scholarly journals A review on chitosan: a new solution for combating abiotic stresses in agriculture

2020 ◽  
Vol 7 (2) ◽  
pp. 81-84
Author(s):  
Prajwal P. Dongare ◽  
Prashant R. Shingote ◽  
Narsing D. Parlawar
Keyword(s):  
Abiotic Stresses ◽  
Organic Molecule ◽  
Physiological Responses ◽  
Biochemical Properties ◽  
Wide Spread ◽  
Biotic And Abiotic Stresses ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses ◽  
Naturally Occurring ◽  
Hydrolysis Of

Chitosan is a second most abundant naturally occurring polysaccharide after cellulose derived from chitin which commercially produced from seafood shells, fungi (Aspergillus and mucus) and also from algae by alkaline deacetylation of chitin. It is bio adhesive, biocompatible, biodegradable, organic molecule. Chitosan has wide spread application in agriculture. Chitosan acts as bio-stimulant which upon application to plants stimulates photosynthetic rate, enhances antioxidant production, increases tolerance to biotic and abiotic stresses. Chitosan causes hydrolysis of peptidoglycan of microbes resulting to death of microbes. Recent studies have shown that chitosan induces mechanisms in plants against various biotic and abiotic stresses and helps in formation of barriers that enhances plant's productivity.This paper takes a closer look at the genesis, structural alteration and physiological responses of chitosan foliar applications on plants.As, Abiotic stresses is an important multidimensional environment stresses that damage plant’s physiology, biochemical propertIes and Molecular traits. Chitosan help to combat abiotic and biotic stresses.

scholarly journals Genome-wide analysis of the WRKY gene family in the cucumber genome and transcriptome-wide identification of WRKY transcription factors that respond to biotic and abiotic stresses

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Chunhua Chen ◽  
Xueqian Chen ◽  
Jing Han ◽  
Wenli Lu ◽  
Zhonghai Ren
Keyword(s):  
Transcription Factors ◽  
Plant Growth ◽  
Biotic Stress ◽  
Abiotic Stresses ◽  
Expression Patterns ◽  
Wrky Transcription Factors ◽  
Biotic And Abiotic Stresses ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses ◽  
Cucumber Genome

Abstract Background Cucumber (Cucumis sativus L.) is an economically important vegetable crop species. However, it is susceptible to various abiotic and biotic stresses. WRKY transcription factors play important roles in plant growth and development, particularly in the plant response to biotic and abiotic stresses. However, little is known about the expression pattern of WRKY genes under different stresses in cucumber. Results In the present study, an analysis of the new assembly of the cucumber genome (v3.0) allowed the identification of 61 cucumber WRKY genes. Phylogenetic and synteny analyses were performed using related species to investigate the evolution of the cucumber WRKY genes. The 61 CsWRKYs were classified into three main groups, within which the gene structure and motif compositions were conserved. Tissue expression profiles of the WRKY genes demonstrated that 24 CsWRKY genes showed constitutive expression (FPKM > 1 in all samples), and some WRKY genes showed organ-specific expression, suggesting that these WRKYs might be important for plant growth and organ development in cucumber. Importantly, analysis of the CsWRKY gene expression patterns revealed that five CsWRKY genes strongly responded to both salt and heat stresses, 12 genes were observed to be expressed in response to infection from downy mildew and powdery mildew, and three CsWRKY genes simultaneously responded to all treatments analysed. Some CsWRKY genes were observed to be induced/repressed at different times after abiotic or biotic stress treatment, demonstrating that cucumber WRKY genes might play different roles during different stress responses and that their expression patterns vary in response to stresses. Conclusions Sixty-one WRKY genes were identified in cucumber, and insight into their classification, evolution, and expression patterns was gained in this study. Responses to different abiotic and biotic stresses in cucumber were also investigated. Our results provide a better understanding of the function of CsWRKY genes in improving abiotic and biotic stress resistance in cucumber.

scholarly journals Revisiting and Enlisting Important QTLs Identified in Frech Bean (Phaseolus vulgaris L.): A Review

