scholarly journals Salinity stress effects on the growth, morphological, physiological, and biochemical properties of Melia (Melia dubia Cav.) plant

Dendrobiology ◽  
2021 ◽  
Vol 86 ◽  
pp. 56-68
Author(s):  
Raj Kumar ◽  
Rakesh Banyal ◽  
Awtar Singh ◽  
Rajender Kumar Yadav ◽  
Parbodh Chander Sharma
Keyword(s):  
Growth Rate ◽  
Salt Stress ◽  
Salinity Stress ◽  
Soil Salinity ◽  
Tree Species ◽  
Indian Subcontinent ◽  
Ion Homeostasis ◽  
Stress Conditions ◽  
Saline Stress ◽  
Melia Dubia

Salinity stress severely affects the growth, physiological and developmental processes in plant species. Melia dubia is an ecologically and economically important tree species of the Indian subcontinent. However, systematic information with respect to the species salt tolerance potential is completely lacking. Under salt stress conditions, determining suitable soil EC range is required for the better survival, growth and productivity of the tree species. In present study, we investigated the effects of different soil salinity (EC 4, 8, and 12) levels on the ion homeostasis, physio-biochemistry, morphology, and growth of M. dubia plant. Results revealed that increase in soil salinity causes higher Na+ content and Na+/K+ ratio, while lower K+ content, in the leaf tissues of M. dubia. The physiological processes such as the photosynthetic rate, stomatal conductance, internal CO2 concentration, and transpiration rate were adversely affected with the increased salt stress levels. Morphological parameters, such as internodal length, petiole length, leaf length, and leaf width also decreased (P<0.05) under saline stress conditions. Results further indicated that salinity levels significantly (P<0.05) affected the M. dubia growth, and the growth rate was found optimum upto 8 EC, thereafter it slightly decreased with the increased salt stress to 12 EC. Our findings showed that increased salinity stress causes significant changes in the physiological, morphological, and growth pattern of M. dubia. Therefore, based on present experiment, we found M. dubia suitable for the salt affected soils of EC 8 with optimum growth rate and at EC 12 with the moderate (20–25%) growth reduction.

Effects of arbuscular mycorrhizal fungi on photosynthesis and chlorophyll fluorescence of maize seedlings under salt stress

2018 ◽  
pp. 199 ◽  
Author(s):  
Hongwen Xu, Yan Lu ◽  
Shuyuan Tong
Keyword(s):  
Salt Stress ◽  
Arbuscular Mycorrhizal Fungi ◽  
Leaf Area ◽  
Salinity Stress ◽  
Mycorrhizal Fungi ◽  
Photosynthetic Capacity ◽  
Arbuscular Mycorrhizal ◽  
Dry Mass ◽  
Saline Stress ◽  
Rubisco Activity

The impact of arbuscular mycorrhizal fungi (AMF) Glomus. tortuosum on morphology, photosynthetic pigments, chlorophyll (Chl) fluorescence, photosynthetic capacity and rubisco activity of maize under saline stress were detected under potted culture experiments. The experimental result indicated the saline stress notably reduced both dry mass and leaf area in contrast with the control treatment. Nevertheless, AMF remarkably ameliorated dry mass and leaf area under saline stress environment. Besides, maize plants appeared to have high dependency on AMF which improved physiological mechanisms by raising chlorophyll content, efficiency of light energy utilization, gas exchange and rubisco activity under salinity stress. In conclusion, AM could mitigate the growth limitations caused by salinity stress, and hence play a very important role in promoting photosynthetic capacity under salt stress in maize.

scholarly journals Potasssium chloride as a nutrient seed primer to enhance salt‑tolerance in maize

2012 ◽  
Vol 47 (8) ◽  
pp. 1181-1184 ◽  
Author(s):  
Badar‑uz‑Zaman ◽  
Arshad Ali ◽  
Syed Ishtiaq Hyder ◽  
Muhammad Arshadullah ◽  
Saqib Umar Bhatti
Keyword(s):  
Salt Stress ◽  
Salinity Stress ◽  
Dry Matter ◽  
Germination Rate ◽  
Seed Priming ◽  
Germination Percentage ◽  
Stress Conditions ◽  
Maize Crop ◽  
Mean Germination Time ◽  
Muriate Of Potash

