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A NAC Transcription Factor RsSND1 Regulating Secondary Cell Wall Deposition Involves in Fleshy Taproot Formation in Radish (Raphanus sativus L.)
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A NAC Transcription Factor RsSND1 Regulating Secondary Cell Wall Deposition Involves in Fleshy Taproot Formation in Radish (Raphanus sativus L.)
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Journal Article
A NAC Transcription Factor RsSND1 Regulating Secondary Cell Wall Deposition Involves in Fleshy Taproot Formation in Radish (Raphanus sativus L.)
2024
Overview
Cultivated radish (
Raphanus sativus
L.) has fleshy, edible taproot, while wild radish (
Raphanus raphanistrum
L.) has woody, non-edible taproot. Formation of fleshy taproot is the most important landmark event in the evolution and domestication of wild radish to cultivated radish. However, little is known about the molecular mechanisms underlying this process. Histological studies revealed that the decrease of secondary cell wall deposition in the xylem cells was critical for fleshy taproot formation. To find the key genes involved in this process, comparative transcriptome studies were carried out among three fleshy cultivated and one woody wild radish species. We identified 2861 common differentially expressed genes (cDEGs) which were enriched in secondary cell wall biogenesis-related pathways. Moreover, based on the expression profiles, a NAC transcription factor
RsSND1
(Rsa10039519), the first layer master regulator in the biosynthesis of secondary cell wall, was identified and chosen for further analysis. Overexpression of
RsSND1
in
Arabidopsis
led to stunted plant growth, ectopic deposition of secondary wall in parenchymatous cells of xylem, and increased secondary wall thickness of vessels. Moreover, genetic variation analysis of
RsSND1
in 55 natural accessions identified four and two SNPs in exons and downstream regions, respectively, which would be related to fleshy taproot evolution. Together, our results revealed that
RsSND1
regulated deposition of secondary cell wall and involved in fleshy taproot formation.
Publisher
Springer US,Springer Nature B.V
Subject
