Preadaptation for asexual queen succession: queen tychoparthenogenesis produces neotenic queens in the termite Reticulitermes okinawanus
Preadaptation for asexual queen succession: queen tychoparthenogenesis produces neotenic queens in the termite Reticulitermes okinawanus
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DOI：
10.1007/s00040-018-0603-1
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发表时间：
2018-05-01
期刊：
影响因子：
1.3
通讯作者：
Matsuura, K.
中科院分区：
文献类型：
--
作者：
Nozaki, T.;Yashiro, T.;Matsuura, K.
社会性昆虫进化出了不同的繁殖系统。在散白蚁中，蚁后以单性生殖方式产生幼态更替，同时有性繁殖产生其他群体成员。这种无性蜂王继承（AQS）系统使殖民地能够进行蜂王继承，增加蜂王的数量，同时避免王-女近亲繁殖，否则会导致劳动力遗传多样性的丧失。这种复杂的繁殖系统的进化需要孤雌生殖能力和孤雌生殖者的发育优先权，以成为幼态女王。然而，这两个组成部分的演变过程是未知的。在这项研究中，我们调查了在非AQS白蚁物种的Reticulitermes okinawanus的孤雌生殖后代的种姓命运。未受精卵的孵化率在100%以上。Okinawanus（0.97%）显著低于AQS种R.精子（75%）。流式细胞仪和遗传分析表明，R。第二孤雌生殖产生二倍体纯合子雌性。未受精卵产生的三分之一的女儿发育成幼态，而有性繁殖的女儿则没有分化成幼态。这些结果表明，孤雌生殖的女儿有发展的倾向，成为幼态女王成立之前的AQS。
Social insects have evolved diverse breeding systems. In the termite species Reticulitermes speratus, queens produce their neotenic replacements parthenogenetically while producing other colony members sexually. This asexual queen succession (AQS) system enables the colony to undergo queen succession and increase the number of queens while avoiding king-daughter inbreeding, which must otherwise result in loss of genetic diversity in the workforce. The evolution of this sophisticated breeding system requires both parthenogenetic ability and parthenogens' developmental priority to become neotenic queens. However, the evolutionary process of these two components is unknown. In this study, we investigated the caste fate of the offspring produced by tychoparthenogenesis in a non-AQS termite species Reticulitermes okinawanus. The hatching rate of unfertilized eggs in R. okinawanus (0.97%) was much lower than that in the AQS species R. speratus (75%). Flow cytometry and genetic analyses were used to demonstrate that R. okinawanus tychoparthenogenesis produced diploid homozygous females. One-third of the daughters from unfertilized eggs developed into neotenics, while no sexually produced daughters differentiated into neotenics. These results suggest that parthenogenetic daughters have the developmental propensity to become neotenic queens prior to the inception of AQS.