School of Biological Sciences, Life Sciences Building, University of Bristol, Bristol BS8 1TQ, UK.
School of Biological Sciences, Life Sciences Building, University of Bristol, Bristol BS8 1TQ, UK.
Curr Biol. 2018 Aug 20;28(16):R869-R870. doi: 10.1016/j.cub.2018.07.027.
Marimo are unusual, attractive and endangered spherical aggregations of the filamentous green macroalga Aegagropila linnaei (Figure 1A-E) [1]. Globally rare, marimo populations persist in cold freshwater lakes in Japan, Iceland and Ukraine. Marimo occupy both the lake bed and rise to the lake surface [2,3]. Here, we show that marimo buoyancy is conferred by bubbles arising from photosynthesis. We find that light-induced acquisition of buoyancy by marimo is circadian-regulated. We identify that there are circadian rhythms of photosynthesis in marimo, which might explain the circadian rhythm of buoyancy in response to light. This identifies a circadian-regulated buoyancy response in an intriguing and little-studied plant.
藻球是一种不寻常的、有吸引力的、处于濒危状态的丝状绿藻 Aegagropila linnaei 的球形聚集物（图 1A-E）[1]。藻球在全球范围内较为罕见，仅存在于日本、冰岛和乌克兰的冷水湖泊中。藻球既存在于湖底，也生长在湖面[2,3]。在这里，我们证明了藻球的浮力是由光合作用产生的气泡赋予的。我们发现，藻球通过光合作用获得浮力的过程是受昼夜节律调节的。我们发现藻球存在光合作用的昼夜节律，这可能解释了对光的浮力昼夜节律响应。这表明在一种有趣且研究较少的植物中存在昼夜节律调节的浮力响应。
