褐稻虱饲料稻株中数种氨基酸的营养效应

本研究初步证实饲料稻株中甘氨酸、赖氨酸和酪氨酸含量的高低,同褐稻虱(Nilaparvata lugens Stal)的发育进度、存活率、短翅型出现率和单雌产卵量关系极为密切,它们是褐稻虱赖以正常生长发育和繁殖的重要氨基酸。

THE NUTRITIVE EFFECT OF SOME AMINO ACIDS IN RICE PLANTS ON THE BROWN PLANTHOPPER, NILAPARVATA LUGENS (STAL)

1. The developing nymphs of brown planthopper Nilaparvata lugens (Stal) require from their host plants amino acids including tyrosine, glycine and lysine. Laboratory experiments have been carried out to demonstrate that the young nymphs, especially of the first and second instars, can develop rapidly in the presence of sufficient amounts of free tyrosine, glycine and lysine in their host plants. The requirements fall in the order: tyrosine>glycine>lysine. The concentrations of free tyrosine and lysine have conspicuous growth-promoting effect. Higher concentration of free tyrosine will bring forth a high percentage of brachypterous males but a low percentage of brachypterous females with high fecundity. The concentrations of free glycine and lysine in the rice plants are negatively correlated to the nymphal survival rate.2. Experimental result of rice water-culturing has shown that the free amino acids in the rice plants can influence the ratio of survival and development of the nymphs, the ratio of wing-forms in both sexes and the fecundity of brachypterous females. The importance of free tyrosine, glycine and lysine has been demonstrated.3. The levels of free glycine, lysine and tyrosine in the plant sap can be changed by adding these amino acids into the culttiring water for the rice plants and the influence of temperature on this effect has been noted.