Short Communication
Segregation Ratios of Tungro Virus Resistance on F2 Progenies Derived from Utri Merah and ARC12596

Ema Komalasari, Fitri Widiantini, Santika Sari and Nono Carsono

Asian Journal of Crop Science, 2020, 12(2), 124-129.


Background and Objective: Rice tungro disease remains as one of the major threat to rice production in Indonesia and other countries. One of the proven methods in preventing the occurrence of tungro virus is through the use of resistant varieties. The development of resistance of glutinous rice (Oryza sativa glutinosa) to tungro virus is expected to be achieved through hybridization between glutinous rice with tungro resistance rice. The aim of this study was to estimate number of gene controlling tungro resistance and obtain rice progenies that resistant to the virus. Materials and Methods: Around 230 F2 progenies of Ketonggo×Utri Merah as well as Ketonggo× ARC12596 were evaluated. Forced-tube inoculation method was used to inoculate tungro disease and standard evaluation system for rice from IRRI was applied to assess the tungro infection symptoms. Scoring was performed at 2, 4 and 10 weeks after inoculation (wai). Results: The distinguished progenies with recovery abilities and stable have been obtained. The inheritance of tungro resistance was supposed to be controlled by recessive genes with different patterns, for Ketonggo×Utri Merah was susceptible 3: 1 resistant (complete dominance) and susceptible 9: 7 resistant (duplicate recessive epistasis) for Ketonggo×ARC12596. Conclusion: Recessive genes are supposed to control the tungro virus resistance but the inheritance pattern on both crosses is slightly different, indicating donor parents have dissimilar resistant genes.

ASCI-ID: 4-271

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