Development of Whole Chromosome Substitution Lines under TNG71 with Japonica Background

    The development of whole indica chromosome substitution lines under TNG71 with japonica background that will be helpful on some parts included (1) introgressing indica elite genes into Taiwanese cultivars, (2) evaluating the pyramiding effect on and gene-environment interaction in target traits, and (3) introducing marker-assisted selection (MAS) into rice breeding.

Background recovery ratio of whole chromosome substitution lines (WCSL) in each backcross generation

Morphological performance of TNG71 WCSL and two parents

Establishment of MAS platform with a high grain number to increase yield potential

    Novel rice cultivar improvement with high yield potential was made through marker-assisted backcross selection that introduced high grain number gene form Habataki into Tainung 71 within 3 years. The grain number per panicle of TNG71-Gn1 would be increased 26% from 105.2 to 132.5 and grain yield could increase 4.2% to 5,536 kg/ha in the second crop season.

Plant, panicle type, and genotype of novel line TNG71-Gn1

Grain number distribution of TNG71-Gn1 and two parents