Figure S1. Alignment of identified AtMYB93/92/53 homologues in land plants, used to infer the phylogeny in Figure 1B. Supporting information Figs S1-S7.

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Figure S1. Alignment of identified AtMYB93/92/53 homologues in land plants, used to infer the phylogeny in Figure 1B. Supporting information Figs S1-S7

myb AtMYB93 (At1g34670) (a)(b)(c) * *** 35S:MYB93 *** Lateral roots/cm Col-0 myb Figure S2. (a) Intron-exon structure of the AtMYB93 gene coding region, showing the location of the Atmyb93- 2 T-DNA insertion in the 5’-UTR. Arrows show location of primers used for RT-PCR in (b). (b) RT-PCR of AtMYB93 full length transcript in wild type (Col-0) and two independent Atmyb93-2 seedling populations. (c) The Atmyb93-2 mutant has a greater LR density than wild type plants. Two independent 35S::MYC::AtMYB93 lines have reduced LR density relative to wild type plants. Data are from 10 day old seedlings (n>20 for all lines). Error bars: ± SE. t-tests: *p<0.05; ***p<0.001 Col myb93-2 AtMYB93 ACTIN2 Figure S3. (a) Intron-exon structure of the AtMYB92 gene coding region, showing the location of the Atmyb92 T-DNA insertion in exon 2. (b) qRT-PCR of AtMYB92 transcript in wild type and Atmyb92 seedlings.. (c) PR length is not significantly altered in the Atmyb92 mutant seedlings relative to wild type (n>60). (d) LR density is not significantly altered in the Atmyb92 mutant seedlings relative to wild type (n>60). SM_3_ AtMYB92 (At5g10280) (a) 1 (b) 0 Col-0 myb92 Relative AtMYB92 expression Primary root length (cm) Col-0myb92 Lateral roots/cm myb Col-0 (c) (d)

Figure S4. PR length is slightly reduced relative to wild type in 35S::MYC-AtMYB93 seedlings. Error bars: ± SE. t-tests: ***p< Primary root length (cm) Col S:MYB93 *** Figure S5. (a) qRT-PCR analysis of AtMYB53 and AtMYB92 expression in 8-day old seedlings treated for 8 h with increasing concentrations of exogenous IAA. (b) qRT-PCR analysis of AtMYB953 and AtMYB92 expression in 8-day old seedlings treated for 8 h with increasing concentrations of exogenous ABA. Error bars: ± SE. t-tests: ***p< Relative expression µM IAA 1 µM IAA 10 µM IAA AtMYB53AtMYB92 (a) Relative expression *** AtMYB53 AtMYB92 0 µM ABA 1 µM ABA 10 µM ABA 100 µM ABA (b)

Lateral roots/cm xMS Col-0 Atmyb * * NPA > 0.5xMS Figure S6. Atmyb93 mutants grown on NPA for 7 days and then transferred to 0.5 MS are still able to produce more lateral roots than wild type plants. Roots counted at day 11 (n>60) Error bars: ± SE. t-tests: *p<0.05. Figure S7. (e) qRT-PCR analysis of AtMYB93, -92 and -53 relative expression in 8 day old seedlings shows no difference in expression levels in the arabidillo1/2 mutant relative to wild type (n=3). (f) qRT-PCR analysis of ARABIDILLO1 relative expression in 8 day old seedlings shows no difference in expression levels in Atmyb93-1 single or Atmyb92 Atmyb93-1 double mutants relative to wild type (n=3). (b) Relative expression ARABIDILLO1 Col-0 myb93-1 myb93-1 myb92 Relative expression Col-0ara1/2 MYB93MYB92 MYB53 (a)