In comparison, the promotion of leaf respiration by nitrogen application of Ratna, a non aromatic rice, was significantly larger tnan that of HKR228, an aromatic rice variety.

In this paper we determined rice RVA profile characteristics of 42 aromatic rice germplasms introduced from home and abroad,and studied the relationship among RVA profile characteristics and between amylose contents(AC).

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.

A total of 20 accessions of Japonica cultivars were treated under 25,30,35 and 40 cent degree for continuing 2,4,6,and 8 days respectively.

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.