The Microalga Nannochloropsis during Transition from Quiescence to Autotrophy in Response to Nitrogen Availability
- Michigan State Univ., East Lansing, MI (United States); Nicolaus Copernicus Univ., Toruń (Poland)
- Michigan State Univ., East Lansing, MI (United States); Nicolaus Copernicus Univ., Toruń (Poland); Univ. of Goettingen (Germany)
- Michigan State Univ., East Lansing, MI (United States)
- Univ. of Goettingen (Germany)
The marine microalgae Nannochloropsis oceanica (CCMP1779) is a prolific producer of oil and is considered a viable and sustainable resource for biofuel feedstocks. Nitrogen (N) availability has a strong impact on the physiological status and metabolism of microalgal cells, but the exact nature of this response is poorly understood. To fill this gap we performed transcriptomic profiling combined with cellular and molecular analyses of N. oceanica CCMP1779 during the transition from quiescence to autotrophy. N deprivation-induced quiescence was accompanied by a strong reorganization of the photosynthetic apparatus and changes in the lipid homeostasis, leading to accumulation of triacylglycerol. Cell cycle activation and reestablishment of photosynthetic activity observed in response to resupply of the growth medium with N were accompanied by a rapid degradation of triacylglycerol stored in lipid droplets (LDs). Besides observing LD translocation into vacuoles, we also provide evidence for direct interaction between the LD surface protein (NoLDSP) and AUTOPHAGY-RELATED8 (NoATG8) protein and show a role of microlipophagy in LD turnover in N. oceanica CCMP1779. This knowledge is crucial not only for understanding the fundamental mechanisms controlling the cellular energy homeostasis in microalgal cells but also for development of efficient strategies to achieve higher algal biomass and better microalgal lipid productivity.
- Research Organization:
- Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- FG02-91ER20021; FC02-07ER64494; MCB1714561; IOS-1354721
- OSTI ID:
- 1574533
- Alternate ID(s):
- OSTI ID: 1735509
- Journal Information:
- Plant Physiology (Bethesda), Vol. 182, Issue 2; ISSN 0032-0889
- Publisher:
- American Society of Plant BiologistsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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