Allozyme variation among biotypes of the brown planthopperNilaparvata lugens in the Philippines

Abstract

Allozyme variation was studied in three Nilaparvata lugens biotypes infesting specific rice varieties and a biotype infesting a weed grass, Leersia hexandra. Of the 20 enzymes in N. lugens for which activity was noted, 9 were polymorphic. Eleven enzyme loci were monomorphic for the same allele in all biotype populations; the rest were polymorphic for two or more alleles. The mean number of alleles per polymorphic locus was 2.3, while the mean number of alleles per locus was 1.5; heterozygosity ranged from 0.02 to 0.06 (biotype 1 greater than biotype 3 greater than Leersia-infesting biotype greater than biotype 2). Allelic frequency differences were observed in five loci among the four biotypes. However, the coefficient of genetic identity (I) of 0.99+ showed that the four biotype populations were genetically close relatives or merely populations of N. lugens undergoing genetic differentiation.

Advancement in Studies on the Virulent of Brown Plan-thopper

“…。这种差异通常 还可以从昆虫形态学、细胞学、同工酶带谱及内共生 菌种类等方面加以检测与识别 [3][4][5][6][7][8] [9] 在 1979~1980 年间对全国 9 个省 25 个县市地区的褐飞虱进行鉴定，结果发现均 为生物型 1。此外，在这期间内，广东 [10] ，江西 [11] ， 江苏 [12] ，福建 [13] ，湖南长沙 [14] ，湖北武昌 [15] ，浙江衢 州和温州 [16] 等地区也进行了监测，结果与前面一致。 在 1989 年以后全国大部分地区的褐飞虱逐渐演变以 生物型 2 或以生物型 2 为主的混合群体。陶林勇等 [17] 报道海南和浙江的褐飞虱种群自 1989 年以后稳定为 生物型 2，且浙江地区的转变过程迟于南方海南和广…”