scholarly journals Nucleoredoxin Gene TaNRX1 Positively Regulates Drought Tolerance in Transgenic Wheat (Triticum aestivum L.)

2021 ◽  
Vol 12 ◽  
Author(s):  
Yunrui Zhang ◽  
Jianfei Zhou ◽  
Fan Wei ◽  
Tianqi Song ◽  
Yang Yu ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Drought Stress ◽  
Stress Tolerance ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Triticum Aestivum L ◽  
Growth And Yield ◽  
Regulation Mechanism ◽  
Drought Stress Tolerance ◽  
Relative Electrical Conductivity

Drought is the main abiotic stress factor limiting the growth and yield of wheat (Triticum aestivum L.). Therefore, improving wheat tolerance to drought stress is essential for maintaining yield. Previous studies have reported on the important role of TaNRX1 in conferring drought stress tolerance. Therefore, to elucidate the regulation mechanism by which TaNRX1 confers drought resistance in wheat, we generated TaNRX1 overexpression (OE) and RNA interference (RNAi) wheat lines. The results showed that the tolerance of the OE lines to drought stress were significantly enhanced. The survival rate, leaf chlorophyll, proline, soluble sugar content, and activities of the antioxidant enzymes (catalase, superoxide dismutase, and peroxidase) of the OE lines were higher than those of the wild type (WT); however, the relative electrical conductivity and malondialdehyde, hydrogen peroxide, and superoxide anion levels of the OE lines were lower than those of the WT; the RNAi lines showed the opposite results. RNA-seq results showed that the common differentially expressed genes of TaNRX1 OE and RNAi lines, before and after drought stress, were mainly distributed in the plant–pathogen interaction, plant hormone signal transduction, phenylpropane biosynthesis, starch and sucrose metabolism, and carbon metabolism pathways and were related to the transcription factors, including WRKY, MYB, and bHLH families. This study suggests that TaNRX1 positively regulates drought stress tolerance in wheat.

scholarly journals Effect of endophytic Bacillus subtilis on drought stress tolerance of Triticum aestivum L. plants of Steppe Volga and Forest-Steppe West Siberian agroecological groups

2020 ◽  
Author(s):  
O. Lastochkina
Keyword(s):  
Triticum Aestivum ◽  
Bacillus Subtilis ◽  
Drought Stress ◽  
Stress Tolerance ◽  
Water Status ◽  
Physiological Responses ◽  
Triticum Aestivum L ◽  
Forest Steppe ◽  
Drought Stress Tolerance ◽  
Positive Effect

Physiological responses of wheat to B. subtilis under drought depends on the belonging of plants to agroecological groups. B. subtilis showed the best positive effect on growth and water status of Steppe Volga agroecological group’s wheat.

scholarly journals Exogenous Melatonin Modulates the Physiological and Biochemical Mechanisms of Drought Tolerance in Tartary Buckwheat (Fagopyrum tataricum (L.) Gaertn)

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2828
Author(s):  
Md. Shakhawat Hossain ◽  
Jing Li ◽  
Ashim Sikdar ◽  
Mirza Hasanuzzaman ◽  
Ferdinand Uzizerimana ◽  
...  
Keyword(s):  
Drought Stress ◽  
Plant Growth ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Growth And Yield ◽  
Tartary Buckwheat ◽  
Arid Zones ◽  
Enzymatic Antioxidants ◽  
Fagopyrum Tataricum ◽  
Exogenous Melatonin