2020 ◽  
Author(s):  
Sandeep Kaur Dhaliwal ◽  
Pooja Salaria ◽  
Prashant Kaushik
Keyword(s):  
Phaseolus Vulgaris ◽  
Abiotic Stresses ◽  
French Bean ◽  
High Yield ◽  
Progeny Testing ◽  
The Novel ◽  
Phaseolus Vulgaris L ◽  
Biotic And Abiotic Stresses ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses

French bean (Phaseolus vulgaris L.) a member of family Leguminosae is a useful source of protein (∼22%), minerals (folate), vitamins and fibre. Abiotic and biotic stresses are the constraints to high yield and production of French bean. Varieties reluctant to diseases as well as abiotic stresses is among the top breeding objectives for the French bean. Mendelian ratios could know the genetically reliable forms of resistance, whereas it's more robust to understand the intricate kinds, often referred to as quantitative trait loci (QTL). Here, we review and compile the information from the studies related to the identification of QTLs for critical biofortification traits, biotic and abiotic stresses in French bean. Successful map-based cloning requires QTLs represent single genes which could be isolated in near-isogenic lines, and also the genotypes could be unambiguously inferred by progeny testing. Overall, this information will be useful for directing the French bean breeders to select a suitable method for the inheritance evaluation of quantitative traits and determining the novel genes in germplasm resources to ensure that much more potential of genetic information may be uncovered.

scholarly journals Genome-wide analysis of the WRKY gene family in the cucumber genome and transcriptome‑wide identification of WRKY transcription factors that respond to biotic and abiotic stresses

2020 ◽  
Author(s):  
Chunhua Chen ◽  
Xueqian Chen ◽  
Jing Han ◽  
Wenli Lu ◽  
Zhonghai Ren
Keyword(s):  
Transcription Factors ◽  
Plant Growth ◽  
Biotic Stress ◽  
Abiotic Stresses ◽  
Expression Patterns ◽  
Wrky Transcription Factors ◽  
Biotic And Abiotic Stresses ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses ◽  
Cucumber Genome

Abstract Background: Cucumber ( Cucumis sativus L.) is an economically important vegetable crop species. However, it is susceptible to various abiotic and biotic stresses. WRKY transcription factors play important roles in plant growth and development, particularly in the plant response to biotic and abiotic stresses. However, little is known about the expression pattern of WRKY genes under different stresses in cucumber. Results: In the present study, an analysis of the new assembly of the cucumber genome (v3.0) allowed the identification of 61 cucumber WRKY genes. Phylogenetic and synteny analyses were performed using related species to investigate the evolution of the cucumber WRKY genes. The 61 CsWRKYs were classified into three main groups, within which the gene structure and motif compositions were conserved. Tissue expression profiles of the WRKY genes demonstrated that 24 CsWRKY genes showed constitutive expression (FPKM > 1 in all samples), and some WRKY genes showed organ-specific expression, suggesting that these WRKYs might be important for plant growth and organ development in cucumber. Importantly, analysis of the CsWRKY gene expression patterns revealed that 7 CsWRKY genes strongly responded to both salt and heat stresses, 12 genes were observed to be expressed in response to infection from downy mildew and powdery mildew, and three CsWRKY genes simultaneously responded to all treatments analysed. Some CsWRKY genes were observed to be induced/repressed at different times after abiotic or biotic stress treatment, demonstrating that cucumber WRKY genes might play different roles during different stress responses and that their expression patterns vary in response to stresses. Conclusions: Sixty-one WRKY genes were identified in cucumber, and insight into their classification, evolution, and expression patterns was gained in this study. Responses to different abiotic and biotic stresses in cucumber were also investigated. Our results provide a better understanding of the function of Cs WRKY genes in improving abiotic and biotic stress resistance in cucumber.

scholarly journals Breeding for Early Flowering in Chickpea (Cicer arietinum L.) – A Key Strategy to Accelerate Chickpea Productivity: A Review

