不同地理种群灰飞虱生物学特性差异
Biological characteristics of different geographical populations of the small brown planthopper Laodelphax striatellus

为明确灰飞虱生物学特性的地理差异,对沈阳、济宁、郑州、南京和嘉兴5个地理种群灰飞虱的表观形态、发育历期、存活率、成虫寿命及生殖力等生物学特性进行了研究。结果表明,在25 ℃条件下,不同地理种群灰飞虱的雌雄比随纬度降低而增大,沈阳、济宁种群的体长显著长于其它种群个体,雌虫中长翅比率存在明显差异。若虫存活率差异显著,由低到高为:郑州
In order to understand the biological variation among different geographical populations of the small brown planthopper (SBPH, Laodelphax striatellus), we collected five SBPH populations from Shenyang, Jining, Zhengzhou, Nanjing and Jiaxing, respectively. Morphological phenotype, developmental duration, survival rate, adult longevity and reproductive capacity were investigated for all five populations. At 25 ℃, the sex ratio (female/male) increased with decreasing latitude. The average body length of individuals from Shenyang and Jining was longer than that from the other regions. The percentage of long-wing females varied significantly among the five populations. The Nanjing population had the highest nymph survival rate, followed by Jiaxing, Shenyang, Jining, and Zhengzhou populations. The developmental threshold temperature of the SBPH was slightly different from 11 ℃ to 12 ℃ among different populations. However, longer nymph duration and higher effective accumulated temperature were observed in both Shenyang and Jining populations. Along with the temperature increase, the adult longevity of all five populations became shorter, but differentiated at different temperatures. There was a significant difference in effective fecundity among different populations, in a low-to-high order: Jiaxing, Zhengzhou, Jining, Shenyang, Nanjing.