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Characterization of a Putative Rice Mutant for Reaction to Rice Tungro Disease

International Rice Research Institute (IRRI), Plant Breeding, Genetics, and Biotechnology Division, DAPO Box 7777, Metro Manila, Philippines

^* Corresponding author (ichoi{at}cgiar.org).

Artificial mutations may induce traits that are scarce among natural germplasm sources. This study was conducted to characterize a rice line derived from variety IR64 showing resistance to rice tungro disease (RTD). Approximately 24,000 lines derived from IR64 seeds treated with mutagens were evaluated for reaction to RTD. One of the lines, M4D6 83-1 (MD83), showed enhanced resistance to RTD. MD83 was resistant to rice tungro spherical virus (RTSV) and the virus vector, green leafhopper (GLH; Nephotettix virescens Distant). MD83 was crossed with susceptible varieties IR64 and Taichung Native 1. All F₁ plants were susceptible to RTSV, whereas F₂ and F₃ progenies segregated into resistant and susceptible phenotypes in a 1:3 ratio, indicating that the resistance is controlled by a single recessive locus. Most of the F₃ lines resistant to RTSV were also GLH resistant, suggesting that the resistance to RTSV and GLH was governed by the same locus. It has been difficult to prove whether the genotype MD83 was a product of a mutation event or was represented in the variety IR64 at a very low frequency.

Abbreviations: DAI, days after inoculation • ELISA, enzyme-linked immunosorbent assay • GLH, green leafhopper • RTBV, rice tungro bacilliform virus • RTD, rice tungro disease • RTSV, rice tungro spherical virus • SSR, simple sequence repeat • TN1, Taichung Native 1

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Received for publication March 6, 2007.