Unusual chromosome numbers and polyploidy in invasive fire ant populations
Unusual chromosome numbers and polyploidy in invasive fire ant populations
复制标题
DOI：
10.1007/s10709-021-00128-4
复制
发表时间：
2021-07
期刊：
影响因子：
1.5
通讯作者：
T. Murakami;C. Paris;M. Chirino;Chifune Sasa;H. Sakamoto;S. Higashi;Kazuki Sato
中科院分区：
文献类型：
--
作者：
T. Murakami;C. Paris;M. Chirino;Chifune Sasa;H. Sakamoto;S. Higashi;Kazuki Sato
火蚁（Solenopsis invictaBuren in J Ga Entomol Soc 7：1-26，1972）是一种入侵性外来蚂蚁物种，于20世纪30年代首次从南美洲传播到美国，到20世纪世纪末传播到美国南部，到21世纪世纪传播到大洋洲、台湾和中国，最后于2017年传播到日本和韩国。由于这些蚂蚁具有显著的负面经济，人类健康和环境影响，本研究的目的是积累有关火蚁的细胞遗传学信息，并为制定管理策略提供基础数据。火蚁从入侵种群从台湾，佛罗里达（美国），布宜诺斯艾利斯（阿根廷），和本地人口从伊瓜苏港（阿根廷），他们的起源点，并分析了染色体数目，形态，和多倍性，银染核仁组成区（Ag-NORs），和18 S rDNA和端粒荧光原位杂交（FISH）。结果表明：（1）入侵种群的火蚁与本地种群的染色体形态存在差异，（2）佛罗里达和台湾种群的染色体数目和多倍性变异较大，（3）台湾种群的间期细胞Ag-NOR信号显著增加，信号数目与距离本地种群的距离显著正相关;（4）18 SrDNA和端粒FISH分析也显示了信号的多样性。这些特征的变化被假设是由于（1）密切相关的物种或遗传上远距离的种群之间的杂交和杂交的影响，以及（2）大量喷洒杀虫剂防治害虫的潜在影响。
Fire ants (Solenopsis invictaBuren in J Ga Entomol Soc 7:1–26, 1972), an invasive alien ant species, first spread from South America to the United States in the 1930s, the southern part of the United States by the end of the twentieth century, Oceania, Taiwan, and China in the twenty-first century, and finally to Japan and South Korea in 2017. As these ants have significant negative economic, human health, and environmental impacts, the purpose of this research was to accumulate cytogenetic information regarding fire ants and provide basic data for developing management strategies for their control. Fire ants were collected from invasive populations from Taiwan, Florida (USA), and Buenos Aires (Argentina), and a native population from Puerto Iguazu (Argentina), their point of origination, and analyzed with regard to chromosome number, morphology, and polyploidy, silver-stained nucleolar organizer regions (Ag-NORs), and 18S rDNA and telomere fluorescence in situ hybridization (FISH). The results showed that (1) fire ants from invaded populations differed in chromosome morphology compared to those from native populations; (2) the Florida and Taiwanese fire ant populations evinced greater variability in chromosome numbers and polyploidy variations; (3) the Taiwanese population exhibited significantly increased Ag-NOR signals in interphase cells, with signal number significantly positively correlating with distance from native populations; and (4) substantial diversity of signals was also apparent following 18S rDNA and telomere FISH analyses. Variation in these characteristics were hypothesized to be due to (1) the effect of hybridizations and interbreeding between closely related species or genetically distant populations, and (2) the potential effect of large amounts of insecticides sprayed for pest control.