Annual rhythmicity in the switching of reproductive mode in planarians

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2022-12-01 DOI:10.1016/j.zool.2022.126053

Hanae Nodono, Midori Matsumoto

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Abstract

Species of planarians include both asexually reproducing individuals (reproduce through fission and regeneration) and sexually reproducing individuals (hermaphrodites that mate to produce cocoons). While some individuals can switch between the asexual and sexual modes of reproduction. In this study, we examined the reproductive modes and ploidy of Dugesia japonica and Dugesia ryukyuensis from three spring wells in Okinawa (Japan) during two consecutive years. D. japonica are mostly asexual and triploid. In contrast, only 40 % of D. ryukyuensis are asexual and triploid; the remaining are sexual, and diploid or triploid. The sexually reproductive season of D. ryukyuensis is winter. In July, the reproductive organs disappear, and the individuals start asexual reproduction through fission and regeneration. In January of the following year, the individuals develop ovaries and necessary reproductive organs and start sexual reproduction. When these species were lab-reared for a longer period, the reproductive cycles in three strains were repeated for three years. These results confirm that D. ryukyuensis population in Okinawa switches between reproductive modes on an annual cycle, even when kept under constant temperature and no light/dark cycle.

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涡虫生殖模式转换的年节律性

涡虫的种类包括无性繁殖的个体(通过裂变和再生繁殖)和有性繁殖的个体(交配产生茧的雌雄同体)。虽然有些个体可以在无性繁殖和有性繁殖模式之间切换。本研究连续2年在日本冲绳的3口泉水井中对日本杜格斯(Dugesia japonica)和琉球杜格斯(Dugesia ryukyyuensis)的繁殖方式和倍性进行了研究。粳稻多为无性和三倍体。相比之下，只有40%的琉球龙种是无性和三倍体;其余的是有性的，二倍体或三倍体。龙井草的有性繁殖季节为冬季。7月，生殖器官消失，个体通过裂变和再生开始无性繁殖。第二年1月，个体发育卵巢和必要的生殖器官，开始有性繁殖。当这些物种在实验室饲养较长一段时间后，三种菌株的繁殖周期重复了三年。这些结果证实，即使在恒温和无明暗循环的条件下，冲绳的龙井蛙种群也会以年为周期在繁殖模式之间切换。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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