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Muhammet Tonguç and Phillip D. Griffiths

Black rot, caused by Xanthomonas campestris pv. campestris (Pam.) Dawson (Xcc), is a major bacterial disease of Brassica oleracea L. vegetables. In this study the related species Brassica carinata Braun (ethiopian mustard), which can be used to generate interspecific crosses with B. oleracea was evaluated for resistance to Xcc. Fifty-four accessions and susceptible control plants were wound inoculated with four isolates of Xcc race 4 at the juvenile stage. Of the 54 accessions tested, A 19182 and A 19183 exhibited no symptoms when inoculated with Xcc for all plants tested, and the accessions including PI 199947, PI 199949 and PI 194256 segregated for resistance to Xcc.

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Muhammet Tonguc* and Phillip D. Griffiths

Powdery mildew is a fungal disease of crucifers, caused by Erysiphe polygoni D.C. and it can be problematic during seed increase in green-houses. Crosses were made between Brassica carinata (Ethiopian mustard) accession (PI 360883) and B. oleracea cultivars `Titleist' and `Cecile' to transfer resistance to powdery mildew to B. oleracea germplasm. It was not possible to obtain interspecific hybrids between Ethiopian mustard and B. oleracea through natural seed set. However, interspecific hybrids and backcross one (BC1) progenies were produced via embryo rescue following sexual crosses. Four interspecific hybrid plants were produced with the aid of embryo rescue from cultured pistils with B. carinata as the maternal parent, and their interspecific origin was confirmed through plant morphology and analysis of RAPD polymorphisms. No interspecific hybrids were obtained when `Titleist' was used as a maternal parent. Interspecific hybrid plants were male sterile and they were used as maternal parents to produce BC1 plants. Twenty one BC1 plants were obtained through natural seed set and embryo rescue, although embryo rescue was not necessary to produce first backcross generation plants. When tested in greenhouse with powdery mildew, all interspecific hybrids and eight of the BC1 plants were resistant to the disease. Crosses are being made to produce BC2 plants with 2n = 18 chromosomes for introgression of the resistance in B. oleracea.

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De-Kun Dong, Jia-Shu Cao, Kai Shi, and Le-Cheng Liu

molecular markers Genetics 132 823 839 Teklewold, A. Becker, H.C. 2005 Heterosis and combining ability in a diallel cross of Ethiopian mustard inbred lines Crop Sci. 45 2629 2635 Wang, D

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Xiao-min Liu, Xin-zhi Zhang, Yi-min Shi, and Dong-qin Tang

karyological studies Caryologia 57 4 405 411 Warwick, S.I. Gugel, R.K. McDonald, T. Falk, K.C. 2006 Genetic variation of Ethiopian mustard ( Brassica carinata A. Braun) germplasm in western Canada Genet. Resources Crop Evol. 53 2 297 312 Wu, J. Lu, L. Zhang, Z

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Enrique I. Sánchez-González, Adriana Gutiérrez-Díez, and Netzahualcóyotl Mayek-Pérez

. Velasco, L. Becker, H.C. 2013 Estimation of outcrossing rate in Ethiopian mustard ( Brassica carinata ) using RAPD markers Intl. J. Plant Breed. 7 7 11 Thangjam, R. 2014 Inter-simple sequence repeat (ISSR) marker analysis in Parkia timoriana (DC.) Merr

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Anna L. Testen, Delphina P. Mamiro, Hosea D. Mtui, Jackson Nahson, Ernest R. Mbega, David M. Francis, and Sally A. Miller

Adeniji, O.T. Aloyce, A. 2014 Participatory identification of agronomic and leaf quality traits in Ethiopian mustard ( Brassica carinata A. Braun) genotypes in Tanzania Agr. Biol. J. N. Am. 5 245 251 Adeniji, O.T. Swai, I. Oluoch, M.O. Tanyongana, R

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Susan L.F. Meyer, Inga A. Zasada, Shannon M. Rupprecht, Mark J. VanGessel, Cerruti R.R. Hooks, Matthew J. Morra, and Kathryne L. Everts

, 2005 ; Hansson et al., 2008 ; Rothlisberger et al., 2012 ; Vaughn et al., 2006 ). Root-knot nematodes ( Meloidogyne sp.) are among the pathogens that can be suppressed by incorporation of mustard seed meals into soil. Application of ethiopian