Changes in the photosynthetic apparatus and lipid droplet formation in Chlamydomonas reinhardtii under iron deficiency

Photosynthesis Research
Elsinraju DevadasuRajagopal Subramanyam

Abstract

The unicellular photosynthetic alga Chlamydomonas reinhardtii was propagated in iron deficiency medium and patterns of growth, photosynthetic efficiency, lipid accumulation, as well as the expression of lipid biosynthetic and photosynthesis-related proteins were analysed and compared with iron-sufficient growth conditions. As expected, the photosynthetic rate was reduced (maximally after 4 days of growth) as a result of increased non-photochemical quenching (NPQ). Surprisingly, the stress-response protein LHCSR3 was expressed in conditions of iron deficiency that cause NPQ induction. In addition, the protein contents of both the PSI and PSII reaction centres were gradually reduced during growth in iron deficiency medium. Interestingly, the two generations of Fe deficiency cells could be able to recover the photosynthesis but the second generation cells recovered much slower as these cells were severely in shock. Analysis by flow cytometry with fluorescence-activated cell sorting and thin layer chromatography showed that iron deficiency also induced the accumulation of triacylglycerides (TAG), which resulted in the formation of lipid droplets. This was most significant between 48 and 72 h of growth. Dramatic increases in DGAT2A ...Continue Reading

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Citations

Jan 7, 2020·Journal of Bioenergetics and Biomembranes·Huda A Qari, Mohammad Oves
May 1, 2021·Frontiers in Plant Science·Elsinraju Devadasu, Rajagopal Subramanyam
Nov 1, 2020·Biochimica Et Biophysica Acta. Bioenergetics·Elsinraju DevadasuRajagopal Subramanyam

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Methods Mentioned

BETA
flow cytometry
electrophoresis
confocal microscopy
fluorescence microscopy
transacylation

Software Mentioned

PASCAL
PAM WINCONTROL

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