Anionic lipids stabilize etioplast prolamellar bodies and facilitate thylakoid biogenesis during etioplast-to-chloroplast differentiation

In Arabidopsis thaliana, reduced phosphatidylglycerol biosynthesis (pgp1-1) makes prolamellar bodies more susceptible to light-induced disassembly, while infrared fixation preserves wild-type-like lattices.

• Why it matters: Anionic lipids are abundant in etioplast membranes, yet how phosphatidylglycerol and sulfoquinovosyldiacylglycerol shape etioplast-to-chloroplast remodeling and early chloroplast function is unclear.
• What they did: The study compared pgp1-1, sqd1, and the pgp1-1 sqd1 double mutant by analyzing PLB lattice integrity under white versus infrared light, alongside chlorophyll formation, internal membrane biogenesis, photosynthetic activation, and photosynthetic gene expression.
• The result: Illumination rapidly triggered protochlorophyllide-to-chlorophyll conversion and lamellar membrane formation in pgp1-1, but later chlorophyll accumulation was retarded; the pgp1-1 sqd1 double mutant showed more severe defects, implying PG supports membrane-associated steps and SQDG buffers development when PG is limited.

AI summary of the abstract · may contain errors · not medical advice · read the paper.