关键词: 褐飞虱, 水稻品种, 植物抗性, 根系, 植株功能损失指数, 营养元素吸收

Abstract: To understand the relationship between rice plant resistance and the uptake of nitrogen, phosphorus and potassium by roots under Nilaparvata lugens infestation, we examined the rice plant resistance （average injury scale）, functional plant loss index (FPLI) and uptake of nitrogen, phosphorus and potassium by roots of rice varieties under N. lugens infestation. The results showed that the FPLI of TN1 was the greatest, followed by Xieyou 63 and super-high yield rice Peiai 64S/E32, and that of Xieyou 963 was the lowest （0.661） under the infestation of 30 nymphs per plantThe percent reduction of K uptake in hydroponic solution under the infestation of 40, 60 and 80 nymphs per plant was the highest, followed by P and the last was N. The uptake of N, P and K by roots significantly declined with the increase of N. lugens feeding duration （6 and 9 d）. Percent reduction of K uptake by roots after infestation by 60 nymphs was 164.11% on TN1, 74.61% on Xieyou 63, 55.16% on Xieyou 963 and 46.60% on super-high yield rice Peiai 64S/E32, respectively. It is so concluded that the level of uptake by roots decreased dramatically with the rice plant resistance decreasing. The present findings may have significance for understanding the relationship between rice resistant level and uptake levels of rice roots.

Key words: Nilapavata lugens')">