Dominance Reversal of a Bacterial Blight Resistance Gene in Some Rice Cultivars

Publisher Website
Google Scholar
Abstract
The inheritance of resistance to Xanthomonas oryzae isolate PXO61 (from the Philippines) in 5 rice cultivars [Oryza sativa ''Dayaggot Qan Binuggon'', ''Malagkit Sungsong'', ''Nagkayat'', ''Pinidwa Qan Qipugo Qelek'' and ''Zenith''] was studied. The same gene confers resistance in the 5 cultivars. The pattern of segregation indicates a monogenic recessive factor when the plants are inoculated at the booting stage, but it is monogenic dominant when the plants are inoculated during flowering. The dosage effect of the resistance gene causes this reversal of dominance because the heterozygous plants are susceptible at booting and resistant during flowering. This gene, designated Xa6, is linked to Xa4, another dominant gene for resistance, with a crossover value of 26%.

This publication has 0 references indexed in Scilit: