光照强度和氮肥对水稻品种抗褐稻虱的影响

本文对12个水稻品种的抗虫性质及其受环境条件的影响进行了研究,结果表明,9个抗级品种有较强的抗生性和非嗜好性,表现于飞虱栖息数量少、生存率低、发育缓慢、分泌蜜露量少和刺探频率高。中抗品种辐包矮21和包选2虽然耐害性很强,但前者的抗生性较后者的稍强,且对取食存有非嗜好性。不同品种的非嗜好性受光照强度的影响程度有显著差异。光照强度减弱和偏施氮肥都会加速水稻植株的死亡,引起抗性减弱甚至消失。但光照强度和拖氮水平对不同品种的抗性表现及植株死亡速度的影响程度并不完全一样,存在着互作效应。

INFLUENCE OF LIGHT INTENSITY AND NITROGEN FERTILIZER ON RESISTANCE TO THE BROWN PLANTHOPPER IN RICE

The nature of resistance to the brown planthopper (BPH),Niloparvata lugens(Stal) was studied in 12 rice varieties.The results indicated that 9 highly resistant varieties exhibited strong nonpreference and antibiosis,as demonstrated by the fact that the insects caged on the tested varieties had few numbers for shelter,high mortality,slow development,less honeydew excreted,and more feeding marks on the leaf sheath.In two moderately resistant varieties,'Fubaoai 21' exhibited certain degree of antibiosis and nonpreference,whereas 'Baoxuan 2' had only weak antibiosis.Some effects of environment conditions on resistance in the Sth leaf-stage rice seedlings were also studied.The results showed that the resistance was influenced by the light intensity and nitrogen fertilizer.Generally,the resistance was reduced and the dead speed of seedlings was accelerated with the decrease of light intensity and the increase of nitrogen fertilizer.A mutual cross-reaction relationship between light intensity and nitrogen fertilizer for resistance was demonstrated.The expression of nonpreference affected by light intensity exhibited different levels in various varieties.