Correlation principal component and cluster analyses were performed to test sixteen grain quality traits(including rapid viscosity analyzer value) of nineteen rice cultivars introduced from abroad.

Resistance to small brown planthopper and its mechanism in rice varieties;

Changes in levels of nitrogen, phosphorus and potassium in roots and shoots of different rice varieties under infestation by Nilaparvata lugens (Stl) (Homoptera: Delphacidae);

Influence of rice varieties on the metabolizing enzymes of Nilaparvata lugens Stl;

Effect of rice variety and fertilization timing on egg parasitism of Sogatella furcifera in the single-cropping season rice field;

To compare photosynthetic performances within rice canopies of different rice varieties,intersubspeicific hybrid Peiai64S/E32,Peiai64S/9311,X07S/Zihui100,three-line hybrid Gangyou881,inter-varietal hybrid Shanyou 63 and japonica rice variety 9516 were used as materials.

The results showed that after rice plants were infested by WBPH, photosynthesis rate and chlorophyll contents in leaves of susceptible rice varieties (TN1 and Shanyou 63) declined obviously compared to those of resistant rice variety (N22); activity of superoxide dismutase (SOD) increased and of catalase(CAT) and peroxidase (POD) decreased in susceptible rice varieties, but activity.

Pathotype diversity of Magnaporthe grisea and resistance of rice cultivars to the pathogen in Jiangsu Province;

Interrelationship between race evolution of Magnaporthe grisea and rice cultivars in Jiangsu Province;

Different biological characters of rice lead to differences in methane emission of rice cultivars from rice paddy field.

The paper summarized the supply of phosphate resources in soil at home and abroad;also the progress on following aspects: Low-phosphorus stress tolerent characteristics of rice cultivars;Screening and identification low-phosphorus stress tolerence of rice cultivars;Effect of phosphor.

According to the relevancy and sequencing on the resistance of different rice cultivars,the result showed that the drought resistance of Yangdao6 was stranger than that of other cultivars,and Xieyou63 s followed,but the drought resistance of Xiguang and Anxuan5 was weaker relatively.

In order to utilize the resource of the rice in Heilongjiang province resisting against the rice blast, used inference of disease spots reactive, we classified some japonica rice cultivars of Heilongjiang province according to the resistance to the blast using 7 stable pathogenicity Japanese strains.