The newDian-type japonica hybrid rice combination Dianza 33 is derivedfroma DianI type male sterile lineYumi 15Aand a newly developed elite restorer line Diannong R-3 .

From 1993 to 1996, 806 rice germplasms of Dian-type japonica hybrid rice were tested for rice blast resistance with seven dominant physiological strains of Pyricularia grisea (A 1,B 13 ,C 13 ,D 1,E 1,F 1,G 1) in Yunnan Province.

Two combines are all belong to Dian I type Japonic Rice.

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.

The relationship between the indica japonica differentiation of parents and heterosis of hybrid rice was studied with 10 sterile lines, 10 maintainer lines, and 38 restorer lines of Dian type hybrid rice and 40 hybrids derived from the sterile lines and restorer lines.

The indica japonica differentiation characteristic of CMS lines and restorer lines of Dian type hybrid rice was studied with 19 indica japonica diagnostic random primers.

Analysis of heterosis in two-line Japonica hybrid rice under different environments;