The objective of this work was to determine if KCl could be a useful nutrient primer for safe seed germination in maize crop under salt stress conditions. Seed priming was done using 50 mmol L‑1 of muriate of potash, and germination and seedling growth were evaluated after salt stress with NaCl up to 50 mmol L‑1. Another set of seeds was tested under the same salt stress conditions without priming. Under salinity stress, germination percentage, germination rate index, germination coefficient, and seedling vigor indexes were higher in primed seeds. In unprimed seeds, mean germination time increased, while the germination rate index and the fresh and dry matter mass decreased more sharply with salinity stress. The Na/K ratio was higher in unprimed seeds.

scholarly journals The Importance of Non-diffusional Factors in Determining Photosynthesis of Two Contrasting Quinoa Ecotypes (Chenopodium quinoa Willd.) Subjected to Salinity Conditions

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 927
Author(s):  
José Delatorre-Herrera ◽  
Karina B. Ruiz ◽  
Manuel Pinto
Keyword(s):  
Salt Stress ◽  
High Salinity ◽  
Photosynthetic Capacity ◽  
Chenopodium Quinoa ◽  
Co2 Assimilation ◽  
Stress Conditions ◽  
Saline Stress ◽  
Salt Treatment ◽  
Broad Distribution ◽  
Bisphosphate Carboxylase

The broad distribution of quinoa in saline and non-saline environments is reflected in variations in the photosynthesis-associated mechanisms of different ecotypes. The aim of this study was to characterize the photosynthetic response to high salinity (0.4 M NaCl) of two contrasting Chilean genotypes, Amarilla (salt-tolerant, salares ecotype) and Hueque (salt-sensitive, coastal ecotype). Our results show that saline stress induced a significant decrease in the K+/Na+ ratio in roots and an increase in glycine betaine in leaves, particularly in the sensitive genotype (Hueque). Measurement of the photosynthesis-related parameters showed that maximum CO2 assimilation (Amax) in control plants was comparable between genotypes (ca. 9–10 μmol CO2 m−2 s−1). However, salt treatment produced different responses, with Amax values decreasing by 65.1% in the sensitive ecotype and 37.7% in the tolerant one. Although both genotypes maintained mesophyll conductance when stomatal restrictions were removed, the biochemical components of Amarilla were impaired to a lesser extent under salt stress conditions: for example, the maximum rate of ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO; Vcmax) was not as affected in Amarilla, revealing that this enzyme has a higher affinity for its substrate in this genotype and, thus, a better carboxylation efficiency. The present results show that the higher salinity tolerance of Amarilla was also due to its ability to control non-diffusional components, indicating its superior photosynthetic capacity compared to Hueque, particularly under salt stress conditions.

scholarly journals The Effect of Grafting on Calcium Influx in Tomato Fruits under Salt Stress Conditions

2019 ◽  
Vol 20 (2) ◽  
pp. 65
Author(s):  
Ivana Koleška ◽  
Dino Hasanagić ◽  
Rodoljub Oljača ◽  
Vida Todorović ◽  
Borut Bosančić ◽  
...  
Keyword(s):  
Salt Stress ◽  
Soil Salinity ◽  
Calcium Influx ◽  
Stress Conditions ◽  
Salinity Level ◽  
Tomato Fruits ◽  
Tomato Plants ◽  
The Third ◽  
Salinity Levels ◽  
Tomato Cultivars

Two commercial tomato cultivars were used to determine whether grafting could prevent decrease of Ca2+ concentration under salt stress conditions. The cultivars Buran F1 and Berberana F1 were grafted onto rootstock "Maxifort" and grown under three levels of the elevated soil salinity (S1 EC 3.80 dS m-1, S2 6.95 dS m-1 and S3 9.12 dS m-1). Ca2+ concentration of non-grafted plants of both examined hybrids was lower at all salinity levels in comparison to the control. In the fruits of grafted plants salt stress significantly decreased Ca2+ concentration only at the third salinity level (EC 9.12 dS m-1). The possibility of grafting tomato plants to improve influx of Ca2+ under salt stress conditions is discussed.

scholarly journals Exogenous Foliar Melatonin Improves Cotton (Gossypium Hirsutum L.) Physio-Biochemical Characteristics Under the Synergetic Effects of Low Temperature and Salinity Stress

