Carlactone‐independent seedling morphogenesis in Arabidopsis

• DOI: 10.1111/tpj.12265
• Publication Date: 2013-06-16T11:58:36Z
• Authors: Adrian Scaffidi; Mark T. Waters; Emilio L. Ghisalb...; Kingsley W. Dixon; Gavin R. Flematti; Steven M. Smith
• Keywords: Strigolactone

Strigolactone hormones are derived from carotenoids via carlactone, and act through the α/β-hydrolase D14 F-box protein D3/MAX2 to repress plant shoot branching. While MAX2 is also necessary for normal seedling development, known strigolactone biosynthesis genes not, raising question of whether endogenous, canonical strigolactones carlactone have a role in morphogenesis. Here, we report chemical synthesis precursor show that it represses Arabidopsis branching influences leaf morphogenesis mechanism dependent on cytochrome P450 MAX1. In contrast, both physiologically active Z-carlactone non-physiological E isomer exhibit similar weak activity seedlings, predominantly signal rather than its paralogue KAI2, MAX2-dependent but MAX1-independent manner. KAI2 essential morphogenesis, hence this early-stage development employs carlactone-independent morphogens which karrikins wildfire smoke specific surrogates. commonly employed synthetic GR24 acts non-specifically effector signalling MAX1 D14.