Selection of rice line Y1036 resistant to the green leafhopper and tungro disease

H. Habibuddin, K. Hadzim, O. Othman, T. Imbe and T. Omura

Abstract

A breeding programme was undertaken to diversify the resistance of rice varieties against tungro virus and its green leafhopper (GLH) vector Nephotettix virescens Dist. (Homoptera: Cicadellidae). Rice Pankhari 203 was used as a resistant donor. It was crossed with MR 67 and the F₁ was further crossed with Muda, Initial selections were based on symptorns after inoculation by viruliferous GLH colonies bred on rice variety TNI and/or Pankhari 203. Later selections were based on virus assays using the ELISA technique. Field selections were based on agronomic characters. Y1036 was selected as a line resistant to rice tungro spherical virus (RTSV) and its vector GLH. Yield and other agronomic characters of the line were acceptable. Therefore, Y1036 is recommended for use as a better parent for breeding varieties resislant to RTSV ard the vector. Screening procedure using serological methods and relevant colony GLH is recommended.

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