2020 ◽  
pp. 271-285
Author(s):  
Aswini Nunavath ◽  
K. Gopala Krishna Murthy ◽  
Venkatraman Hegde ◽  
S. Madhusudan Reddy
Keyword(s):  
Heat Stress ◽  
Abiotic Stresses ◽  
Early Flowering ◽  
Biotic And Abiotic Stresses ◽  
Abiotic And Biotic Stresses ◽  
Tropical Regions ◽  
Biotic Stresses ◽  
Early Maturing ◽  
Drought And Heat Stress ◽  
100 Seed Weight

Chickpea is one of the most important pulse crop cultivated across the globe which is conventionally a low-input crop that is being cultivated mostly in moisture deficient rainfed environments during post-rainy season. The crop is being severely affected with various biotic and abiotic stresses among which, drought and heat stress are considered as serious constraints limiting chickpea productivity in sub-tropical regions. Several strategies were adopted to enhance the productivity under drought and heat stress environments among which, the development of early flowering varieties is one of the key strategies gaining importance in recent past. Some of the early / super early varieties like ICCV 2, JG 11, JG 14, KAK 2, JAKI 9218, ICCV 96029 and ICCV 96030 were developed during the last three decades. One of the most significant milestones in breeding for early varieties is the identification of four genes efl-1, efl-2, efl-3 and efl-4 governing early flowering by using various lines viz., ICCV 2, ICCV 96029, ICC 5810, BGD 132 and ICC 16641. Several QTLs controlling time of flowering were also mapped on linkage groups LG1, LG2, LG3, LG4, LG5, LG6 and LG8. The information on inheritance of time of flowering, correlation between early flowering with other yield attributing traits like number of pods per plant, number of seeds per pod, seed size, 100-seed weight, identified QTLs for early flowering and abiotic and biotic stresses tolerance may be useful for developing early maturing varieties that posses tolerance to various abiotic stresses by using different conventional and biotechnological approaches.

scholarly journals Potential applications of biogenic selenium nanoparticles in alleviating biotic and abiotic stresses in plants: A comprehensive insight on the mechanistic approach and future perspectives

2021 ◽  
Vol 10 (1) ◽  
pp. 456-475
Author(s):  
Efat Zohra ◽  
Muhammad Ikram ◽  
Ahmad A. Omar ◽  
Mujahid Hussain ◽  
Seema Hassan Satti ◽  
...  
Keyword(s):  
Abiotic Stresses ◽  
Crop Production ◽  
Plant Secondary Metabolites ◽  
Selenium Nanoparticles ◽  
Future Research ◽  
Biotic And Abiotic Stresses ◽  
Biotic Stresses ◽  
Agriculture Sector ◽  
Developmental Growth ◽  
Potential Applications

Abstract In the present era, due to the increasing incidence of environmental stresses worldwide, the developmental growth and production of agriculture crops may be restrained. Selenium nanoparticles (SeNPs) have precedence over other nanoparticles because of the significant role of selenium in activating the defense system of plants. In addition to beneficial microorganisms, the use of biogenic SeNPs is known as an environmentally friendly and ecologically biocompatible approach to enhance crop production by alleviating biotic and abiotic stresses. This review provides the latest development in the green synthesis of SeNPs by using the results of plant secondary metabolites in the biogenesis of nanoparticles of different shapes and sizes with unique morphologies. Unfortunately, green synthesized SeNPs failed to achieve significant attention in the agriculture sector. However, research studies were performed to explore the application potential of plant-based SeNPs in alleviating drought, salinity, heavy metal, heat stresses, and bacterial and fungal diseases in plants. This review also explains the mechanistic actions that the biogenic SeNPs acquire to alleviate biotic and abiotic stresses in plants. In this review article, the future research that needs to use plant-mediated SeNPs under the conditions of abiotic and biotic stresses are also highlighted.

scholarly journals Exploiting Beneficial Pseudomonas spp. for Cannabis Production

2022 ◽  
Vol 12 ◽  
Author(s):  
Carole Balthazar ◽  
David L. Joly ◽  
Martin Filion
Keyword(s):  
Plant Growth ◽  
Environmental Sustainability ◽  
Cannabis Sativa ◽  
Production Systems ◽  
Growth Promotion ◽  
Production Costs ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses ◽  
Naturally Occurring ◽  
The Many

