Environmental and Genetic Factors Determine Whether the Mosquito Aedes aegypti Lays Eggs without a Blood Meal
Environmental and Genetic Factors Determine Whether the Mosquito Aedes aegypti Lays Eggs without a Blood Meal
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DOI：
10.4269/ajtmh.14-0471
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发表时间：
2015-04-01
影响因子：
3.3
通讯作者：
Jiggins, Francis M.
中科院分区：
文献类型：
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作者：
Ariani, Cristina V.;Smith, Sophia C. L.;Jiggins, Francis M.
一些蚊子品系或种类能够在不吸血的情况下产卵，这种特性被称为自生。这可能使种群能够在脊椎动物宿主稀缺的时间或地方存活下来。在某些物种中，自生卵高度依赖于环境，但其在埃及伊蚊中表达的理想条件尚不清楚。我们发现在伊蚊种群中有3.2%的雌性。来自肯尼亚的埃及伊蚊是自生的。自生受温度的强烈影响，在28℃下产卵比在22℃下产卵更多。幼虫期营养良好，成虫期食用浓度较高的糖溶液，都能产生更多的自生卵。这一特征也有遗传基础，并不是所有的Ae。埃及伊蚊基因型可以自生产卵。我们得出结论，Ae。埃及伊蚊需要有利的环境和合适的基因型才能在不吸血的情况下产卵。
Some mosquito strains or species are able to lay eggs without taking a blood meal, a trait named autogeny. This may allow populations to persist through times or places where vertebrate hosts are scarce. Autogenous egg production is highly dependent on the environment in some species, but the ideal conditions for its expression in Aedes aegypti mosquitoes are unknown. We found that 3.2% of females in a population of Ae. aegypti from Kenya were autogenous. Autogeny was strongly influenced by temperature, with many more eggs laid at 28 degrees C compared with 22 degrees C. Good nutrition in larval stages and feeding on higher concentrations of sugar solution during the adult stage both result in more autogenous eggs being produced. The trait also has a genetic basis, as not all Ae. aegypti genotypes can lay autogenously. We conclude that Ae. aegypti requires a favorable environment and a suitable genotype to be able to lay eggs without a blood meal.