Fig. 7: Possible evolutionary scenarios for the evolution of short trichomes and long hairs on Nigella petals. | Nature Communications

Fig. 7: Possible evolutionary scenarios for the evolution of short trichomes and long hairs on Nigella petals.

From: Evolution of short trichomes and long hairs on Nigella petals through co-option of bHLH and non-MIXTA MYB genes

Fig. 7: Possible evolutionary scenarios for the evolution of short trichomes and long hairs on Nigella petals.

a, b Schematic diagrams showing expression patterns of MYB5-2 (a) and TT8 (b) in S7 and S10 petals of Nigella damascena and N. integrifolia. The expression signals are marked by brown shadings. Scale bars: 200 μm. c Evolutionary history of petal hairs/trichomes in Nigella. The simplified phylogenetic tree and divergence times were adopted from a previous study32. Schematic diagrams (I)–(V) show petals of five representative Nigella species. From nodes -1 to 1, independent co-option of TT8 and MYB5-2 has resulted in the origination of STs and LHs, respectively. Scale bars: 1 mm. d Molecular mechanisms underlying the formation of trichomes/hairs on Nigella petals. Top: a refined functional model for the formation of LHs and STs on petals of N. damascena. Bottom: a deduced model for the formation of T1Hs and T2Hs on petals of N. integrifolia. The interactions among proteins of genes of interest are illustrated in reference to Arabidopsis thaliana. LHs, long hairs; STs, short trichomes; T1Hs, Type 1 hairs; T2Hs, Type 2 hairs.

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