Arabinose biosynthesis is critical for salt stress tolerance in Arabidopsis

Bibliographische Detailangaben
Veröffentlicht in:	The New phytologist. - 1979. - 224(2019), 1 vom: 01. Okt., Seite 274-290
1. Verfasser:	Zhao, Chunzhao (VerfasserIn)
Weitere Verfasser:	Zayed, Omar, Zeng, Fansuo, Liu, Chaoxian, Zhang, Ling, Zhu, Peipei, Hsu, Chuan-Chih, Tuncil, Yunus E, Tao, W Andy, Carpita, Nicholas C, Zhu, Jian-Kang
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2019
Zugriff auf das übergeordnete Werk:	The New phytologist
Schlagworte:	Journal Article Research Support, U.S. Gov't, Non-P.H.S. Arabidopsis arabinogalactan protein arabinose cell wall integrity root elongation salt stress Arabidopsis Proteins Mucoproteins mehr... Plant Proteins Protein Isoforms RNA, Messenger arabinogalactan proteins Sodium Chloride 451W47IQ8X Abscisic Acid 72S9A8J5GW Arabinose B40ROO395Z

Beschreibung
Zusammenfassung:	© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust. The capability to maintain cell wall integrity is critical for plants to adapt to unfavourable conditions. l-Arabinose (Ara) is a constituent of several cell wall polysaccharides and many cell wall-localised glycoproteins, but so far the contribution of Ara metabolism to abiotic stress tolerance is still poorly understood. Here, we report that mutations in the MUR4 (also known as HSR8) gene, which is required for the biosynthesis of UDP-Arap in Arabidopsis, led to reduced root elongation under high concentrations of NaCl, KCl, NaNO3 , or KNO3 . The short root phenotype of the mur4/hsr8 mutants under high salinity is rescued by exogenous Ara or gum arabic, a commercial product of arabinogalactan proteins (AGPs) from Acacia senegal. Mutation of the MUR4 gene led to abnormal cell-cell adhesion under salt stress. MUR4 forms either a homodimer or heterodimers with its isoforms. Analysis of the higher order mutants of MUR4 with its three paralogues, MURL, DUR, MEE25, reveals that the paralogues of MUR4 also contribute to the biosynthesis of UDP-Ara and are critical for root elongation. Taken together, our work revealed the importance of the Ara metabolism in salt stress tolerance and also provides new insights into the enzymes involved in the UDP-Ara biosynthesis in plants
Beschreibung:	Date Completed 04.05.2020 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE
ISSN:	1469-8137
DOI:	10.1111/nph.15867