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Analysis of auxin responses in the fern Ceratopteris richardii identifies the developmental phase as a major determinant for response properties.

Woudenberg, S., et al. · 2024 · Development   research

doi:10.1242/dev.203026   PMID:39324436   PMC11449451

Linked genes (7)  2 core 5 peripheral

Gene ID	Name	Evidence / Role	Function (this paper)
Mp1g12750	MpARF1	experimental subject	The single A-class ARF of Marchantia; the arf1-4 loss-of-function mutant was complemented with a tagged wild-type copy and a higher-expressing line selected to test whether elevated A-class ARF levels enhance auxin responsiveness. Increased MpARF1 expression did not broadly enhance auxin sensitivity, used to probe how the simple Marchantia auxin module compares with the fern.
Mp6g05000	MpIAA	experimental subject	The single Aux/IAA of Marchantia; an additional copy expressed under the MpARF2 promoter altered overall phenotype and increased auxin sensitivity versus Tak-1. The extra MpIAA protein, like the endogenous one, was undetectable normally but accumulated upon proteasome inhibition, showing Aux/IAA copy number modulates response amplitude.
—	MpAPT3 missing	experimental tool	Used as an RT-qPCR reference gene (geometric mean of MpSAND/MpAPT7/MpAPT3) to normalize MpARF1 expression.
—	MpAPT7 missing	experimental tool	Used as an RT-qPCR reference gene (geometric mean of MpSAND/MpAPT7/MpAPT3) to normalize MpARF1 expression.
Mp4g11820	MpARF2	experimental tool	MpARF2 promoter (+3 kb upstream) was cloned and used to drive the additional MpIAA transgene copy.
Mp4g07110	MpSAND missing	experimental tool	Used as an RT-qPCR reference gene (geometric mean of MpSAND/MpAPT7/MpAPT3) to normalize MpARF1 expression.
Mp6g02750	MpTIR1	citation background	Auxin receptor not referenced by this token in the paper; Marchantia cited only as the simple one-ARF/one-Aux/IAA comparator system.