Race-specific host-plant resistance against black rot (Xanthomonas campestris pv. campestris) in alien Brassicas
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Cauliflower, screening, Brassica species, black rot, resistanceIssue
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Black rot disease (Xanthomonas campestris pv. campestris (Pam.) Dowson, Xcc) is one of the most devastating diseases in cauliflower worldwide. Potential reservoirs for black rot resistance in alien Brassicas (A and B genomes) were taken due to the availability of limited resistant germplasm for black rot disease in Brassica oleracea (C genome). Total 26 accessions of Brassica species were screened against Xcc race 1, 4, and 6 during three consecutive years, viz., 2015, 2016, and 2017 under artificial inoculation conditions. One accession of B. carinata, and B. napus, two accessions of B. juncea, and all accessions of B. nigra were highly resistant against Xcc race 1, 4, and 6 except SRB-98 (moderate resistance). On the other hand, cauliflower varieties/lines viz., Pusa Meghna, DC 41-5 and Pusa Sharad were highly susceptible against Xcc races 1, 4, and 6. Based on higher homoeology between the A and C sub-genome, a new resistant source BN-2-1 of B. napus was identified, which will be helpful to develop black rot resistant genetic stock with cauliflower through pre-breeding techniques such as in vitro embryo rescue and or somatic hybridization.Abstract
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Enjalbert, J.N., Zheng, S., Johnson, J.J., Mullen, J.L., Byrne, P.F. and McKay, J.K. Brassicaceae germplasm diversity for agronomic and seed quality traits under drought stress. Ind. Crops. Prod.47:176–85. Gomez, K.A. and Gomez A.A. 1984. Statistical Procedures for Agricultural Research (3rd Edn.), John Wiley and Sons, New York, USA & London, pp. 13. Griffiths, P.D., Marek, L.F. and Robertson, L.D. Identification of crucifer accessions from the NC-7 and NE-9 plant introduction collections that are resistant to black rot Xanthomonas campestris pv. campestris races 1 and 4. HortScience.44: 284-88. Ignatov, A.N., Kuginuki, N.Y., Suprunova, T.P., Pozmogova, G.E., Seitova. 2000. RAPD-markers linked to the locus for resistance to the race 4 pathogen for black rot, Xanthomonas campestris pv. campestris (Pamm.) Dowson in B. rapaL. Genetika.36: 357-60. Lema, M., Cartea, M.E., Sotelo, T., Velasco, P. and Soengas, P. 2012. Discrimination of Xanthomonas campestris pv. campestris races among strains from north western Spain by Brassica spp. genotypes and rep-PCR. European J. Plant Pathol.133: 159-69. Raghavendra, B.T., Singh, D., Yadava, D.K., Mondala, K.K. and Sharma, P. 2013. Virulence analysis and genetic diversity of Xanthomonas campestrispv. campestris causing black rot of crucifers. Arch. Phytopathol. Pfl.46.DOI:10.1080/ 2012.737723. Saha, P., Kalia, P. and Sharma, P. 2012. Evaluation of cauliflower (B. oleracea var. botrytis L.) germplasm for resistance against Xanthomonas campestris pv. campestris (Pam.) Dowson causing black rot. Pusa Agri Sci. 35: -91. Saha, P., Kalia, P., Sharma, M. and Singh, D. New source of black rot disease resistance in Brassica oleracea and genetic analysis of resistance. Euphytica. 207: 35-48. https://doi. org/10.1007/s10681-015-1524-y. Sheng, X., Guiju, W., Guo, Y., Yan, H., Zhao, H., and Liu, F. 2012. A semi-fertile interspecific hybrid of Brassica rapa and B. nigra and the cytogenetic analysis of its progeny. Genet. Res. Crop Evol. 59:73-81. Singh, D., Dhar, S. and Yadav, D.K. 2011. Genetic and pathogenic variability of Indian strains of Xanthomonas campestris pv. campestris causing black rot disease in crucifers. Curr. Microbiol. 63: -60. Singh, D., Rathaur, P. S., and Vicente, J. G. 2016. Characterization, genetic diversity and distribution of Xanthomonas campestrispv. campestris races causing black rot disease in cruciferous crops of India. Plant Pathol.65: 1411–1418. doi: 10.1111/ ppa.12508. Sun, Deling Chunguo Wang, Xiaoli Zhang, Wenlin Zhang, Hanmin Jiang, Xingwei Yao, Lili Liu, Zhenghua Wen, Guobao Niu and Xiaozheng Shan 2019.Draft genome sequence of cauliflower (Brassica oleracea L. var. botrytis) provides new insights into the C genome in Brassica species. Horticulture Research. 6:82. https://doi. org/10.1038/s41438-019-0164-0. Taylor, I.D., Conway, S., Roberts, S.J., Astley, D. and Vicente, I.G. 2002. Sources and origin of resistance to Xanthomonas campestris pv. campestris in Brassica genomes. Phytopath.92: -11. Tonguc, M and Griffiths, P. D. 2004a. Development of black rot resistant interspecific hybrids between Brassica oleracea L. cultivars and Brassica accession A 19182, using embryo rescue. Euphytica.136: 313-18. Tonguc, M and Griffiths P. D. 2004b. Evaluation of Brassica carinata accessions for resistance to black rot (Xanthomonas campestris pv. campestris). HortScience.39: 952-54. Tonu, N. N., Doullah, M. A., Shimizu, M., Karim, M. M., Kawanabe, T., and Fujimoto, R., et al. (2013). Comparison of positions of QTLs conferring resistance to Xanthomonas campestris pv. campestris in Brassica oleracea. Amer. J. Plant Sci.4:11–20. doi: 10.4236/ajps.2013.48A002. Vicente, J.G., Taylor, J.D., Sharpe, A.G., Parkin, I.A.P., Lydiate, D.J. and King, G.J. Inheritance of race-specific resistance to Xanthomonas campestris pv. campestris in Brassica genomes. Phytopath.92: 1134-41.
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