Dual role of SND1 facilitates efficient communication between abiotic stress signalling and normal growth in Arabidopsis

Chan Young Jeong, Won Je Lee, Hai An Truong, Cao So N. Trinh, Joo Yeon Jin, Sulhee Kim, Kwang Yeon Hwang, Chon Sik Kang, Joon Kwan Moon, Suk Whan Hong, Hojoung Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Certain plant cells synthesize secondary cell walls besides primary cell walls. This biosynthesis is strictly controlled by an array of transcription factors. Here, we show that SND1, a regulator of cell-wall biosynthesis, regulates abscisic acid (ABA) biosynthesis to ensure optimal plant growth. In Arabidopsis, the lack of SND1 and its homolog NST1 leads to the deficiency of secondary cell walls, preventing snd1nst1 double mutant seedlings from growing upright. Compared to wild type seedlings, the snd1 knockout mutant seedlings accumulated less anthocyanin and exhibited low tolerance to salt stress. Compared to wild type seedlings, the snd1 knockout seedlings were more sensitive to salt stress. Although SND1 can bind to the promoter of Myb46, we observed that SND1 binds directly to the promoter of the ABI4 gene, thereby reducing ABA levels under normal growth conditions. Thus, plants adjust secondary cell wall thickening and growth via SND1. SND1 has a dual function: it activates the Myb46 pathway, fostering lignin biosynthesis to produce sufficient cell wall components for growth, while maintaining a low ABA concentration, as it inhibits growth. This dual function of SND1 may help plants modulate their growth efficiently.

Original languageEnglish
Article number10114
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

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abiotic stress
cell walls
Arabidopsis
seedlings
biosynthesis
abscisic acid
salt stress
promoter regions
knockout mutants
cell wall components
anthocyanins
lignin
transcription factors
plant growth
mutants
genes
cells

ASJC Scopus subject areas

  • General

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Dual role of SND1 facilitates efficient communication between abiotic stress signalling and normal growth in Arabidopsis. / Jeong, Chan Young; Lee, Won Je; Truong, Hai An; Trinh, Cao So N.; Jin, Joo Yeon; Kim, Sulhee; Hwang, Kwang Yeon; Kang, Chon Sik; Moon, Joon Kwan; Hong, Suk Whan; Lee, Hojoung.

In: Scientific Reports, Vol. 8, No. 1, 10114, 01.12.2018.

Research output: Contribution to journalArticle

Jeong, Chan Young ; Lee, Won Je ; Truong, Hai An ; Trinh, Cao So N. ; Jin, Joo Yeon ; Kim, Sulhee ; Hwang, Kwang Yeon ; Kang, Chon Sik ; Moon, Joon Kwan ; Hong, Suk Whan ; Lee, Hojoung. / Dual role of SND1 facilitates efficient communication between abiotic stress signalling and normal growth in Arabidopsis. In: Scientific Reports. 2018 ; Vol. 8, No. 1.
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