scholarly journals Application of Cyanobacteria (Roholtiella sp.) Liquid Extract for the Alleviation of Salt Stress in Bell Pepper (Capsicum annuum L.) Plants Grown in a Soilless System

Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 104
Author(s):  
Adewale Suraj Bello ◽  
Radhouane Ben-Hamadou ◽  
Helmi Hamdi ◽  
Imen Saadaoui ◽  
Talaat Ahmed
Keyword(s):  
Salt Stress ◽  
Water Content ◽  
Capsicum Annuum ◽  
Chlorophyll A ◽  
Relative Water Content ◽  
Growth Characteristics ◽  
Bell Pepper ◽  
Control Group ◽  
Capsicum Annuum L ◽  
Relative Water

Salinity is one of the abiotic stresses that affect crop growth and productivity in arid and semi-arid regions. Unfortunately, there are few known methods to mitigate the deleterious impacts of salt stress on the development and yield of vegetable crops. Blue-green algae (cyanobacteria) are endowed with the potential to curb the negative impacts of salt stress as they are characterized by biostimulant properties. The present work aimed to investigate the effects of Roholtiella sp. as a foliar extract on the growth characteristics, physiological and biochemical responses of bell pepper (Capsicum annuum L.) plants under varying levels of salinity conditions. A soilless water experiment was carried out in a greenhouse where bell pepper seedlings were grown under five salt concentrations (0, 50, 200, 150, and 200 mM of NaCl). Growth characteristics, pigments content, relative water content, and antioxidant activity (CAT) were determined. Our results showed that growth parameters, relative water content (RWC), chlorophyll a & b concentrations under salinity conditions were negatively affected at the highest concentration (200 mM). Interestingly, the application of Roholtiella sp. foliar extract enhanced the plant growth characteristics as shoot length increased by 17.014%, fresh weight by 39.15%, dry and weight by 31.02%, at various salt treatments. Moreover, chlorophyll a and b increased significantly compared with seedlings sprayed with water. Similarly, RWC exhibited a significant increase (92.05%) compared with plants sprayed with water. In addition, antioxidants activities and accumulation of proline were improved in Roholtella sp. extract foliar sprayed seedlings compared to the plants foliar sprayed with water. Conclusively, at the expiration of our study, the Rohotiella sp. extract-treated plants were found to be more efficient in mitigating the deleterious effects caused by the salinity conditions which is an indication of an enhancement potential of tolerating salt-stressed plants when compared to the control group.

scholarly journals Effects of Salt Stress on Plant Growth, Nutrient Partitioning, Chlorophyll Content, Leaf Relative Water Content, Accumulation of Osmolytes and Antioxidant Compounds in Pepper (Capsicum annuum L.) Cultivars

2017 ◽  
Vol 45 (2) ◽  
pp. 481-490 ◽  
Author(s):  
Mathias J. HAND ◽  
Victor D. TAFFOUO ◽  
Alphonse E. NOUCK ◽  
Kitio P.J. NYEMENE ◽  
Brice TONFACK ◽  
...  
Keyword(s):  
Water Content ◽  
Capsicum Annuum ◽  
Relative Water Content ◽  
Dry Weight ◽  
Salinity Level ◽  
Antioxidant Compounds ◽  
Capsicum Annuum L ◽  
Nutrient Partitioning ◽  
Relative Water ◽  
Leaf Relative Water Content

The salinity of soil is among the most important abiotic stresses which limit agricultural productivity worldwide. The effects of salinity on growth, nutrient partitioning, chlorophyll, leaf relative water content, osmolytes accumulation and antioxidant compounds of pepper (Capsicum annuum L.) cultivars (‘Granada’, ‘Goliath’ and ‘Nobili’), widely used in Cameroon, were investigated. Plants were subjected to four levels of NaCl (0, 50, 100 and 200 mM) at early seedling growth stage of plant development. Application of NaCl treatment led to a significant increase in total  soluble  sugars,  proline; soluble proteins; total free amino acids content, peroxydase and superoxide dismutase activity and total phenolic content in salt-tolerant ‘Granada’ and ‘Nobili’ compared to salt-sensitive ‘Goliath’ and untreated plants, on the contrary, decreased in root dry weight, shoot dry weight, number of leaves, shoot length, stem diameter, total leaf area, chlorophyll and leaf relative water content in ‘Goliath’ at low salinity level. Flavonoid content, K, Ca and Mg concentrations were significantly reduced with increasing salinity in all cultivars. The highest Na concentrations were detected in the leaves while the lowest were recorded in the roots of ‘Goliath’ at high salinity level. The salt sensitivity of ‘Goliath’ seems to be increased osmotic adjustment through the strongly accumulation of Na in leaves while the salt tolerance of ‘Granada’ was related to its induce of antioxidative enzyme system more efficiently, resulting in higher osmolytes accumulation under salinity. ‘Granada’ was more tolerant and stable in physiological and biochemical traits suggesting that it could be grown in salt-affected soils.

