scholarly journals AnDHN, a Dehydrin Protein From Ammopiptanthus nanus, Mitigates the Negative Effects of Drought Stress in Plants

2021 ◽  
Vol 12 ◽  
Author(s):  
Yibo Sun ◽  
Linghao Liu ◽  
Shaokun Sun ◽  
Wangzhen Han ◽  
Muhammad Irfan ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Germination Rate ◽  
Root System Architecture ◽  
Ros Scavenging ◽  
Negative Effects ◽  
Ammopiptanthus Nanus ◽  
Transgenic Lines ◽  
Effects Of Drought

Dehydrins (DHNs) play crucial roles in a broad spectrum of abiotic stresses in model plants. However, the evolutionary role of DHNs has not been explored, and the function of DHN proteins is largely unknown in Ammopiptanthus nanus (A. nanus), an ancient and endangered legume species from the deserts of northwestern China. In this study, we isolated a drought-response gene (c195333_g1_i1) from a drought-induced RNA-seq library of A. nanus. Evolutionary bioinformatics showed that c195333_g1_i1 is an ortholog of Arabidopsis DHN, and we renamed it AnDHN. Moreover, DHN proteins may define a class of proteins that are evolutionarily conserved in all angiosperms that have experienced a contraction during the evolution of legumes. Arabidopsis plants overexpressing AnDHN exhibited morpho-physiological changes, such as an increased germination rate, higher relative water content (RWC), higher proline (PRO) content, increased peroxidase (POD) and catalase (CAT) activities, lower contents of malondialdehyde (MDA), H2O2 and O2–, and longer root length. Our results showed that the transgenic lines had improved drought resistance with deep root system architecture, excellent water retention, increased osmotic adjustment, and enhanced reactive oxygen species (ROS) scavenging. Furthermore, the transgenic lines also had enhanced salt and cold tolerance. Our findings demonstrate that AnDHN may be a good candidate gene for improving abiotic stress tolerance in crops.Key Message: Using transcriptome analysis in Ammopiptanthus nanus, we isolated a drought-responsive gene, AnDHN, that plays a key role in enhancing abiotic stress tolerance in plants, with strong functional diversification in legumes.

scholarly journals Down-Regulation of SlGRAS10 in Tomato Confers Abiotic Stress Tolerance

Genes ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 623
Author(s):  
Sidra Habib ◽  
Yee Yee Lwin ◽  
Ning Li
Keyword(s):  
Salt Stress ◽  
Abiotic Stress ◽  
Plant Growth ◽  
Stress Tolerance ◽  
Abiotic Stresses ◽  
Abiotic Stress Tolerance ◽  
Functional Characterization ◽  
Flavonoid Biosynthesis ◽  
Ros Scavenging ◽  
Down Regulation

Adverse environmental factors like salt stress, drought, and extreme temperatures, cause damage to plant growth, development, and crop yield. GRAS transcription factors (TFs) have numerous functions in biological processes. Some studies have reported that the GRAS protein family plays significant functions in plant growth and development under abiotic stresses. In this study, we demonstrated the functional characterization of a tomato SlGRAS10 gene under abiotic stresses such as salt stress and drought. Down-regulation of SlGRAS10 by RNA interference (RNAi) produced dwarf plants with smaller leaves, internode lengths, and enhanced flavonoid accumulation. We studied the effects of abiotic stresses on RNAi and wild-type (WT) plants. Moreover, SlGRAS10-RNAi plants were more tolerant to abiotic stresses (salt, drought, and Abscisic acid) than the WT plants. Down-regulation of SlGRAS10 significantly enhanced the expressions of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) to reduce the effects of reactive oxygen species (ROS) such as O2− and H2O2. Malondialdehyde (MDA) and proline contents were remarkably high in SlGRAS10-RNAi plants. Furthermore, the expression levels of chlorophyll biosynthesis, flavonoid biosynthesis, and stress-related genes were also enhanced under abiotic stress conditions. Collectively, our conclusions emphasized the significant function of SlGRAS10 as a stress tolerate transcription factor in a certain variety of abiotic stress tolerance by enhancing osmotic potential, flavonoid biosynthesis, and ROS scavenging system in the tomato plant.

scholarly journals Clustered metallothionein genes are co-regulated in rice and ectopic expression of OsMT1e-P confers multiple abiotic stress tolerance in tobacco via ROS scavenging

