Overexpression of isochorismate synthase enhances drought tolerance in barley. 2021

Wenqiang Wang, and Guangqiang Zhang, and Shenlin Yang, and Junyu Zhang, and Yanmei Deng, and Juan Qi, and Jiajie Wu, and Daolin Fu, and Wei Wang, and Qunqun Hao
College of Life Sciences, Zaozhuang University, Zaozhuang, China; State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Taian, Shandong, China; Shandong Shofine Seed Technology Co., Ltd, China. Electronic address: wangwenqiang881202@163.com.

Isochorismate synthase (ICS) is a key enzyme for the synthesis of salicylic acid (SA) in plants. SA mediates plant responses to both biotic and abiotic stresses. In previous studies, we found that overexpression of ICS (ICSOE) or suppression of ICS (ICSRNAi) affected the host response to Fusarium graminearum in barley. However, whether the barley ICS gene plays a role in adapting to abiotic stresses remains to be determined. In the present study, expression of the ICS gene was upregulated when treated with 20 % PEG6000, and ICSOE lines were more drought tolerant than wild type (WT) and ICSRNAi. In addition, the abscisic acid (ABA) levels in the ICSOE lines were higher than those in the WT and ICSRNAi lines under drought stress. High ABA levels significantly reduced Gs and E, which may impact water retention under drought stress. Under drought conditions, the activity of antioxidant enzymes was significantly higher in the ICSOE lines, correlating with a lower levels of reactive oxygen species (ROS) and malondialdehyde (MDA). Enhanced antioxidant competence also contributed to drought tolerance in ICSOE lines. These findings help elucidate the abiotic stress resistance of the ICS pathway in barley.

UI MeSH Term Description Entries
D010940 Plant Proteins Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which PLANT PROTEINS, DIETARY is available. Plant Protein,Protein, Plant,Proteins, Plant
D001467 Hordeum A plant genus of the family POACEAE. The EDIBLE GRAIN, barley, is widely used as food. Barley,Hordeum vulgare
D013312 Stress, Physiological The unfavorable effect of environmental factors (stressors) on the physiological functions of an organism. Prolonged unresolved physiological stress can affect HOMEOSTASIS of the organism, and may lead to damaging or pathological conditions. Biotic Stress,Metabolic Stress,Physiological Stress,Abiotic Stress,Abiotic Stress Reaction,Abiotic Stress Response,Biological Stress,Metabolic Stress Response,Physiological Stress Reaction,Physiological Stress Reactivity,Physiological Stress Response,Abiotic Stress Reactions,Abiotic Stress Responses,Abiotic Stresses,Biological Stresses,Biotic Stresses,Metabolic Stress Responses,Metabolic Stresses,Physiological Stress Reactions,Physiological Stress Responses,Physiological Stresses,Reaction, Abiotic Stress,Reactions, Abiotic Stress,Response, Abiotic Stress,Response, Metabolic Stress,Stress Reaction, Physiological,Stress Response, Metabolic,Stress Response, Physiological,Stress, Abiotic,Stress, Biological,Stress, Biotic,Stress, Metabolic
D055864 Droughts Prolonged dry periods in natural climate cycle. They are slow-onset phenomena caused by rainfall deficit combined with other predisposing factors. Drought
D018506 Gene Expression Regulation, Plant Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action in plants. Plant Gene Expression Regulation,Regulation of Gene Expression, Plant,Regulation, Gene Expression, Plant
D019751 Intramolecular Transferases Enzymes of the isomerase class that catalyze the transfer of acyl-, phospho-, amino- or other groups from one position within a molecule to another. EC 5.4. Mutases,Transferases, Intramolecular
D030821 Plants, Genetically Modified PLANTS, or their progeny, whose GENOME has been altered by GENETIC ENGINEERING. Genetically Modified Plants,Plants, Transgenic,Transgenic Plants,GMO Plants,Genetically Engineered Plants,Engineered Plant, Genetically,Engineered Plants, Genetically,GMO Plant,Genetically Engineered Plant,Genetically Modified Plant,Modified Plant, Genetically,Modified Plants, Genetically,Plant, GMO,Plant, Genetically Engineered,Plant, Genetically Modified,Plant, Transgenic,Plants, GMO,Plants, Genetically Engineered,Transgenic Plant

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