Site-specific phosphorylation of TRANSPARENT TESTA GLABRA1 mediates carbon partitioning in Arabidopsis seeds

Seed development relies upon carbon supplied by the parent plant. Here the authors propose that in Arabidopsis, phosphorylation of TTG1 by SHAGGY-like kinases 11/12 acts to regulate carbon flow between fatty acid synthesis in the embryo and mucilage and flavonoid production in the seed coat.