Comparative genomic analysis of the R2R3 MYB secondary cell wall regulators of Arabidopsis, poplar, rice, maize, and switchgrass

Zhao, Kangmei; Bartley, Laura E

doi:10.1186/1471-2229-14-135

Table 1 Secondary cell wall (SCW)-associated R2R3 MYBs in dicots and grasses, organized based on phylogenetic tree topology

From: Comparative genomic analysis of the R2R3 MYB secondary cell wall regulators of Arabidopsis, poplar, rice, maize, and switchgrass

Subgroup	Name	Function	Regulation and Phenotype	Reference
G29	AtMYB26	Activator	Overexpression results in ectopic induction of SCW thickening and lignification.	[27]
G30	AtMYB103	Activator	Loss of function mutant reduces syringyl lignin; Overexpression increases SCW thickening in fibers; Regulates pollen development.	[28–30]
G21	AtMYB69	Activator	Dominant repression reduces SCW thickening in both interfascicular fibers and xylary fibers in stems.	[31]
G31	AtMYB46	Activator	Dominant repression reduces SCW thickening of fibers and vessels; Overexpression mutant leads to ectopic deposition of secondary walls.	[31–36]
G31	AtMYB83	Activator	Functionally redundant with AtMYB46; Overexpression induces ectopic SCW deposition.	[33, 36]
G31	ZmMYB46	Activator	Overexpression in Arabidopsis induces ectopic deposition of lignin and xylan and an increases accumulation of cellulose in the walls of epidermis.	[37]
G31	OsMYB46	Activator	Overexpression in Arabidopsis induces ectopic deposition of lignin and xylan and an increases accumulation of cellulose in the walls of epidermis.	[37]
G31	PtrMYB20	Activator	Overexpression activates the biosynthetic pathway genes of cellulose, xylan and lignin.	[38]
G31	PtrMYB3	Activator	Overexpression activates the biosynthetic pathways genes of cellulose, xylan and lignin.	[38]
G8	AtMYB20	Activator	Activated by SND1 and NST1.	[31]
G8	AtMYB43	Activator	Activated by SND1 and NST1.	[31]
G8	AtMYB42	Activator	Activated by SND1 and NST1.	[31]
G8	AtMYB85	Activator	Overexpression results in ectopic deposition of lignin in epidermal and cortical cells in stems; Dominant repression reduces SCW thickening in both stem interfascicular fibers and xylary fibers.	[31]
G21	AtMYB52	Activator	Dominant repression reduces SCW thickening in both stem interfascicular fibers and xylary fibers.	[31]
G21	AtMYB54	Activator	Dominant repression reduced SCW thickening in both stem interfascicular fibers and xylary fibers.	[31]
G3.a	AtMYB58	Activator	Dominant repression reduces SCW thickening and lignin content; Overexpression causes ectopic lignification.	[30]
G3.a	AtMYB63	Activator	Dominant repression reduces SCW thickening and lignin content; Overexpression causes ectopic lignification.	[30]
G13.b	AtMYB61	Activator	Loss of function mutant reduces xylem vessels and lignification; Affects water and carbon allocation.	[39, 40]
G4	AtMYB4	Repressor	Response to UV-B; Overexpression lines show white lesion in old leaves.	[41, 42]
G4	AtMYB32	Repressor	Regulates pollen formation.	[42]
G4	ZmMYB31	Repressor	Overexpression reduces lignin content without changing composition.	[43]
G4	ZmMYB42	Repressor	Overexpression decreases S to G ratio of lignin.	[43, 44]
G4	PvMYB4	Repressor	Overexpression represses lignin content.	[45]
G6	AtMYB75	Repressor	Represses lignin biosynthesis and cell wall thickening in xylary and interfascicular fibers.	[46]

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ISSN: 1471-2229

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