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Enhancing Photosynthetic Starch Production by γ-Aminobutyric Acid Addition in a Marine Green Microalga Tetraselmis subcordiformis under Nitrogen Stress
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-23 , DOI: 10.1021/acs.iecr.0c00398 Wenyi Ran 1 , Qi Xiang 1 , Yunyun Pan 1 , Tonghui Xie 1 , Yongkui Zhang 1 , Changhong Yao 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-23 , DOI: 10.1021/acs.iecr.0c00398 Wenyi Ran 1 , Qi Xiang 1 , Yunyun Pan 1 , Tonghui Xie 1 , Yongkui Zhang 1 , Changhong Yao 1
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Microalgal starch, a potential feedstock for renewable fuels and chemicals, is usually induced under stress, which hinders the simultaneous enhancement of starch content and yield. This study applied γ-aminobutyric acid (GABA) to modulate cell metabolism for improving photosynthetic starch production in microalga Tetraselmis subcordiformis under nitrogen limitation (±N) and depletion (−N). Under ±N, 2.5 mM GABA abated nitrogen metabolism but enhanced starch content by 27% with an uncompromised starch yield due to the moderate inhibition of cell growth and elevated photoprotection. Under −N, 10 mM GABA entitled improved stress tolerance and enhanced starch content by 23.4% with a simultaneous 28.6% promotion of starch yield. The maximum starch content and yield under this condition reached 69.0% DW and 1.84 g L–1, respectively, which represented the highest starch levels in this microalga and exceeded most of the starch production performance among the microalgae reported. GABA addition was promising to improve microalgal starch production.
中文翻译：
氮胁迫下海洋绿色微藻次生球藻中γ-氨基丁酸的添加提高光合淀粉的产量
微藻淀粉是可再生燃料和化学品的潜在原料，通常在压力下被诱导，这阻碍了淀粉含量和产量的同时提高。这项研究应用γ-氨基丁酸（GABA）调节细胞代谢，以改善在氮限制（±N）和耗竭（-N）下微藻次附睾微藻的光合淀粉生产。在±N下，由于中等程度地抑制细胞生长和提高的光保护作用，2.5 mM GABA减少了氮代谢，但淀粉含量增加了27％，淀粉收率未受影响。在-N下，10 mM GABA的抗逆性得到提高，淀粉含量提高了23.4％，同时淀粉产量提高了28.6％。在此条件下，最大淀粉含量和产量达到69.0％DW和1.84 g L–1分别代表了该微藻中最高的淀粉含量，并超过了所报道的微藻中大部分的淀粉生产性能。添加GABA有望改善微藻淀粉的生产。
更新日期：2020-03-23
中文翻译：
氮胁迫下海洋绿色微藻次生球藻中γ-氨基丁酸的添加提高光合淀粉的产量
微藻淀粉是可再生燃料和化学品的潜在原料，通常在压力下被诱导，这阻碍了淀粉含量和产量的同时提高。这项研究应用γ-氨基丁酸（GABA）调节细胞代谢，以改善在氮限制（±N）和耗竭（-N）下微藻次附睾微藻的光合淀粉生产。在±N下，由于中等程度地抑制细胞生长和提高的光保护作用，2.5 mM GABA减少了氮代谢，但淀粉含量增加了27％，淀粉收率未受影响。在-N下，10 mM GABA的抗逆性得到提高，淀粉含量提高了23.4％，同时淀粉产量提高了28.6％。在此条件下，最大淀粉含量和产量达到69.0％DW和1.84 g L–1分别代表了该微藻中最高的淀粉含量，并超过了所报道的微藻中大部分的淀粉生产性能。添加GABA有望改善微藻淀粉的生产。
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