Resistance Mechanism of Oryza minuta to Nilaparvata lugens

The resistance of Oryza minuta to the brown planthopper(BPH), Nilaparvata lugens (stl) was analyzed by applying Modified Seedbox Screening Technique(MSST). Based on the significant differences between Oryza minuta and TN1, the susceptible check variety, in a series of resistance indices such as survival, honeydew amount, population establishment, body weight, ovary development, the number of eggs laid and damaged scale of rice, etc., the resistance mechanism of Oryza minuta to BPH was synthetically evaluated. The results were as follows: The resistant score of Oryza minuta to BPH is zero, it was a high degree of resistance. On Oryza minuta, the survival rate of BPH was 18%, the honeydew amount was 6.04 mm 2, the number of population establishment was 21.8 per female, the body weight increased was -0.33 mg, the ovary development was 2.9 grade, the average number of eggs laid was 29.67, but on TN1, the survival rate of BPH was 82%, the honeydew amount was 46.8 mm 2, the number of population establishment was 217.0 per female, the body weight increased was 2.27 mg, the ovary development was 4.8 grade, the average number of eggs laid was 229.3, the divergence between them were significant. It was confirmed that the resistance mechanism of Oryza minuta to BPH was antibiotic and nonperference.