小粒野生稻对褐稻虱抗性机制的研究

 通过应用改良苗期群体筛选法，对小粒野生稻进行了抗性鉴定，并根据褐稻虱在抗性品种上的生存率、发育进度、蜜露分泌量、群体建立、虫体重量变化、卵巢发育程度、产卵量和稻株的受害级别等指标与感虫对照品种TN1上的差异显著性作比较，综合评定了小粒野生稻对褐稻虱的抗性机制。试验结果表明，小粒野生稻对褐稻虱的抗性级别为0级，属高抗褐稻虱。在小粒野生稻上，褐稻虱的生存率为18％，蜜露分泌量为6.04 mm2，群体建立为21.8头/对，体重增量为-0.33 mg，卵巢发育为2.9级，产卵量为29.67粒/雌;而在感虫对照品种TN1上，褐稻虱的生存率为82％，蜜露分泌量为46.8 mm2，群体建立为217.0头/对，体重增量为2.27 mg，卵巢发育为4.8级，产卵量为229.3粒/雌。由此可知，小粒野生稻对褐稻虱的抗性机制为抗生性和非选择性。

Resistance Mechanism of Oryza minuta to Nilaparvata lugens

The resistance of Oryza minuta to the brown planthopper (BPH),Nilaparvata lugens (stal) 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 mm2,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 mm2,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.