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<p><i>Trichodesmium</i>, a nitrogen-fixing cyanobacterium, has recently been shown to release methane through utilization of the organic phosphorus methylphosphonate (MPn), which is commonly found in surface oceans. We demonstrated previously that methane production (MP) increased with rising temperatures and was positively correlated with assimilations of carbon and nitrogen under optimal light conditions. Here, we show that when grown under light-limitation, elevated temperatures within a range of 23 °C to 31 °C reduced growth by 67% and MP by 91%, with altered relationship of MP to assimilations of C, N and P. This indicates that light-limitation disrupted the synergy of MP with the C/N/P assimilations, highlighting that photosynthetic energy supply affects methane production to differential extents with increasing temperatures. Our results imply that <i>Trichodesmium</i> in deeper waters or exposed to low light conditions produces much less methane even under ocean warming scenarios.</p>

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Light limitation reduces proportion of the released methane to assimilated carbon and nitrogen in the N2-fixing cyanobacterium Trichodesmium

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Chuze Zou,
  • Kunshan Gao

摘要

Trichodesmium, a nitrogen-fixing cyanobacterium, has recently been shown to release methane through utilization of the organic phosphorus methylphosphonate (MPn), which is commonly found in surface oceans. We demonstrated previously that methane production (MP) increased with rising temperatures and was positively correlated with assimilations of carbon and nitrogen under optimal light conditions. Here, we show that when grown under light-limitation, elevated temperatures within a range of 23 °C to 31 °C reduced growth by 67% and MP by 91%, with altered relationship of MP to assimilations of C, N and P. This indicates that light-limitation disrupted the synergy of MP with the C/N/P assimilations, highlighting that photosynthetic energy supply affects methane production to differential extents with increasing temperatures. Our results imply that Trichodesmium in deeper waters or exposed to low light conditions produces much less methane even under ocean warming scenarios.