Among the oldest domesticated crops, cannabis plants (Cannabis sativa L., marijuana and hemp) have been used to produce food, fiber, and drugs for thousands of years. With the ongoing legalization of cannabis in several jurisdictions worldwide, a new high-value market is emerging for the supply of marijuana and hemp products. This creates unprecedented challenges to achieve better yields and environmental sustainability, while lowering production costs. In this review, we discuss the opportunities and challenges pertaining to the use of beneficial Pseudomonas spp. bacteria as crop inoculants to improve productivity. The prevalence and diversity of naturally occurring Pseudomonas strains within the cannabis microbiome is overviewed, followed by their potential mechanisms involved in plant growth promotion and tolerance to abiotic and biotic stresses. Emphasis is placed on specific aspects relevant for hemp and marijuana crops in various production systems. Finally, factors likely to influence inoculant efficacy are provided, along with strategies to identify promising strains, overcome commercialization bottlenecks, and design adapted formulations. This work aims at supporting the development of the cannabis industry in a sustainable way, by exploiting the many beneficial attributes of Pseudomonas spp.

scholarly journals Induced Genetic Variations in Fruit Trees Using New Breeding Tools: Food Security and Climate Resilience

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1347
Author(s):  
Muhammad Naeem Sattar ◽  
Zafar Iqbal ◽  
Jameel M. Al-Khayri ◽  
S. Mohan Jain
Keyword(s):  
Abiotic Stresses ◽  
Wood Quality ◽  
Fruit Trees ◽  
Mutation Breeding ◽  
Parthenocarpic Fruit ◽  
Biotic And Abiotic Stresses ◽  
Biotic Stresses ◽  
Climate Resilience ◽  
Technological Advances ◽  
Physical And Chemical

Fruit trees provide essential nutrients to humans by contributing to major agricultural outputs and economic growth globally. However, major constraints to sustainable agricultural productivity are the uncontrolled proliferation of the population, and biotic and abiotic stresses. Tree mutation breeding has been substantially improved using different physical and chemical mutagens. Nonetheless, tree plant breeding has certain crucial bottlenecks including a long life cycle, ploidy level, occurrence of sequence polymorphisms, nature of parthenocarpic fruit development and linkage. Genetic engineering of trees has focused on boosting quality traits such as productivity, wood quality, and resistance to biotic and abiotic stresses. Recent technological advances in genome editing provide a unique opportunity for the genetic improvement of woody plants. This review examines application of the CRISPR-Cas system to reduce disease susceptibility, alter plant architecture, enhance fruit quality, and improve yields. Examples are discussed of the contemporary CRISPR-Cas system to engineer easily scorable PDS genes, modify lignin, and to alter the flowering onset, fertility, tree architecture and certain biotic stresses.

scholarly journals Combined Abiotic Stresses Repress Defense and Cell Wall Metabolic Genes and Render Plants More Susceptible to Pathogen Infection

Plants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1946
Author(s):  
Nasser Sewelam ◽  
Mohamed El-Shetehy ◽  
Felix Mauch ◽  
Veronica G. Maurino
Keyword(s):  
Cell Wall ◽  
Heat Stress ◽  
Disease Resistance ◽  
Pseudomonas Syringae ◽  
Plant Disease Resistance ◽  
Abiotic Stresses ◽  
Defense Genes ◽  
Pathogen Infection ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses

Plants are frequently exposed to simultaneous abiotic and biotic stresses, a condition that induces complex responses, negatively affects crop productivity and is becoming more exacerbated with current climate change. In this study, we investigated the effects of individual and combined heat and osmotic stresses on Arabidopsis susceptibility to the biotrophic pathogen Pseudomonas syringae pv. tomato (Pst) and the necrotrophic pathogen Botrytiscinerea (Bc). Our data showed that combined abiotic and biotic stresses caused an enhanced negative impact on plant disease resistance in comparison with individual Pst and Bc infections. Pretreating plants with individual heat or combined osmotic-heat stress strongly reduced the expression of many defense genes including pathogenesis-related proteins (PR-1 and PR-5) and the TN-13 gene encoding the TIR-NBS protein, which are involved in disease resistance towards Pst. We also found that combined osmotic-heat stress caused high plant susceptibility to Bc infection and reduced expression of a number of defense genes, including PLANT DEFENSIN 1.3 (PDF1.3), BOTRYTIS SUSCEPTIBLE 1 (BOS1) and THIONIN 2.2 (THI2.2) genes, which are important for disease resistance towards Bc. The impaired disease resistance against both Pst and Bc under combined abiotic stress is associated with reduced expression of cell wall-related genes. Taken together, our data emphasize that the combination of global warming-associated abiotic stresses such as heat and osmotic stresses makes plants more susceptible to pathogen infection, thus threatening future global food security.

