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Inheritance of Bacterial Blight Resistance in Rice. J. O. Olufowote, Former Research Scholar, International Rice Research Institute, Los Baños, The Philippines, Current address of the senior author: Federal Department of Agricultural Research, Moor Plantation, P.M.B. 5042, Idaban, Nigeria ; Gurdev S. Khush(2) and H. E. Kauffman(3). (2)(3)Plant Breeder, and Plant Pathologist, respectively, International Rice Research Institute, Los Baños, The Philippines. Phytopathology 67:772-775. Accepted for publication 29 November 1976. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-772.

We studied the inheritance and allelic relationships of the genes for resistance to bacterial blight in three rice breeding lines IR1330-3-2, IR944-102, IR1698-241, and in three cultivars, Pelita I/1, Kele, and Chinsurah Boro II. The study of F1, F2, F3, and reciprocal backcross populations of crosses between resistant parents and the susceptible cultivar Taichung Native 1 (TN-1) revealed that resistance in these rices is under monogenic control. The resistance of IR 1330-3-2 and Pelita I/1 is incompletely dominant, whereas that of Kele and Chinsurah Boro II is recessive. The genes that govern resistance in IR944-102 and IR1698-241 show recessive gene action with the method of inoculation used in this study. Evidence from allele tests with known genes for resistance indicates that Xa4 governs resistance in IR1330-3-2 and Pelita I/1, and xa5 in Kele and Chinsurah Boro II. Rice breeding lines IR944-102 and IR1698-241 have the same gene for resistance which is closely linked to Xa4.

Additional keywords: Oryza sativa, Xanthomonas oryzae, allelic relationships.