Tartary buckwheat is one of the nutritious minor cereals and is grown in high-cold mountainous areas of arid and semi-arid zones where drought is a common phenomenon, potentially reducing the growth and yield. Melatonin, which is an amphiphilic low molecular weight compound, has been proven to exert significant effects in plants, under abiotic stresses, but its role in the Tartary buckwheat under drought stress remains unexplored. We evaluated the influence of melatonin supplementation on plant morphology and different physiological activities, to enhance tolerance to posed drought stress by scavenging reactive oxygen species (ROS) and alleviating lipid peroxidation. Drought stress decreased the plant growth and biomass production compared to the control. Drought also decreased Chl a, b, and the Fv/Fm ratio by 54%, 70%, and 8%, respectively, which was associated with the disorganized stomatal properties. Under drought stress, H2O2, O2•−, and malondialdehyde (MDA) contents increased by 2.30, 2.43, and 2.22-folds, respectively, which caused oxidative stress. In contrast, proline and soluble sugar content were increased by 84% and 39%, respectively. However, exogenous melatonin (100 µM) could improve plant growth by preventing ROS-induced oxidative damage by increasing photosynthesis, enzymatic antioxidants (superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase), secondary metabolites like phenylalanine ammonialyase, phenolics, and flavonoids, total antioxidant scavenging (free radical DPPH scavenging), and maintaining relative water content and osmoregulation substances under water stress. Therefore, our study suggested that exogenous melatonin could accelerate drought resistance by enhancing photosynthesis and antioxidant defense in Tartary buckwheat plants.

scholarly journals Drought Stress Tolerance in Wheat and Barley: Advances in Physiology, Breeding and Genetics Research

2019 ◽  
Vol 20 (13) ◽  
pp. 3137 ◽  
Author(s):  
Ahmed Sallam ◽  
Ahmad M. Alqudah ◽  
Mona F. A. Dawood ◽  
P. Stephen Baenziger ◽  
Andreas Börner
Keyword(s):  
Climate Change ◽  
Drought Stress ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Negative Impact ◽  
Genetic Research ◽  
Growth And Yield ◽  
Genetic Constitution ◽  
Drought Stress Tolerance ◽  
Research Areas

Climate change is a major threat to most of the agricultural crops grown in tropical and sub-tropical areas globally. Drought stress is one of the consequences of climate change that has a negative impact on crop growth and yield. In the past, many simulation models were proposed to predict climate change and drought occurrences, and it is extremely important to improve essential crops to meet the challenges of drought stress which limits crop productivity and production. Wheat and barley are among the most common and widely used crops due to their economic and social values. Many parts of the world depend on these two crops for food and feed, and both crops are vulnerable to drought stress. Improving drought stress tolerance is a very challenging task for wheat and barley researchers and more research is needed to better understand this stress. The progress made in understanding drought tolerance is due to advances in three main research areas: physiology, breeding, and genetic research. The physiology research focused on the physiological and biochemical metabolic pathways that plants use when exposed to drought stress. New wheat and barley genotypes having a high degree of drought tolerance are produced through breeding by making crosses from promising drought-tolerant genotypes and selecting among their progeny. Also, identifying genes contributing to drought tolerance is very important. Previous studies showed that drought tolerance is a polygenic trait and genetic constitution will help to dissect the gene network(s) controlling drought tolerance. This review explores the recent advances in these three research areas to improve drought tolerance in wheat and barley.

scholarly journals Physiological regulation of high transpiration efficiency in winter wheat under drought conditions

2010 ◽  
Vol 56 (No. 7) ◽  
pp. 340-347 ◽  
Author(s):  
S. Changhai ◽  
D. Baodi ◽  
Q. Yunzhou ◽  
L. Yuxin ◽  
S. Lei ◽  
...  
Keyword(s):  
Drought Stress ◽  
Winter Wheat ◽  
Stomatal Density ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Triticum Aestivum L ◽  
Transpiration Efficiency ◽  
Photosynthetic Oxygen Evolution ◽  
Physiological Regulation ◽  
Leaf Level

