (5.48 to 9.56 lesions per leaf). Hybrids had a range of ACC severity, and were in the more resistant groupings (5.26 to 7.35 lesions per leaf). These results of the relative susceptibility of different citrus genotypes can be used in future research, and to assist in varietal selection or for breeding purposes both within Brazil and other locations where ACC is an issue.