The RING Finger E3 Ligase SpRing is a Positive Regulator of Salt Stress Signaling in Salt-Tolerant Wild Tomato Species

Plant & Cell Physiology
Shilian QiXuejun Hua

Abstract

Protein ubiquitination in plants plays critical roles in many biological processes, including adaptation to abiotic stresses. Previously, RING finger E3 ligase has been characterized during salt stress response in several plant species, but little is known about its function in tomato. Here, we report that SpRing, a stress-inducible gene, is involved in salt stress signaling in wild tomato species Solanum pimpinellifolium 'PI365967'. In vitro ubiquitination assay revealed that SpRing is an E3 ubiquitin ligase and the RING finger conserved region is required for its activity. SpRing is expressed in all tissues of wild tomato and up-regulated by salt, drought and osmotic stresses, but repressed by low temperature. Green fluorescent protein (GFP) fusion analysis showed that SpRing is localized at the endoplasmic reticulum. Silencing of SpRing through a virus-induced gene silencing approach led to increased sensitivity to salt stress in wild tomato. Overexpression of SpRing in Arabidopsis thaliana resulted in enhanced salt tolerance during seed germination and early seedling development. The expression levels of certain key stress-related genes are altered both in SpRing-overexpressing Arabidopsis plants and virus-induced gene sile...Continue Reading

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Citations

Nov 30, 2019·Genes·Jinhao SunAnd Minmin Xie
Feb 23, 2020·Plant Signaling & Behavior·Yu LiuJianmei Wang
Oct 3, 2019·International Journal of Molecular Sciences·Liang YangWei Chang
Jun 24, 2017·Plant Biotechnology Journal·Venkatesh P ThirumalaikumarSalma Balazadeh
Jun 27, 2020·Zeitschrift Für Naturforschung. C, a Journal of Biosciences·Hanting ChenYang He
Mar 8, 2021·Plant Physiology and Biochemistry : PPB·Wenqiang WangQunqun Hao

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