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水稻和茭白是二化螟的两种主要寄主植物。经过长期的适应进化,二化螟已分化出水稻种群和茭白种群。国内外的大量研究表明,二化螟水稻种群和茭白种群在形态特征、交配行为、寄主选择性、寄主适应性、田间种群动态、越冬生物学、生理生化及遗传多样性等方面均存在一定差异。二化螟水稻种群和茭白种群的发生期差异、交配节律差异和交配后配子不亲合等可能造成了寄主种群的部分生殖隔离。目前认为,二化螟两寄主种群间仍存在基因交流,处于物种形成的早期阶段,但尚需从寄主种群鉴定、表型差异区分和种群间生殖隔离机制等方面开展深入研究来进一步明确,为理解昆虫同域物种形成机制提供参考。
Rice and white rice are the two main host plants for Sesamia inferens. After long-term adaptive evolution, the stem borer has been divided into rice and white poplar population. Numerous studies at home and abroad show that there is a certain difference in the morphological characteristics, mating behavior, host selectivity, host adaptability, field population dynamics, overwintering biology, physiology, biochemistry and genetic diversity among rice stem borer . The differences in the occurrence period between the rice stem borer (Chilo suppressalis) populations and the Chilo suppressalis population, differences in mating rhythm and incompatibility of the gametes after mating may result in partial reproductive isolation of the host population. At present, it is believed that there is still gene exchange between two host populations of Chilo suppressalis, which is in the early stage of species formation. However, in-depth study on host population identification, phenotypic difference differentiation and inter-population reproductive isolation mechanism is needed to further clarify Provide a reference for understanding the formation mechanism of insect homology species.