Medicago truncatula SOC1 Genes Are Up-regulated by Environmental Cues That Promote Flowering

Frontiers in Plant Science
Jared B FudgeRichard C Macknight

Abstract

Like Arabidopsis thaliana, the flowering of the legume Medicago truncatula is promoted by long day (LD) photoperiod and vernalization. However, there are differences in the molecular mechanisms involved, with orthologs of two key Arabidopsis thaliana regulators, FLOWERING LOCUS C (FLC) and CONSTANS (CO), being absent or not having a role in flowering time function in Medicago. In Arabidopsis, the MADS-box transcription factor gene, SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (AtSOC1), plays a key role in integrating the photoperiodic and vernalization pathways. In this study, we set out to investigate whether the Medicago SOC1 genes play a role in regulating flowering time. Three Medicago SOC1 genes were identified and characterized (MtSOC1a-MtSOC1c). All three MtSOC1 genes, when heterologously expressed, were able to promote earlier flowering of the late-flowering Arabidopsis soc1-2 mutant. The three MtSOC1 genes have different patterns of expression. However, consistent with a potential role in flowering time regulation, all three MtSOC1 genes are expressed in the shoot apex and are up-regulated in the shoot apex of plants in response to LD photoperiods and vernalization. The up-regulation of MtSOC1 genes was reduced in Medica...Continue Reading

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Citations

Jul 10, 2020·Journal of Experimental Botany·Rosa L López-MarquésMichael Palmgren
Oct 9, 2018·Journal of Experimental Botany·Mauren JaudalJoanna Putterill
Jun 2, 2021·Horticulture Research·Dan HouXinchun Lin
Sep 17, 2021·The Plant Journal : for Cell and Molecular Biology·Qiguo SunZhenfei Guo

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Methods Mentioned

BETA
transgenic
genotyping
PCR
restriction digest
RNAseq
RNA Seq

Software Mentioned

GraphPad Prism
MUSCLE
BLASTP
Geneious

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