Evolution of strigolactone receptors by gradual neo-functionalization of KAI2 paralogues.

ABSTRACT:

Background

Strigolactones (SLs) are a class of plant hormones that control many aspects of plant growth. The SL signalling mechanism is homologous to that of karrikins (KARs), smoke-derived compounds that stimulate seed germination. In angiosperms, the SL receptor is an α/β-hydrolase known as DWARF14 (D14); its close homologue, KARRIKIN INSENSITIVE2 (KAI2), functions as a KAR receptor and likely recognizes an uncharacterized, endogenous signal ('KL'). Previous phylogenetic analyses have suggested that the KAI2 lineage is ancestral in land plants, and that canonical D14-type SL receptors only arose in seed plants; this is paradoxical, however, as non-vascular plants synthesize and respond to SLs.

Results

We have used a combination of phylogenetic and structural approaches to

SUBMITTER: Bythell-Douglas R 

PROVIDER: S-EPMC5490202 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature