Analysis of genetic effects of quality trait in japonica hybrid rice;

The yield of Japonica hybrid rice affected by impurity on the basis of CMS-D1;

Ploidy identification of two-seedlings per seed in F_2 generation of japonica hybrid rice(Oryza sativa L.);

The paper reviewed the history of hybrid japonica rice development in China; analysed the status and the existing problems of of hybrid japonica rice.

The new double cropping second season and single cropping varieties of hybrid japonica rice and conventional japonica rice in the regional trials of Zhejiang Province from 2001 to 2003 were chosen to compare in their major agronomic and economic characters.

Through the background and current status of research of hybrid rice in northern China, the achievements and concerning problems in practice, the authors put forward five respects abvout the techniques in developing hybrid japonica rice in northern China.

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.

Root developing trends and morphological characters in different growth stages were studied with japonica hybrid rice combination and its retainer and restorer and conventional varieties.

The cloned bacterial blight (BB) resistance gene Xa21 was transferred into C418,a major restorer line of japonica hybrid rice in China,using an Agrobacterium-mediated system.