scholarly journals xpression of aquaporin subtypes (GhPIP1;1, GhTIP2;1, and GhSIP1;3) in cotton (Gossypium hirsutum L.) submitted to salt stress

AoB Plants ◽  
2019 ◽  
Author(s):  
Luana C C Braz ◽  
Pedro D Fernandes ◽  
Daniela D Barbosa ◽  
Wellison F Dutra ◽  
Carliane R C Silva ◽  
...  
Keyword(s):  
Salt Stress ◽  
Gas Exchange ◽  
Gossypium Hirsutum ◽  
Water Content ◽  
Relative Water Content ◽  
Dry Matter ◽  
Rna Extraction ◽  
Gossypium Hirsutum L ◽  
Relative Water ◽  
Agricultural Regions

Abstract Salinization leads to several worldwide damages in agricultural regions, mainly in semiarid regions where leaching of salt is poor due to limited and erratic rainfall. Cotton (Gossypium hirsutum L.) is a Malvaceae with wide genetic variability to salt stress. The identification of salinity tolerant genotypes is a dynamic target in a breeding program, and the selection is often based on plant phenotypes. Molecular markers are reliable tools to aid in these selection procedures. Aquaporin (AQPs) are channel proteins that play fundamental role in water relations and tolerance to environmental stresses. Plants have fine regulation of water transport through AQPs activities. In order to evaluate the AQP expressions of different cotton cultivars submitted to salt stress, we use molecular and physiological tools, based on RT-qPCR and gas exchange assays. Seven cultivars were submitted to 95 mM NaCl, started at V3 stage (21 days after emergence), during 72 h. At the end of stress treatment, root tissues were used to total RNA extraction, followed by cDNA synthesis and RT-qPCR analyzes. Three sets of specific primers were used, drawn from AQP accessions deposited in NCBI. Additionally, full expanded leaves were used to gas exchange assays and to estimate the relative water content. The dry matter of the shoots was also evaluated. Based on pattern of AQPs transcripts, we found that all semiarid tolerant cultivars (BRS Seridó, 7MH, CNPA MT 2009 152 and BRS 416) showed downregulation of AQP subtypes, mainly GhPIP1;1 and GhTIP2;1 whose action is characterized as tolerant to salinity. The results of gas exchanges, relative water content and dry matter were consistent with the molecular findings in these cultivars, confirming that GhPIP1;1 and GhTIP2;1, located at plasma membrane and vacuoles, respectively, could be adopted as AQP markers for identification of cotton tolerant to salt stress.

scholarly journals Shading as a means of mitigating water deficit in seedlings of Campomanesia xanthocarpa (Mart.) O. Berg

2020 ◽  
Vol 48 (1) ◽  
pp. 234-244
Author(s):  
Edinéia M.M. BARTIERES ◽  
Silvana P.Q. SCALON ◽  
Daiane M. DRESCH ◽  
Edvânia A.S. CARDOSO ◽  
Mailson V. JESUS ◽  
...  
Keyword(s):  
Water Content ◽  
Water Deficit ◽  
Relative Water Content ◽  
Growth Characteristics ◽  
Water Deficiency ◽  
Cultivation Conditions ◽  
Continuous Irrigation ◽  
Intermittent Irrigation ◽  
Relative Water ◽  
Number Of Leaves

In this research it was hypothesized that Campomanesia xanthocarpa can overcome some level of water deficiency by adjusting physiological parameters and that shading minimizes the water deficit effects while maintaining elevated photosynthetic rates and relative water content of the leaves and makes a resumption of metabolism and growth when the water supply is normalized. The seedlings were submitted to two water regimes (continuous irrigation - CI and intermittent irrigation - II), three shading percentages (0, 30 and 70%) and six evaluation times (Start - T0, 1st Photosynthesis Zero - 1st P0, 1st Recovery - 1st REC, 2nd Photosynthesis Zero - 2nd P0, 2nd Recovery - 2nd REC and END). Plants under water deficit at 0% shading led to a reduction in photosynthetic metabolism, relative water content (RWC), leaf area, number of leaves, and height, especially during the stress periods 1st and 2nd P0. The 30 and 70% shading mitigated the stressful effect of water deficit on C. xanthocarpa seedlings. The results did not confirm the hypothesis that C. xanthocarpa seedlings are intolerant to water deficit since, although sensitive, they presented a potential for recovery of photosynthetic and growth characteristics under all cultivation conditions. It was concluded that that shading minimizes the stressful effects of water deficit.

scholarly journals Changes in plant growth, leaf relative water content and physiological traits in response to salt stress in peanut (Arachis hypogaea L.) varieties

