Mechanism and Inheritance of Resistance to Rice Tungro Disease in Rice Varieties Basmati 370 and IR 50

Author

Hiroshi NEMOTO¹⁾, Hashim HABIBUDDIN²⁾

1) Tropical Agriculture Research Center 2) Malaysian Agricultural Research and Development Institute

 Released 2010/03/19  

Abstract

Mechanism and inheritance of resistance to rice tungro disease in the rice varieties Basmati 370 and IR 50 were studied. Resistance of Basmati 370 was associated with its resistance to rice tungro spherical virus (RTSV) infection, which was controlled by a single recessive gene. Individual selection for its resistance to RTSV infection in the F₂of a cross with a susceptible variety was effective in securing resistance in the F₃. The RTSV resistance showed a genetic relation with heading date and grain width. Resistance of IR 50 was associated with its resistance to the green leafhopper (GLH), which was controlled by a single partially dominant gene. Individual selection for GLH resistance in the F₂of a cross with a susceptible variety was ineffective in securing resistance in the F₃. However, line selection in the F₅was effective in securing resistance to GLH and virus infection in the later generations. Resistance to GLH in IR 50 was not related to heading date, culm length, panicle length, grain shape or resistance to the brown planthopper.

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