4.8 Article

Enhanced coproduction of astaxanthin and lipids by the green microalga Chromochloris zofingiensis: Selected phytohormones as positive stimulators

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BIORESOURCE TECHNOLOGY
卷 295, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122242

关键词

Chromochloris zofingiensis; Astaxanthin; Lipids; Phytohormones; Induction

资金

  1. program of Science and Technology of Guangzhou [201704030084]
  2. SinoPec Technology Development Program, China [218017-1, 36100002-19-FW20990035]
  3. 111 Project, China [B17018]

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Phytohormones comprise a variety of trace bioactive compounds that can stimulate cell growth and promote metabolic shifts. In the present work, a two-stage screening strategy was innovatively established to identify positive phytohormones for enhancement of astaxanthin and lipid coproduction in microplate-based cultures of mixotrophic Chromochloris zofingiensis. The results showed that auxins were the most efficient stimulators for astaxanthin accumulation. The maximum content of 13.1 mg/g and yield of 89.9 mg/L were obtained using indole propionic acid (10 mg/L) and indoleacetic acid (7.8 mg/L), representing the highest levels of astaxanthin in this microalga reported to date. Total lipids with the highest content (64.5% DW) and productivity (445.7 mg/L/d) were coproduced with astaxanthin using indoleacetic acid. Statistical analysis revealed close relations between phytohormones and astaxanthin and lipid biosynthesis. This study provides a novel original strategy for improving astaxanthin and lipid coproduction in C. zofingiensis using the selected phytohormones as positive stimulators.

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