2012 ◽  
Vol 12 (1) ◽  
pp. 107 ◽  
Author(s):  
Gautam Kumar ◽  
Hemant Kushwaha ◽  
Vaishali Panjabi-Sabharwal ◽  
Sumita Kumari ◽  
Rohit Joshi ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Ectopic Expression ◽  
Ros Scavenging

scholarly journals Genome-wide analysis of Myo-inositol oxygenase gene family in tomato reveals their involvement in ascorbic acid accumulation

2019 ◽  
Author(s):  
Shoaib Munir ◽  
Muhammad Ali Mumtaz ◽  
John Kojo Ahiakpa ◽  
Genzhong Liu ◽  
Wei Zheng ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Abiotic Stress ◽  
Gene Family ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Light Response ◽  
Genome Wide ◽  
Genes Encoding ◽  
Transgenic Lines ◽  
Distribution Mapping

Abstract Background Ascorbic acid (Vitamin C, AsA) is an antioxidant metabolite involved in plant development and environmental stimuli. AsA biosynthesis has been well studied in plants and MIOX is a critical enzyme in plants AsA biosynthesis pathway. However, myo-inositol oxygenase (MIOX) gene family members and their involvement in AsA biosynthesis and response to abiotic stress remain unclear. Results In this study, five tomato genes encoding MIOX proteins and possessing MIOX motifs were identified. Structural analysis and distribution mapping showed that 5 MIOX genes contain different intron/exon patterns and unevenly distributed among four chromosomes. In addition, expression analyses indicated the remarkable expression of SlMIOX genes in different plant tissues. Furthermore, transgenic lines were obtained by over-expression of MIOX4 gene in tomato. The overexpression lines showed a significant increase in total ascorbate in leaves and red fruits compared to control. Expression analysis revealed that increased accumulation of AsA in MIOX4 overexpression lines is possible as a consequence of the multiple genes involved in AsA biosynthesis. Myo inositol (MI) feeding in leaf and fruit implied that AsA biosynthesis was mainly improved by Myo-inositol pathway in leaves and fruits. MIOX4 overexpression lines exhibited a betterlight response, abiotic stress tolerance, and AsA biosynthesis capacity. Conclusions These results showed that MIOX4 transgenic lines contribute to AsA biosynthesis, evident as better light response and improved oxidative stress tolerance. This study provides the first comprehensive analysis of MIOX gene family and their involvement in ascorbate biosynthesis in tomato.

scholarly journals The SbMT-2 Gene from a Halophyte Confers Abiotic Stress Tolerance and Modulates ROS Scavenging in Transgenic Tobacco

PLoS ONE ◽  
2014 ◽  
Vol 9 (10) ◽  
pp. e111379 ◽  
Author(s):  
Amit Kumar Chaturvedi ◽  
Manish Kumar Patel ◽  
Avinash Mishra ◽  
Vivekanand Tiwari ◽  
Bhavanath Jha
Keyword(s):  
Abiotic Stress ◽  
Stress Tolerance ◽  
Transgenic Tobacco ◽  
Abiotic Stress Tolerance ◽  
Ros Scavenging

scholarly journals Genome-wide analysis of Myo-inositol oxygenase gene family in tomato reveals their involvement in ascorbic acid accumulation

2020 ◽  
Author(s):  
Shoaib Munir ◽  
Muhammad Ali Mumtaz ◽  
John Kojo Ahiakpa ◽  
Genzhong Liu ◽  
Weifang Chen ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Abiotic Stress ◽  
Gene Family ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Light Response ◽  
Genome Wide ◽  
Genes Encoding ◽  
Transgenic Lines ◽  
Distribution Mapping

Abstract Background Ascorbic acid (Vitamin C, AsA) is an antioxidant metabolite involved in plant development and environmental stimuli. AsA biosynthesis has been well studied in plants, and MIOX is a critical enzyme in plants AsA biosynthesis pathway. However, Myo-inositol oxygenase (MIOX) gene family members and their involvement in AsA biosynthesis and response to abiotic stress remain unclear. Results In this study, five tomato genes encoding MIOX proteins and possessing MIOX motifs were identified. Structural analysis and distribution mapping showed that 5 MIOX genes contain different intron/exon patterns and unevenly distributed among four chromosomes. Besides, expression analyses indicated the remarkable expression of SlMIOX genes in different plant tissues. Furthermore, transgenic lines were obtained by over-expression of the MIOX4 gene in tomato. The overexpression lines showed a significant increase in total ascorbate in leaves and red fruits compared to control. Expression analysis revealed that increased accumulation of AsA in MIOX4 overexpression lines is possible as a consequence of the multiple genes involved in AsA biosynthesis. Myo inositol (MI) feeding in leaf and fruit implied that the Myo-inositol pathway improved the AsA biosynthesis in leaves and fruits. MIOX4 overexpression lines exhibited abetter light response, abiotic stress tolerance, and AsA biosynthesis capacity. Conclusions These results showed that MIOX4 transgenic lines contribute to AsA biosynthesis, evident as better light response and improved oxidative stress tolerance. This study provides the first comprehensive analysis of the MIOX gene family and their involvement in ascorbate biosynthesis in tomato.

