十万个为什么·科学阅读30篇（4）
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Why Do Certain Fungi Produce Bioluminescent Mycelium Only in Darkness?
为什么某些真菌仅在黑暗中产生发光菌丝？
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Species like Neonothopanus gardneri emit soft green light from their mycelial networks exclusively at night.
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A luciferin-luciferase reaction powers this glow, but the enzyme only activates when light-sensitive proteins detect darkness.
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Blue-light receptors suppress bioluminescence during daylight by blocking transcription of key luminescence genes.
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This circadian regulation conserves energy and avoids attracting daytime predators like birds or insects.
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The glow attracts nocturnal arthropods that disperse spores while feeding on fungal tissue or secretions.
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Researchers found that constant light exposure stops glowing within 48 hours—even if nutrients remain abundant.
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Fungal bioluminescence differs from marine organisms because it requires oxygen, luciferin, and ATP all simultaneously.
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Its spectral peak at 490 nm matches the visual sensitivity of many night-active insects perfectly.
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Field studies show higher spore dispersal rates under moonless nights compared to full-moon conditions.
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This adaptation highlights how evolution fine-tunes biological light emission for ecological timing and function.