Format

Send to

Choose Destination
Sci Rep. 2018 Jul 4;8(1):10114. doi: 10.1038/s41598-018-28413-x.

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

Author information

1
Department of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea.
2
Institute of Life Science and Natural Resources, Korea University, Seoul, 136-713, Republic of Korea.
3
Crop Breeding Division, National Institute of Crop Science, RDA, 181 Hyeoksin-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 54955, Republic of Korea.
4
Department of Plant Life and Environmental Sciences, Hankyong National University, 327 Jungangro, Anseong, 17579, Republic of Korea.
5
Department of Molecular Biotechnology, College of Agriculture and Life Sciences, Bioenergy Research Center, Chonnam National University, Gwangju, Republic of Korea. sukwhan@chonnam.ac.kr.
6
Department of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea. lhojoung@korea.ac.kr.
7
Institute of Life Science and Natural Resources, Korea University, Seoul, 136-713, Republic of Korea. lhojoung@korea.ac.kr.

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.

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center