Mother knows best: plant polyploidy affects feeding and oviposition preference of the alligator weed biological control agent, Agasicles hygrophila
Mother knows best: plant polyploidy affects feeding and oviposition preference of the alligator weed biological control agent, Agasicles hygrophila
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DOI：
10.1007/s10526-019-09959-9
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发表时间：
2019-12-01
期刊：
影响因子：
2.5
通讯作者：
Sosa, Alejandro J.
中科院分区：
文献类型：
--
作者：
Krug, Pamela;Sosa, Alejandro J.
空心莲子草（Alternanthera philoxeroides（Martius）Grisebach）是一种原产于南美洲的两栖入侵植物。它是一种异源多倍体，在阿根廷有两种细胞型，四倍体和六倍体。在外来范围内，该植物是生物控制与跳甲虫Agasicles hygrophila塞尔曼和沃格特，但有不同程度的成功。寄主植物的基因型是生物防治中需要考虑的一个重要因素。研究了扬子草倍性水平对扬子草产卵选择性的影响。研究了湿生植物的生态学特征及其与自然分布区雌虫取食偏好、卵存活率和幼虫生长发育的关系。雌虫能识别不同倍性的美洲鳄草，并且更喜欢在六倍体上产卵而不是四倍体。这种选择积极影响幼虫的性能，并可能解释在这种情况下，不同的植物cytotypes的偏好性能假说。在评价和优先选择生物防治剂时应考虑多倍性。
Alligator weed (Alternanthera philoxeroides (Martius) Grisebach) is an amphibious invasive plant native to South America. It is an allopolyploid that, in Argentina, possess two cytotypes, tetraploids and hexaploids. In the exotic range, the plant is biologically controlled with flea beetle Agasicles hygrophila Selman and Vogt but with different levels of success. The genotype of host plant is an important factor that needs to be considered in biological control programs. We studied how alligator weed ploidy level affects the oviposition preferences of A. hygrophila and its relation with female feeding preference, egg survival and larval performance in its native range. Females recognized the different ploidy levels of alligator weed and preferred to lay eggs on hexaploids than tetraploids. This choice positively affected larval performance and may be explained by the preference-performance hypothesis in this case for different plant cytotypes. Polyploidy should be considered in evaluating and prioritising biological control agents.