Photoperiod controls egg laying and caudodorsal cell hormone expression but not gonadal development in the pond snail Lymnaea stagnalis
Photoperiod controls egg laying and caudodorsal cell hormone expression but not gonadal development in the pond snail Lymnaea stagnalis
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DOI：
10.1007/s00359-021-01494-2
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发表时间：
2021-06-06
影响因子：
2.1
通讯作者：
Shiga, Sakiko
中科院分区：
文献类型：
--
作者：
Kitai, Hitomi;Kakuda, Umi;Shiga, Sakiko
光周期是调节植物生长和繁殖以适应季节变化的可靠信号。虽然光周期性在脊索动物和节肢动物中已经得到了很好的研究，但对软体动物的了解较少。我们研究了光周期的影响产卵，身体大小，性腺指数，卵母细胞的大小和相对量的caudodorthal细胞激素mRNA在个人饲养条件下的池塘蜗牛滞流。孵化后25周，光照12 h，黑暗12 h（12 L：12 D）条件下的产卵螺百分率显著低于长日照条件下的产卵螺百分率。12 L：12 D条件下的总卵数和卵块数均显著低于长日照条件下。16 L：8 D和12 L：12 D在软体部和卵睾部重量以及性腺-体细胞指数方面没有显著差异。光周期效应也没有观察到卵母细胞直径孵化后22周。27周后，12 L：12 D条件下，尾背细胞激素mRNA含量显著低于16 L：8D条件下。L. stagnalis在产卵和尾背细胞激素mRNA的表达方面表现出明显的光周期反应，但在性腺发育方面没有表现出明显的光周期反应。12 L：12 D抑制尾背细胞激素的表达可能会抑制产卵。
Photoperiod is a reliable cue to regulate growth and reproduction for seasonal adaptation. Although photoperiodism has been well studied in Chordata and Arthropoda, less is known about Mollusca. We examined photoperiodic effects on egg laying, body size, gonad-somatic index, oocyte size and relative amounts of caudodorsal cell hormone mRNA in individual rearing conditions in the pond snail Lymnaea stagnalis. Twenty-five weeks after hatching, the percentages of egg-laying snails under a photoperiod of 12 h light and 12 h darkness (12L:12D) were significantly smaller than those under longer days. The total numbers of eggs and egg masses under 12L:12D were significantly smaller than those under longer days. Significant differences between 16L:8D and 12L:12D were not observed in the soft body and ovotestis weight, and the gonad-somatic index. Photoperiodic effects were also not observed in oocyte diameters twenty-two weeks after hatching. Twenty-seven weeks after hatching amounts of caudodorsal cell hormone mRNA were significantly lower in the cerebral ganglia with commissure under 12L:12D than 16L:8D. L. stagnalis exhibited a clear photoperiodic response in egg laying and the amount of caudodorsal cell hormone mRNA, but not in gonadal development. Under 12L:12D suppression of caudodorsal cell hormone expression might suppress egg laying.