氮营养对褐飞虱在IR64稻株上取食和产卵行为的影响

研究了褐飞虱对不同含氮量的IR64稻株的取食和产卵选择性、寄主含氮量对褐飞虱种群选择性的影响以及在不同含氮量稻株上取食和产卵的空间分布.结果表明,无论褐飞虱饲养在高氮和低氮稻株上其雌成虫均显著偏爱在含氮量高的稻株上取食和产卵,而若虫对不同含氮量稻株的取食选择性无显著差异.随着稻株含氮量的下降褐飞虱取食和产卵的位置从叶鞘底部逐渐向上部转移,直至叶片中脉.在低氮稻株上若虫和成虫均偏向于较高的位置取食和产卵,而且不同的种群有明显差异.饲养在低氮稻株上的褐飞虱种群在低氮稻株上的取食频次最高,褐飞虱种群的取食频率与其前期饲养的寄主有关.

Effects of nitrogen nutrient on the behavior of feeding and oviposition of the brown planthopper, Nilarpavata lugens, on IR64

We determined the preferences of feeding and oviposition of the brown planthopper (BPH), Nilaparvata lugens, to rice plants of IR64 with different nitrogen content, the changes in preferences of BPH populations fed successively on plants with high (200N) or low (0N) nitrogen fertilizer, and the influences of nitrogen content on the spatial distribution patterns of feeding and oviposition. In choice test, all females from four populations reared on both 200N and 0N rice plants preferred significantly to feed and oviposite on plants with high nitrogen content, while no marked difference in nymph feeding preference was found among the rice plants. The positions of feeding and oviposition were shifted gradually from the bottom to upper of leaf sheath, and then to leaf blade with the reduction of nitrogen content in host plants. Both nymphs and adults located at higher position of plants and fed much more frequently on 0N rice plants than that on 200N rice plants, and differed markedly among BPH populations. The highest feeding frequency was found in the nymphs, which reared successively on 0N rice plants, on 0N rice plants, implying that feeding frequencies of BPH populations were related closely to their previous host plants.