A revised mineral nutrient supplement increases biomass and growth rate in Chlamydomonas reinhardtii

Plant Journal - Tập 66 Số 5 - Trang 770-780 - 2011
Janette Kropat1, Anne Hong‐Hermesdorf1, David Casero2, Petr Ent1, Madeli Castruita1, Matteo Pellegrini2,3, Sabeeha Merchant1,3, Davin Malasarn1
1Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095–1569, USA.
2Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095 1569, USA
3Institutes of Genomic and Proteomics, University of California, Los Angeles, CA 90095 1569, USA

Tóm tắt

SummaryInterest in exploiting algae as a biofuel source and the role of inorganic nutrient deficiency in inducing triacylglyceride (TAG) accumulation in cells necessitates a strategy to efficiently formulate species‐specific culture media that can easily be manipulated. Using the reference organism Chlamydomonas reinhardtii, we tested the hypothesis that modeling trace element supplements after the cellular ionome would result in optimized cell growth. We determined the trace metal content of several commonly used Chlamydomonas strains in various culture conditions and developed a revised trace element solution to parallel these measurements. Comparison of cells growing in the revised supplement versus a traditional trace element solution revealed faster growth rates and higher maximum cell densities with the revised recipe. RNA‐seq analysis of cultures growing in the traditional versus revised medium suggest that the variation in transcriptomes was smaller than that found between different wild‐type strains grown in traditional Hutner’s supplement. Visual observation did not reveal defects in cell motility or mating efficiency in the new supplement. Ni2+‐inducible expression from the CYC6 promoter remained a useful tool, albeit with an increased requirement for Ni2+ because of the introduction of an EDTA buffer system in the revised medium. Other advantages include more facile preparation of trace element stock solutions, a reduction in total chemical use, a more consistent batch‐to‐batch formulation and long‐term stability (tested up to 5 years). Under the new growth regime, we analyzed cells growing under different macro‐ and micronutrient deficiencies. TAG accumulation in N deficiency is comparable in the new medium. Fe and Zn deficiency also induced TAG accumulation, as suggested by Nile Red staining. This approach can be used to efficiently optimize culture conditions for other algal species to improve growth and to assay cell physiology.

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Plant Journal

Tập 66 Số 5

770-780

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