Agronomic traits of breeding lines resistant to brown planthopper developed through marker-assisted selection and backcross in japonica rice

摘要

This study was carried oat to develop a prnmising japonica rice variety resistant to brown planthopper (Bph) through marker-assisted seleection (MAS) and backeross breeding methods. "Milyang 64" which is known as resistant japonica variety to Bph used as a donor parent and "Milyang 165", the susceptible variety as a recurrent. Twenty three lines derived from "Milyang 165~* 3/Milyang 64" were developed using Sdh-1 marker seleetion during the period of backerosses from BC_1F_1 to BC_3F_2. Developed lines were tested to confirm the grain productivity and other agronomic characteristies as well as exact reaction to Bph. Among the twenty three lines, fifteen lines showed homozygous-resistant reaction, and the remains are sepreyated. Lodging and its related charcteristies here investigated were compared to those of parental materials. Heading date and culm length were most dramatically regressed to those of recurrent parental type but the other characteristies showed scatterred distribution between thedonor and recurrent parents.