Acta Entomologica Sinica (2004) 47, 73-79

Chun-Xuan Li, En-Bo Ma, Xian-Yun Zheng and Ya-Ping Guo (2004)
Genetic structure of four geographic populations of Locusta migratoria manilensis in China
Acta Entomologica Sinica 47 (1), 73-79
Abstract: The genetic structure of the four geographic populations of the Oriental migratory locust Locusta migratoria manilensis was analyzed using horizontal starch gel electrophoresis: Among 20 loci of 13 isozymes identified, the higher the percentage of polymorphic loci ( P = 70% - 80%) , the lower the observed overall heterozygosity (H₀ = 0.023 - 0.032). The result from Chi-square test for the genotype frequencies showed the genotype frequency at most loci deviated significantly from Hardy-Weinberg equilibrium except Adk-1, Gdh-1, G3 pd-1 and Pgm-1. Based on F-statistics (average F_st = 0.0606), an extremely small genetic differentiation among the four populations was observed. It appeared that the long-distance migration of the locust enhanced gene flow and decreased genetic differentiation. The divergence among four populations was revealed using Nei' s genetic identity (I) and Roger's genetic distance (D) . The higher the genetic identity, the smaller the genetic distance observed between Shanxi-Linyi and Shanxi-Yongji populations (I = 0.964 , D = 0.175), and between Jiangsu-Peixian and Henan-Zhongmou populations (I = 0.957, D = 0.160) . The results indicated that there was a positive relationship between genetic differentiation and geographic distance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): En-Bo Ma

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Locusta migratoria		China (NE)