scholarly journals Genome-wide analysis of Myo-inositol oxygenase gene family in tomato reveals their involvement in ascorbic acid accumulation

2020 ◽  
Author(s):  
Shoaib Munir ◽  
Muhammad Ali Mumtaz ◽  
John Kojo Ahiakpa ◽  
Genzhong Liu ◽  
Wei Zheng ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Abiotic Stress ◽  
Gene Family ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Light Response ◽  
Genome Wide ◽  
Genes Encoding ◽  
Transgenic Lines ◽  
Distribution Mapping

Abstract Background: Ascorbic acid (Vitamin C, AsA) is an antioxidant metabolite involved in plant development and environmental stimuli. AsA biosynthesis has been well studied in plants, and MIOX is a critical enzyme in plants AsA biosynthesis pathway. However, Myo-inositol oxygenase (MIOX) gene family members and their involvement in AsA biosynthesis and response to abiotic stress remain unclear. Results : In this study, five tomato genes encoding MIOX proteins and possessing MIOX motifs were identified. Structural analysis and distribution mapping showed that 5 MIOX genes contain different intron/exon patterns and unevenly distributed among four chromosomes. Besides, expression analyses indicated the remarkable expression of SlMIOX genes in different plant tissues. Furthermore, transgenic lines were obtained by over-expression of the MIOX4 gene in tomato. The overexpression lines showed a significant increase in total ascorbate in leaves and red fruits compared to control. Expression analysis revealed that increased accumulation of AsA in MIOX4 overexpression lines is possible as a consequence of the multiple genes involved in AsA biosynthesis. Myo inositol (MI) feeding in leaf and fruit implied that the Myo-inositol pathway improved the AsA biosynthesis in leaves and fruits. MIOX4 overexpression lines exhibited a better light response, abiotic stress tolerance, and AsA biosynthesis capacity. Conclusions: These results showed that MIOX4 transgenic lines contribute to AsA biosynthesis, evident as better light response and improved oxidative stress tolerance. This study provides the first comprehensive analysis of the MIOX gene family and their involvement in ascorbate biosynthesis in tomato.

Characterization of the Hippophae rhamnoides WRKY gene family and functional analysis of the role of the HrWRKY21 gene in resistance to abiotic stresses

Genome ◽  
2019 ◽  
Vol 62 (10) ◽  
pp. 689-703
Author(s):  
Zhaoyu Wang ◽  
Runxia Feng ◽  
Xue Zhang ◽  
Zhi Su ◽  
Jianrong Wei ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Stress Tolerance ◽  
Molecular Mechanisms ◽  
Abiotic Stress Tolerance ◽  
Hippophae Rhamnoides ◽  
Lower Percentage ◽  
Ecological Value ◽  
Surface Areas ◽  
Hippophaë Rhamnoides ◽  
Transgenic Lines

Sea buckthorn (Hippophae rhamnoides L.) is a plant with economic and ecological value. It is uniquely capable of growing well under salt and drought stress. WRKY transcription factors play important roles in the ability of plants to resist stress. In this study, 48 HrWRKY genes were identified based on RNA sequencing of H. rhamnoides. Evaluation of expression pattern of HrWRKY1, HrWRKY17, HrWRKY18, HrWRKY21, HrWRKY33-2, HrWRKY40-2, HrWRKY41, and HrWRKY71 suggested that they were involved in abiotic stress. Interestingly, HrWRKY21, one of eight HrWRKY genes, was a positive regulator of abiotic stress tolerance in H. rhamnoides. In addition, most morphological attributes of roots in transgenic Nicotiana tabacum lines (overexpressing HrWRKY21) were also markedly increased compared with the wild-type (WT), including total lengths, specific root lengths, and surface areas. Stress tolerance of transgenic lines was also correlated with higher antioxidant activity (SOD and POD), lower percentage of relative conductivity (REC), and lower activity of malondialdehyde (MDA) under stress conditions. These findings represent a foundation of knowledge about the molecular mechanisms driving resistance to adverse conditions in plants; they are a promising step towards development of tree cultivars with improved tolerance to abiotic stress.

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