Tubule extension by plastids is due to increase in bilayer-forming galactolipids at the outer envelope membrane
Sporadically, all plastids produce dynamic tubular extensions in response to myriad stresses. Although the use of fluorescent proteins revealed these transient tubules to be stroma-filled and led to their being called stromules, the mechanism underlying tubule extension from a spheroidal plastid remained unknown. As plastids in viridiplantae have two bounding membranes the fluid stroma remains confined within the inner envelope membrane (IEM) while the outer envelope membrane (OEM) around the IEM forms the interface with the rest of the cytoplasm. Here, using a sucrose treatment for inducing tubules in the dark in transgenic Arabidopsis plants expressing different stroma and OEM-targeted fluorescent proteins we carried out comparative molecular-genetic and lipidomics analyses. Our data strongly suggest that plastid tubule formation occurs due to increase in bilayer-forming galactolipids such as digalactosyldiacylglycerol (DGDG) on the OEM. While the dynamic behaviour of stromules occurs within an external encasing OEM, stresses such as phosphate starvation and high light intensity cause the galactolipid-rich OEM-tubule projecting beyond the stromule to be shed into the cytoplasm. OEM shedding from long tubules with extended plastid outreach into the cell suggests their important role in dispersing plastid-derived, membrane-stabilizing, galactolipids to the rest of the cell to augment its resilience to stress.