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| 论文摘要： | Duckweed has gained attention as a potential aquatic crop for starch and protein production. Compared to most duckweed species, Lemna trisulca (L. trisulca) is distinguished by its submerged habitat. In context of rising CO2 levels, which pose significant enviromental risks, duckweed presents potential as an effective carbon sequestration agent. Despite its relevance, research on L. trisulca for carbon sequestration remains limited, particularly when compared to microalgae. This study inestigates the effects of varying carbon dioxide (CO2) concentrations (400 ppm,10,000 ppm and 50,000 ppm) on the relative growth rate, biomass accumulation and enzyme activity of L. trisulca. The results indicated that CO2 supplementation significantly enhanced biomass production, photosynthetic pigment concentration, activity of photosynthetic enzymes, and starch/protein accumulation. Compared to ambient CO2 concentration, under the 50,000 ppm CO2 treatment, fresh weight, starch content and protein levels increased by 11.6 times, 3.3 times and 1.6 times, respectively. Furthermore, the carbon sequestration capacity in high concentration (HC) treatment group was 18.1 times higher than control concentration (CC) treatment groups and 3.4 times of that in media concentration (MC). This is the first study to explore the physiological response of L. trisulca to elevated CO2 concentrations. The specie demonstrated higher growth efficiency and carbon sequestration ability when exposed to high CO2 conditions. The findings provide critical insights into the potential application of L.trisulca in the process of carbon sequestration, and lay a foundation for the utilization of L.trisulca in sustainable bioenergy production. |
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