The progresses and problems in developing japonica hybrid rice further to the north and the south were introduced, and the technical strategy of breeding indica-type japonica hybrid rice by way of ″Bridging between indica and japonica″ was proposed for further developing japonica hybrid rice currently.

Using maintainer lines as testers of wide compatibility(WC) proved to be helpful for the development of indica-japonica hybrid rice in three-line system.

According to the agriculture industry standard NY/T593-2002,eleven quality traits of milled rice of 282 indica hybrid rice varieties involved early-season,mid-season and late-season collected from Fujian regional test of cultivars from 2003 to 2005 were analyzed and appraised.

Field experiments were conducted at Jiangxi Agricultural University to study the genotype difference of seed nitrogen content in 412 indica rice,63 japonica rice,and 82 indica hybrid rice varieties.