Observation of Significant Photosynthesis in Garden Cress and Cyanobacteria under Simulated Illumination from a K Dwarf Star

Iva Vilović, Dirk Schulze-Makuch, René Heller
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Abstract

Stars with about 45 to 80% the mass of the Sun, so-called K dwarf stars, have previously been proposed as optimal host stars in the search for habitable extrasolar worlds. These stars are abundant, have stable luminosities over billions of years longer than Sun-like stars, and offer favorable space environmental conditions. So far, the theoretical and experimental focus on exoplanet habitability has been on even less massive, though potentially less hospitable red dwarf stars. Here we present the first experimental data on the responses of photosynthetic organisms to a simulated K dwarf spectrum. We find that garden cress Lepidium sativum under K-dwarf radiation exhibits comparable growth and photosynthetic efficiency as under solar illumination on Earth. The cyanobacterium Chroococcidiopsis sp. CCMEE 029 exhibits significantly higher photosynthetic efficiency and culture growth under K dwarf radiation compared to solar conditions. Our findings of the affirmative responses of these two photosynthetic organisms to K dwarf radiation suggest that exoplanets in the habitable zones around such stars deserve high priority in the search for extrasolar life.
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在 K 矮星的模拟光照下观察花园芹菜和蓝藻的显著光合作用
质量约为太阳45%到80%的恒星,即所谓的K矮星,以前曾被提议作为寻找宜居太阳系外世界的最佳宿主星。这些恒星数量丰富,光度稳定,比类太阳恒星长数十亿年,并提供有利的空间环境条件。迄今为止,系外行星可居住性的理论和实验焦点一直集中在质量更小的红矮星上,尽管这些恒星可能更不适宜居住。在这里,我们首次展示了光合生物对模拟 K 矮星光谱反应的实验数据。我们发现,在 K 矮星辐射下,花园芹(Lepidium sativum)的生长和光合作用效率与地球上太阳光照射下相当。在 K 矮辐射条件下,蓝细菌 Chroococcidiopsis sp.我们对这两种光合成生物在K矮星辐射下的积极反应的研究结果表明,在寻找太阳系外生命的过程中,位于此类恒星周围可居住区的系外行星值得高度重视。
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