2021 ◽  
Author(s):  
Yuanyuan Fu ◽  
Abdoul Kader Mounkaila Hamani ◽  
Wenjun Sun ◽  
Hongbo Wang ◽  
Abubakar Sunusi Amin ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Stress ◽  
Salinity Stress ◽  
Membrane Damage ◽  
Ion Homeostasis ◽  
Physiological Mechanism ◽  
Low Temperature Stress ◽  
Stress Conditions ◽  
Pairwise Correlation ◽  
Ion Translocation

Abstract Low temperature and soil salinization during cotton sowing and seedling have adverse effects on cotton productivity. Finding an alternative for reducing the low temperature and salt induced damages during the seedling stage of cotton is a challenge for agricultural researchers nowadays. The physiological mechanism of exogenously applied melatonin (MT) on cotton seedlings under low temperature and salt stress is still unclear. The experiment in a phytotron was comprised with two temperature levels of 15°C and 25°C, and 5 MT treatments of 0, 50, 100, 150, 200 µM, and two salinity levels of 0 and 150 mM NaCl stress. Compared with the control treatments (non-salinity stress under 15°C and 25°C), the coupled stress of salt and low temperature reduced cotton seedlings’ biomass and net photosynthetic rate (Pn), aggravated the membrane damage, reduced the potassium (K+) content and increased the sodium (Na+) accumulation in the leaves and roots. Compared with the NaCl-stressed treatment alone, the exogenous foliar applications of 50-150µM MT significantly increased the biomass and gas exchange parameters of cotton seedlings under the coupled salt and low temperature stress conditions. The exogenously applied MT at 50-150µM under the coupled effect of salt and low temperature stress conditions decreased the degree of membrane damage and regulated the activities of the protective enzymes, ion homeostasis, ion transport and absorption of cotton seedlings. The pairwise correlation analysis of each parameter by MT shows that the parameters with higher correlation with MT at 15°C are mainly malondialdehyde (MDA), peroxidase (POD), and catalase (CAT). The most relevant parameters at 25℃ are K+ concentration in leaves (K+-L), K+ concentration in root (K+-R), Na+ concentration in leaves (Na+-L), Na+ concentration in root (Na+-R), Na+ uptake in-root surface (Na+-uptake), K+ ion translocation (K+-translocation). Stepwise linear regression of the above parameters found that MT is more related to MDA at 15°C, and MT is more related to Na+-L at 25°C.

scholarly journals Strategies of urban trees for mitigating salt stress: a case study of eight plant species

Trees ◽  
2020 ◽  
Author(s):  
Wojciech Dmuchowski ◽  
Paulina Brągoszewska ◽  
Dariusz Gozdowski ◽  
Aneta H. Baczewska-Dąbrowska ◽  
Tadeusz Chojnacki ◽  
...  
Keyword(s):  
Salt Stress ◽  
Soil Salinity ◽  
Tree Species ◽  
High Stress ◽  
Urban Trees ◽  
Leaf Damage ◽  
Individual Species ◽  
Street Trees ◽  
Ionic Imbalance ◽  
Very High

Abstract Key message Some species synthesize larger amounts of polyprenols, which probably increase the plant’s ability to mitigate salt stress. Salt stress does not cause macronutrient deficiency in the leaves of urban trees. Ionic imbalance in the leaves caused by soil salinity worsens the health status of sensitive species. Abstract Street trees are exposed to relatively high stress levels, and the average lifespan of street trees is shortened compared to those of trees living under controlled natural conditions. Soil salinity adversely affects trees at all stages of growth and development. This study attempts to determine how the urban environment, with particular emphasis on salt stress, affects tree species with different levels of salinity sensitivity. The aim of this study was to identify the strategies of eight tree species for mitigating salt stress based on the determination of the chemical composition of the macroelements in the leaves, the ionic imbalance, and the ability of the trees to synthesize and accumulate polyprenols in the leaves. The obtained results suggest that individual species implemented different strategies in response to salt stress. The low sensitivity species: Q. rubra, R. pseudoacacia, G. triacanthos and A. campestre. blocked the uptake of Cl and Na to the leaves. The medium-sensitivity species: P. x hispanica blocked the uptake of Cl and Na and G. biloba maintained very high contents of Cl and Na in its leaves without leaf damage and synthesized large amounts of polyprenols. G. triacanthos and A. campestre synthesized large amounts of polyprenols. The high-sensitivity species (T. x euchlora and A. platanoides) exhibited very high contents of Cl and Na in their leaves, which were significantly damaged and had a pronounced ionic imbalance. These effects were not compensated for by the increased synthesis of polyprenols. In conclusion, the accumulation of polyprenols in leaf tissue may be one of the strategies that increase the resistance of plants to salt stress. Plants have many other methods of mitigating salt stress.

