Comparative Effects of Indole Acetic Acid on Photosynthetic Pigments and Mineral Contents of Two Genotypes of Okra Under Salinity Stress

2020 ◽  
Vol 2 (6) ◽  
Author(s):  
A. M. Esan ◽  
C. O. Olaiya ◽  
T. O. Omolekan ◽  
K. A. Aremu ◽  
H. R. Y. Adeyemi
Keyword(s):  
Acetic Acid ◽  
Salt Stress ◽  
Salinity Stress ◽  
Photosynthetic Pigments ◽  
Indole Acetic Acid ◽  
Research Work ◽  
Negative Control ◽  
Control Groups ◽  
Mineral Contents ◽  
Major Threat

Salinity stress causes a major threat to crops productivity across the globe. The effects of salt stress on photosynthetic pigments and minerals content were studied in this research work. The seeds of the two genotypes of okra (47-4 and LD 88) were pre-soaked in the solutions of IAA (0.4, 0.5, and 0.6 mM concentrations) and the seeds were sown in 10 kg of soil in polyethene bags already contained 0, 100, and 200 mM NaCl respectively. Salinity stress significantly reduced photosynthetic pigments and minerals content of the two genotypes of okra. Treatment of okra seeds with IAA at varying concentrations improved salt tolerance of the two genotypes, which is evident with increase photosynthetic pigments and minerals concentrations under salinity stress relatives to the negative control groups. Finally, we can infer from the results of this study that pre-soaked seeds with 0.4 mM IAA significantly ameliorated the effects of salinity on the two genotypes of okra, and this concentration could serve as a promising phytohormone for okra plant under moderate and severe salt levels.

scholarly journals Characterization of Plant Growth-Promoting Traits and Inoculation Effects on Triticum durum of Actinomycetes Isolates under Salt Stress Conditions

Soil Systems ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 26
Author(s):  
Rihab Djebaili ◽  
Marika Pellegrini ◽  
Massimiliano Rossi ◽  
Cinzia Forni ◽  
Maria Smati ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Salt Stress ◽  
Plant Growth ◽  
Durum Wheat ◽  
Growth And Development ◽  
Indole Acetic Acid ◽  
Greenhouse Experiment ◽  
Hydrocyanic Acid ◽  
In Vitro Assays

This study aimed to characterize the halotolerant capability, in vitro, of selected actinomycetes strains and to evaluate their competence in promoting halo stress tolerance in durum wheat in a greenhouse experiment. Fourteen isolates were tested for phosphate solubilization, indole acetic acid, hydrocyanic acid, and ammonia production under different salt concentrations (i.e., 0, 0.25, 0.5, 0.75, 1, 1.25, and 1.5 M NaCl). The presence of 1-aminocyclopropane-1-carboxylate deaminase activity was also investigated. Salinity tolerance was evaluated in durum wheat through plant growth and development parameters: shoot and root length, dry and ash-free dry weight, and the total chlorophyll content, as well as proline accumulation. In vitro assays have shown that the strains can solubilize inorganic phosphate and produce indole acetic acid, hydrocyanic acid, and ammonia under different salt concentrations. Most of the strains (86%) had 1-aminocyclopropane-1-carboxylate deaminase activity, with significant amounts of α-ketobutyric acid. In the greenhouse experiment, inoculation with actinomycetes strains improved the morpho-biochemical parameters of durum wheat plants, which also recorded significantly higher content of chlorophylls and proline than those uninoculated, both under normal and stressed conditions. Our results suggest that inoculation of halotolerant actinomycetes can mitigate the negative effects of salt stress and allow normal growth and development of durum wheat plants.

scholarly journals Low pH alleviated salinity stress of ginger seedlings by enhancing photosynthesis, fluorescence, and mineral element contents

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10832
Author(s):  
Fengman Yin ◽  
Shanying Zhang ◽  
Bili Cao ◽  
Kun Xu
Keyword(s):  
Salt Stress ◽  
Chlorophyll Fluorescence ◽  
Salt Tolerance ◽  
Salinity Stress ◽  
Low Ph ◽  
Nutrient Acquisition ◽  
Mineral Element ◽  
Mineral Contents ◽  
Photosynthesis Efficiency ◽  
Element Contents

We investigated the effects of low pH on the photosynthesis, chlorophyll fluorescence, and mineral contents of the leaves of ginger plants under salt stress. This experiment involved four treatments: T1 (pH 6, 0 salinity), T2 (pH 4, 0 salinity), T3 (pH 6, 100 mmol L−1 salinity) and T4 (pH 4, 100 mmol L−1 salinity). This study showed that photosynthesis (Pn, Gs, WUE and Tr) and chlorophyll fluorescence (qP, Φ PSII, and Fv/Fm) significantly decreased under salt stress; however, all the parameters of the ginger plants under the low-pH treatment and salt stress recovered. Moreover, low pH reduced the content of Na and enhanced the contents of K, Mg, Fe and Zn in the leaves of ginger plants under salt stress. Taken together, these results suggest that low pH improves photosynthesis efficiency and nutrient acquisition and reduces the absorption of Na, which could enhance the salt tolerance of ginger.

scholarly journals Silicon Mediated Changes in Growth and Photosynthetic Pigment of Wheat Plant Under Salt Stress

2021 ◽  
Author(s):  
Pooja Singh ◽  
Vikram Kumar ◽  
Jyoti Sharma ◽  
Asha Sharma
Keyword(s):  
Salt Stress ◽  
Sodium Silicate ◽  
Photosynthetic Pigments ◽  
Stress Condition ◽  
Plant Biomass ◽  
Photosynthetic Pigment ◽  
Research Work ◽  
Stressed Condition ◽  
Salt Stress Condition ◽  
Wheat Genotypes

Abstract Purpose Salinity is a most important environmental stress which adversely affects the crop production and yield. In recent years, Silicon (Si) is gaining an increased attention in the field of stress management. Wheat (Triticum aestivum L.) is one of the moderately prone crops to different abiotic stresses which instantly damage the crop yield under stress condition. This work demonstrates the positive impact of Si on growth and photosynthetic pigments in wheat under saline conditions.Methods In this research work, two genotypes of wheat i.e. KRL 210 and WH 1105, were grown-up in soil under different salt stress concentration. There were different treatments under which they grown included T0= Control without salt stress (0 dS m-1) , T1= Sodium silicate without salt stress (2 mM) , T2= Control with salt stress (4 dS m-1) T3= Control with salt stress (8 dS m-1) T4= Control with salt stress (12 dS m-1) T5= Sodium silicate with salt stress (4dS m -1 + 2mM Si) T6= Sodium silicate with salt stress (8dS m-1 +2 mM Si) T7= Sodium silicate with salt stress (12dS m-1 +2mM Si). At vegetative stage, both the wheat genotypes were compared with their growth parameters and photosynthetic pigments.Results Plant biomass, shoot-root length and photosynthetic pigments (chlorophyll- a, b, carotenoid & total chlorophyll) of wheat decreased under salt stress when increased up to 12 dS m-1 NaCl concentration. However, in salt stressed wheat plants, plant biomass increased by the Si application. Supplementation of Si improved the plant length as well as chlorophyll pigments which were decreased by the high salt concentration in plants. Silicon was found more effective in salt stressed condition than in alone with control.Conclusion So, it was determined that the Si application aided the wheat genotypes in alleviating salinity and enhancing their biomass and photosynthetic pigments which were declined in salt stress condition.

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