scholarly journals Small RNA Mobility: Spread of RNA Silencing Effectors and its Effect on Developmental Processes and Stress Adaptation in Plants

2019 ◽  
Vol 20 (17) ◽  
pp. 4306 ◽  
Author(s):  
Chiara Pagliarani ◽  
Giorgio Gambino
Keyword(s):  
Small Rnas ◽  
Rna Silencing ◽  
Physiological Responses ◽  
Noncoding Rnas ◽  
Environmental Cues ◽  
Physiological Changes ◽  
Abiotic And Biotic Stresses ◽  
Biotic Stresses ◽  
Small Noncoding Rnas ◽  
Surrounding Environment

Plants are exposed every day to multiple environmental cues, and tight transcriptome reprogramming is necessary to control the balance between responses to stress and processes of plant growth. In this context, the silencing phenomena mediated by small RNAs can drive transcriptional and epigenetic regulatory modifications, in turn shaping plant development and adaptation to the surrounding environment. Mounting experimental evidence has recently pointed to small noncoding RNAs as fundamental players in molecular signalling cascades activated upon exposure to abiotic and biotic stresses. Although, in the last decade, studies on stress responsive small RNAs increased significantly in many plant species, the physiological responses triggered by these molecules in the presence of environmental stresses need to be further explored. It is noteworthy that small RNAs can move either cell-to-cell or systemically, thus acting as mobile silencing effectors within the plant. This aspect has great importance when physiological changes, as well as epigenetic regulatory marks, are inspected in light of plant environmental adaptation. In this review, we provide an overview of the categories of mobile small RNAs in plants, particularly focusing on the biological implications of non-cell autonomous RNA silencing in the stress adaptive response and epigenetic modifications.

scholarly journals Regulatory Network Identification, Promoter and Expression Analysis of Arabidopsis thaliana NPR1 in Defense Responses against Stresses

2018 ◽  
Vol 10 (3) ◽  
pp. 333-339
Author(s):  
Amir G. SHAHRIARI ◽  
Aminallah TAHMASEBI ◽  
Sima SAZEGARI
Keyword(s):  
Arabidopsis Thaliana ◽  
Stress Responses ◽  
Abiotic Stresses ◽  
Defense Responses ◽  
Wrky Transcription Factor ◽  
Microarray Data Analysis ◽  
Common Element ◽  
Biotic And Abiotic Stresses ◽  
Promoter Regions ◽  
Biotic Stresses

Salicylic acid (SA) and jasmonic acid (JA) phytohormones have been known for their roles in plant defense behaviour against biotic and abiotic stresses. They regulate defense pathways by antagonistic interaction. NPR1 as a key regulatory factor in the cross-talk between SA and JA, signaling is essential for the inhibition of JA-responsive gene expression by SA. In silico promoter analysis of 1.5 kb promoter regions of NPR1 gene revealed that NPR1 contains 23 MYB and 20 WRKY transcription factor binding sites. Different cis-elements associated with various stress responses were identified in Arabidopsis thaliana NPR1. The most common element was allocated to the defense responses against biotic stresses. Based on gene network analysis, NPR1, TGA2 and TGA3 were predicted to have functional cooperation with each other. Affymetrix microarray data analysis of A. thaliana under SA treatment demonstrated that most genes involved in NPR1 network are up-regulated under SA treatment. Therefore, interaction and cooperation between these factors might serve to fine-tune regulation of defense and immune responses against biotic and abiotic stresses.  

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