scholarly journals Agro-Physiologic Responses and Stress-Related Gene Expression of Four Doubled Haploid Wheat Lines under Salinity Stress Conditions

Biology ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 56
Author(s):  
Ibrahim Al-Ashkar ◽  
Walid Ben Romdhane ◽  
Rania A. El-Said ◽  
Abdelhalim Ghazy ◽  
Kotb Attia ◽  
...  
Keyword(s):  
Gene Expression ◽  
Salt Stress ◽  
Salinity Stress ◽  
Doubled Haploid ◽  
Stress Conditions ◽  
Path Coefficient ◽  
Related Gene ◽  
Salt Tolerant ◽  
Wheat Genotypes ◽  
Doubled Haploid Lines

Salinity majorly hinders horizontal and vertical expansion in worldwide wheat production. Productivity can be enhanced using salt-tolerant wheat genotypes. However, the assessment of salt tolerance potential in bread wheat doubled haploid lines (DHL) through agro-physiological traits and stress-related gene expression analysis could potentially minimize the cost of breeding programs and be a powerful way for the selection of the most salt-tolerant genotype. We used an extensive set of agro-physiologic parameters and salt-stress-related gene expressions. Multivariate analysis was used to detect phenotypic and genetic variations of wheat genotypes more closely under salinity stress, and we analyzed how these strategies effectively balance each other. Four doubled haploid lines (DHLs) and the check cultivar (Sakha93) were evaluated in two salinity levels (without and 150 mM NaCl) until harvest. The five genotypes showed reduced growth under 150 mM NaCl; however, the check cultivar (Sakha93) died at the beginning of the flowering stage. Salt stress induced reduction traits, except the canopy temperature and initial electrical conductivity, which was found in each of the five genotypes, with the greatest decline occurring in the check cultivar (Sakha-93) and the least decline in DHL2. The genotypes DHL21 and DHL5 exhibited increased expression rate of salt-stress-related genes (TaNHX1, TaHKT1, and TaCAT1) compared with DHL2 and Sakha93 under salt stress conditions. Principle component analysis detection of the first two components explains 70.78% of the overall variation of all traits (28 out of 32 traits). A multiple linear regression model and path coefficient analysis showed a coefficient of determination (R2) of 0.93. The models identified two interpretive variables, number of spikelets, and/or number of kernels, which can be unbiased traits for assessing wheat DHLs under salinity stress conditions, given their contribution and direct impact on the grain yield.

scholarly journals Exogenous application of xanthine and uric acid and nucleobase-ascorbate transporter MdNAT7 expression regulate salinity tolerance in apple

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Tingting Sun ◽  
Tingting Pei ◽  
Lulu Yang ◽  
Zhijun Zhang ◽  
Mingjun Li ◽  
...  
Keyword(s):  
Uric Acid ◽  
Salt Stress ◽  
Salinity Stress ◽  
Ion Homeostasis ◽  
Oxygen Species ◽  
Ros Scavenging ◽  
Exogenous Application ◽  
Global Agriculture ◽  
Tolerance To Salinity ◽  
Transgenic Apple

Abstract Background Soil salinity is a critical threat to global agriculture. In plants, the accumulation of xanthine activates xanthine dehydrogenase (XDH), which catalyses the oxidation/conversion of xanthine to uric acid to remove excess reactive oxygen species (ROS). The nucleobase-ascorbate transporter (NAT) family is also known as the nucleobase-cation symporter (NCS) or AzgA-like family. NAT is known to transport xanthine and uric acid in plants. The expression of MdNAT is influenced by salinity stress in apple. Results In this study, we discovered that exogenous application of xanthine and uric acid enhanced the resistance of apple plants to salinity stress. In addition, MdNAT7 overexpression transgenic apple plants showed enhanced xanthine and uric acid concentrations and improved tolerance to salinity stress compared with nontransgenic plants, while opposite phenotypes were observed for MdNAT7 RNAi plants. These differences were probably due to the enhancement or impairment of ROS scavenging and ion homeostasis abilities. Conclusion Our results demonstrate that xanthine and uric acid have potential uses in salt stress alleviation, and MdNAT7 can be utilized as a candidate gene to engineer resistance to salt stress in plants.

