PMID:23684976

Citation	Hofhuis, H, Laskowski, M, Du, Y, Prasad, K, Grigg, S, Pinon, V and Scheres, B' (2013) Phyllotaxis and Rhizotaxis in Arabidopsis Are Modified by Three PLETHORA Transcription Factors. Curr. Biol. '
Abstract	BACKGROUND: The juxtaposition of newly formed primordia in the root and shoot differs greatly, but their formation in both contexts depends on local accumulation of the signaling molecule auxin. Whether the spacing of lateral roots along the main root and the arrangement of leaf primordia at the plant apex are controlled by related underlying mechanisms has remained unclear. RESULTS: Here, we show that, in Arabidopsis thaliana, three transcriptional regulators implicated in phyllotaxis, PLETHORA3 (PLT3), PLT5, and PLT7, are expressed in incipient lateral root primordia where they are required for primordium development and lateral root emergence. Furthermore, all three PLT proteins prevent the formation of primordia close to one another, because, in their absence, successive lateral root primordia are frequently grouped in close longitudinal or radial clusters. The triple plt mutant phenotype is rescued by PLT-vYFP fusion proteins, which are expressed in the shoot meristem as well as the root, but not by expression of PLT7 in the shoot alone. Expression of all three PLT genes requires auxin response factors ARF7 and ARF19, and the reintroduction of PLT activity suffices to rescue lateral root formation in arf7,arf19. CONCLUSIONS: Intriguingly PLT 3, PLT5, and PLT7 not only control the positioning of organs at the shoot meristem but also in the root; a striking observation that raises many evolutionary questions.
Links	PubMed Online version:10.1016/j.cub.2013.04.048
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
ARATH:PLT3		GO:0010311: lateral root formation	ECO:0000315:		P		Figure 2	complete CACAO 8440
ARATH:PLT3	involved_in	GO:0010311: lateral root formation	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
ARATH:PLT5		GO:0010311: lateral root formation	ECO:0000315:		P		Figure 2	complete CACAO 8441
ARATH:PLT5	involved_in	GO:0010311: lateral root formation	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete

References

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