A myo-inositol-1-phosphate synthase gene, IbMIPS1, enhances salt and drought tolerance and stem nematode resistance in transgenic sweet potato.

Abstract

Myo-inositol-1-phosphate synthase (MIPS) is a key rate limiting enzyme in myo-inositol biosynthesis. The MIPS gene has been shown to improve tolerance to abiotic stresses in several plant species. However, its role in resistance to biotic stresses has not been reported. In this study, we found that expression of the sweet potato IbMIPS1 gene was induced by NaCl, polyethylene glycol (PEG), abscisic acid (ABA) and stem nematodes. Its overexpression significantly enhanced stem nematode resistance as well as salt and drought tolerance in transgenic sweet potato under field conditions. Transcriptome and real-time quantitative PCR analyses showed that overexpression of IbMIPS1 up-regulated the genes involved in inositol biosynthesis, phosphatidylinositol (PI) and ABA signalling pathways, stress responses, photosynthesis and ROS-scavenging system under salt, drought and stem nematode stresses. Inositol, inositol-1,4,5-trisphosphate (IP3 ), phosphatidic acid (PA), Ca(2+) , ABA, K(+) , proline and trehalose content was significantly increased, whereas malonaldehyde (MDA), Na(+) and H2 O2 content was significantly decreased in the transgenic plants under salt and drought stresses. After stem nematode infection, the significant increase of inositol, IP3 , PA, Ca(2+) , ABA, callose and lignin content and significant reduction of MDA content were found, and a rapid increase of H2 O2 levels was observed, peaked at 1 to 2 days and thereafter declined in the transgenic plants. This study indicates that the IbMIPS1 gene has the potential to be used to improve the resistance to biotic and abiotic stresses in plants.

• Authors: Hong Zhai, Feibing Wang, Zengzhi Si, Jinxi Huo, Lei Xing, Yanyan An, Shaozhen He, Qingchang Liu
• Journal: Plant biotechnology journal (Plant Biotechnol J) Vol. 14 Issue 2 Pg. 592-602 (Feb 2016) ISSN: 1467-7652 [Electronic] England
• PMID: 26011089 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2015 Society for Experimental Biology, Association of Applied Biologists and John Wiley & Sons Ltd.

Chemical References

• Polyethylene Glycols
• Sodium Chloride
• Abscisic Acid
• Myo-Inositol-1-Phosphate Synthase

Topics

• Abscisic Acid (pharmacology)
• Adaptation, Physiological (drug effects, genetics)
• Animals
• Disease Resistance (drug effects)
• Droughts
• Genes, Plant
• Ipomoea batatas (enzymology, genetics, parasitology, physiology)
• Myo-Inositol-1-Phosphate Synthase (genetics, metabolism)
• Nematoda (drug effects, physiology)
• Plant Diseases (parasitology)
• Plant Stems (drug effects, parasitology)
• Plants, Genetically Modified
• Polyethylene Glycols (pharmacology)
• Salt Tolerance (drug effects, genetics)
• Signal Transduction (drug effects)
• Sodium Chloride (pharmacology)
• Stress, Physiological (drug effects)
• Up-Regulation (drug effects, genetics)