Pot experiments were conducted to study the variation and physiological regulation of transpiration efficiency (TE) of four winter wheat (Triticum aestivum L.) varieties that are widely grown in different ecological regions in North China. Plants were grown under two soil moisture regimes, normal and drought stress. The results showed that under drought stress condition, both TE at plant level and TE at leaf level (TEl) increased significantly. The transpiration rate (Tr) was reduced more strongly than leaf net CO<sub>2</sub> assimilation rate (Pn). The decline of Tr was mainly affected by stomatal conductance and the decline of Pn was affected by non-stomatal factors, which was confirmed by the decline in net photosynthetic oxygen evolution rate. The leaf soluble sugar content and proline content were significantly increased under drought stress. The stomatal density was increased and the stomatal length was reduced. These results led us to make the following conclusions: (1) Under drought stress, the increase in TEl appears to be regulated in two ways: via the stomata by regulating Tr, and independent of the stomata through regulation of Pn; regulation via the stomata was more sensitive; (2) Osmotic adjustment was closely correlated to the non-stomatal regulation, and stomatal aperture was closely correlated to the stomatal way.

scholarly journals Production, Optimization, Characterization and Drought Stress Resistance by β-Glucan-Rich Heteropolysaccharide From an Endophytic Fungi Colletotrichum alatae LCS1 Isolated From Clubmoss (Lycopodium clavatum)

2022 ◽  
Vol 2 ◽  
Author(s):  
Hiran Kanti Santra ◽  
Debdulal Banerjee
Keyword(s):  
Drought Stress ◽  
Stress Tolerance ◽  
Endophytic Fungi ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Production Optimization ◽  
Severe Drought ◽  
Therapeutic Effects ◽  
Lycopodium Clavatum ◽  
First Time

Endophytic entities are ubiquitous in nature with all-square bioactivity ranging from therapeutic effects toward animals to growth promoting attributes and stress tolerance activities in case of green plants. In the present study, the club moss Lycopodium clavatum for the first time has been subjected for the isolation of endophytic fungi. An exopolysaccharide (EPS) extracted from Colletotrichum alatae LCS1, an endophytic fungi isolated from L. clavatum Linn., was characterized as a β-glucan heteropolymer (composed of mannose, rhamnose, arabinose, glucose, galactose, and fucose) which plays a pivotal role in obliterating the drought stress in rice seedlings (Oryza sativa) when applied at an amount of 20, 50, and 100 ppm. The fresh weight contents of rice tissue (39%), total chlorophyll (33%), proline (41%), soluble sugar content (26%) along with antioxidant enzymes such as catalase, peroxidase, and super-oxide dismutase increased (in comparison to control of non-EPS treated seedlings) while malondialdehyde content had reduced markedly after 30 days of regular treatment. The drought resistance of rice seedling was observed at peak when applied at 50 ppm dosage. Vital parameters for EPS production like fermentation duration (5 days), medium pH (6), nutrient (carbon (glucose-7 g%/l), nitrogen (yeast extract-0.4 g%/l), and mineral (NaCl-0.10 g%/l) sources, oxygen requirements (O2 vector or liquid alkane-n-hexane, n-heptane, n-hexadecane), and headspace volume (250 ml Erlenmeyer flask- 50 ml medium, 200 ml-headspace volume) were optimized to obtain an enhanced EPS yield of 17.38 g/L−59% higher than the preoptimized one. The present study, for the first time, reported the β-glucan rich heteropolysaccharide from Colletotrichum origin which is unique in structure and potent in its function of drought stress tolerance and could enhance the sustainable yield of rice cultivation in areas facing severe drought stress.

Assessment of wheat (Triticum aestivum L.) genotypes for high temperature stress tolerance using physico-chemical analysis

2020 ◽  
Vol 53 (2) ◽  
Author(s):  
Khalil Ahmed Laghari ◽  
Abdul Jabbar Pirzada ◽  
Mahboob Ali Sial ◽  
Muhammad Athar Khan ◽  
Jamal Uddin Mangi
Keyword(s):  
Triticum Aestivum ◽  
High Temperature ◽  
Chemical Analysis ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Triticum Aestivum L ◽  
High Temperature Stress ◽  
Physico Chemical
Sign in / Sign up

Export Citation Format

Share Document