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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

View larger version (17K): [in this window] [in a new window]   Figure 1. Temporal changes in rice tungro spherical virus (RTSV) infection rate (%) in MD83, IR64, and Taichung Native 1 (TN1) by the forced-tube inoculation method. Vertical lines indicate the standard error for RTSV infection rates at the respective time points. Means and standard errors were based on four replicated experiments.

View larger version (20K): [in this window] [in a new window]   Figure 2. Temporal changes in rice tungro bacilliform virus (RTBV) infection rate (%) in MD83, IR64, and Taichung Native 1 (TN1) by (A) agroinoculation and (B) insect transmission methods. Vertical lines indicate the standard error for RTBV infection rates at the respective time points. Means and standard errors were based on four replicated experiments.

View larger version (112K): [in this window] [in a new window]   Figure 3. Reactions of a highly susceptible mutant (M4D6 245-9-4-2), resistant mutant (MD83), and IR64 to simultaneous infection with rice tungro spherical virus (RTSV) and rice tungro bacilliform virus (RTBV) by the insect transmission method. Plants were confirmed infected with both RTSV and RTBV by enzyme-linked immunosorbent assay (ELISA).

View larger version (21K): [in this window] [in a new window]   Figure 4. Temporal changes in the numbers of green leafhopper (GLH) alighted on Taichung Native 1 (TN1), IR64, MD83, and IR62 during the host choice test. Vertical lines indicate the standard error for the numbers of GLH per plant among 20 plants at the respective time points. Means and standard errors were based on four replicated experiments.

View larger version (37K): [in this window] [in a new window]   Figure 5. (A) Percentages of F3 lines derived from Taichung Native 1 (TN1)/MD83 that showed resistance to rice tungro spherical virus (RTSV) (horizontal stripes), RTSV and green leafhopper (GLH) (checkered lines), and GLH (vertical stripes). (B) Percentages of F3 lines derived from IR64/MD83 that showed resistance to rice tungro spherical virus (RTSV) (horizontal stripes), RTSV and GLH (checkered lines), and GLH (horizontal stripes).

View larger version (10K): [in this window] [in a new window]   Figure 6. Phylogenetic tree showing relatedness between eight rice varieties and mutant line MD83. The similarity matrix was generated according to the coefficient obtained through the unweighted pair group method with arithmetic mean (UPGMA) function of NTSYS-pc software.