Proteomic analysis of the enhancement of seed vigour in osmoprimed alfalfa seeds germinated under salinity stress

2013 ◽  
Vol 23 (2) ◽  
pp. 99-110 ◽  
Author(s):  
Rafika Yacoubi ◽  
Claudette Job ◽  
Maya Belghazi ◽  
Wided Chaibi ◽  
Dominique Job
Keyword(s):  
Salt Stress ◽  
Salinity Stress ◽  
Soil Salinity ◽  
Seedling Establishment ◽  
Untreated Control ◽  
Protein Accumulation ◽  
Seed Vigour ◽  
Negative Effect ◽  
Experimental Salinity ◽  
Alfalfa Seeds

AbstractAlfalfa (Medicago sativa L.) yield is severely compromised by soil salinity, especially at the level of seedling establishment. This question was addressed by proteomics to decipher whether specific changes in protein accumulation correlate with germination performance of alfalfa seeds submitted to a salinity stress as obtained by imbibing seeds in the presence of NaCl. This study used alfalfa seeds submitted to an osmopriming invigoration treatment that proved very efficient in counteracting the negative effect of salinity stress on germination performance. Comparative proteomic analyses disclosed 94 proteins commonly characterizing the response of both the untreated control and osmoprimed seeds to the experimental salinity stress. Remarkably, many of them, representing 84 proteins, showed contrasting accumulation patterns when comparing the untreated control and osmoprimed seeds submitted to the same salt stress. Thus numerous changes observed in the proteome of the untreated control seeds imbibed in the presence of salt, and presumably accounting for the loss in seed vigour associated with salinity stress, can be substantially reversed in osmoprimed seeds undergoing this stress. These data therefore provide a biochemical understanding of the increase in seed vigour generally observed with primed seeds.

scholarly journals Effect of Different Priming Methods on Germination and Seedling Establishment of Two Medicinal Plants under Salt Stress Conditions

2015 ◽  
Vol 48 (3) ◽  
pp. 43-51 ◽  
Author(s):  
O. Younesi ◽  
A. Moradi
Keyword(s):  
Salt Stress ◽  
Seed Germination ◽  
Medicinal Plants ◽  
Salinity Stress ◽  
Seedling Establishment ◽  
Growth Traits ◽  
Germination Rate ◽  
Stress Conditions ◽  
Metabolic Reaction ◽  
Lemon Balm

Abstract Priming is one of the seed enhancement methods that might be resulted in increasing seed performance (germination and emergence) under stress conditions, such as salinity. Salinity is a major environmental stress which adversely affects germination and seedling establishment in a wide variety of crops. The experiment was arranged as a factorial in completely randomized design (CRD) at Seed Research Laboratory of College of Agriculture, University of Tehran, Iran. The objective of this research was to evaluate the effect of different priming methods on seed germination of two medicinal plants including lemon balm (Melissa officinalis L.) and cumin (Cuminum cyminum L.) under salinity stress. Treatments were combinations of two levels of salinity stress (0 and 10 dsm−1) and five levels of priming (control = non-priming), GA3, manitol, NaCl and distilled water) with three replications. Seeds of lemon balm and cumin were primed for 24 h at 25°C. Results revealed that different growth traits (including germination percentage, germination rate, seedling dry weight, plumule and radical length) significantly (p=0.05) decreased with applying salinity. However, priming of seeds with different materials particularly GA3 was useful for alleviating salt stress effects and improving germination and seedling establishment under salt stress. Under salinity condition, primed seeds possessed more germination and emergence than control. The result of this experiment is consistent with the hypothesis that under salinity stress, priming can prepare a suitable metabolic reaction in seeds and can improve seed germination performance and seedling establishment.

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