2021 ◽  
Vol 49 (1) ◽  
pp. 12049
Author(s):  
Tekam L. MEGUEKAM ◽  
Dany P. MOUALEU ◽  
Victor D. TAFFOUO ◽  
Hartmut STÜTZEL
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Water Content ◽  
Arachis Hypogaea ◽  
Relative Water Content ◽  
Physiological Traits ◽  
Salt Tolerant ◽  
Arachis Hypogaea L ◽  
Relative Water ◽  
Leaf Relative Water Content

Salinity is the main environmental factor accountable for decreasing crop productivity worldwide. The effects of NaCl salinity on plant growth (leaf relative water content (RWC), leaf dry weight (LDW), shoot length (SL), number of leaves (NL), number of branches (NB) and total leaf area (TLA) and physiological characteristics (stomatal conductance (gs), transpiration rate (TR), net photosynthetic (Pn), yield of photosystem II (ΦPsII) and the intercellular CO2 concentration (CO2int) in peanut (Arachis hypogaea L.) varieties (‘Vanda’, ‘P244601’ and ‘Pl184948’, widely used in Cameroon, Tanzania and Ghana, respectively, were investigated under hydroponic condition. Plants were subjected to four levels of NaCl (0, 40, 80 and 120 mM) at early seedling growth stage of plant development. Application of NaCl treatment led to a significant decrease in LDW, SL, NL, TLA, Pn, gs, TR and CO2int concentration of ‘Vanda’ and ‘P244601’ compared to untreated plants while the plant growth inhibition was notably noted at 120 mM NaCl in ‘P1184948’ for LDW, SL and NB. The highest depressive effect was detected in gs of salt-sensitive ‘Vanda’ while the lowest were recorded in gs of salt-tolerant ‘P1184948’ at high salinity level. Enhanced NaCl concentrations led to a significant increase in ΦPSII of ‘P1184948’ compared to ‘Vanda’, ‘P244601’ and untreated plants. Leaf CHL content was significantly increased in moderately-tolerant ‘‘P244601’ and salt-tolerant ‘P1184948’ at 80 mM NaCl compared to salt sensitive ‘Vanda’ and untreated plants. The depressive effect of salt on RWC was recorded at 120 mM NaCl in peanut leaves of all varieties. Under salt stress ‘P1184948’ was observed to have relatively higher tolerance on average of all growth and physiological traits than ‘Vanda’ and P244601’ suggesting that it could be grown in salt-affected soils.

scholarly journals Phenotyping of rice in salt stress environment using high-throughput infrared imaging

2014 ◽  
Vol 73 (1) ◽  
pp. 312-321 ◽  
Author(s):  
Zamin S. Siddiqui ◽  
Jung-Il Cho ◽  
Sung-Han Park ◽  
Taek-Ryoun Kwon ◽  
Gang-Seob Lee ◽  
...  
Keyword(s):  
Salt Stress ◽  
Stomatal Conductance ◽  
Water Content ◽  
Relative Water Content ◽  
Infrared Imaging ◽  
Oryza Sativa L ◽  
Photosynthetic Parameters ◽  
Relative Water ◽  
Stress Environment ◽  
And Performance

Abstract Phenotyping of rice (Oryza sativa L. cv. Donggin) in salt stress environment using infrared imaging was conducted. Results were correlated with the most frequently used physiological parameters such as stomatal conductance, relative water content and photosynthetic parameters. It was observed that stomatal conductance (R2 = -0.618) and relative water content (R2 = -0.852) were significantly negatively correlated with average plant temperature (thermal images), while dark-adapted quantum yield (Fv/Fm, R2 = -0.325) and performance index (R2 = -0.315) were not consistent with plant temperature. Advantages of infrared thermography and utilization of this technology for the selection of stress tolerance physiotypes are discussed in detail.

scholarly journals Antioxidant activity of enzymatic system of two different wheat (Triticum aestivum L.) cultivars growing under salt stress

2011 ◽  
Vol 57 (No. 3) ◽  
pp. 101-107 ◽  
Author(s):  
W.M. Bhutta
Keyword(s):  
Antioxidant Enzymes ◽  
Salt Stress ◽  
Water Content ◽  
Relative Water Content ◽  
Stability Index ◽  
Membrane Stability ◽  
Membrane Stability Index ◽  
Salt Tolerant ◽  
Stress Levels ◽  
Relative Water

Soil salinity and semi-arid and arid climate of Pakistan is a major constraint in agriculture and predominantly in foodstuff production. It limits crop yield and use of land previously uncultivated. Wheat is moderately salt tolerant. A great variation was observed between and within the cultivars (genotypes: S-24 salt tolerant and DN-27 salt sensitive) in relationship to the choice of salinity level (control and treatments: in increment of 25 mol/m<sup>3</sup> NaCl/day to a final level of 80 and 160 mol/m<sup>3 </sup>NaCl into the nutrient solution) that will be used for screening purpose. Relative water content (RWC), membrane stability index and the activities of some antioxidant enzymes were determined after 20 and 40 days of salt stress exposure. As a result of activity enzymes, superoxide dismutase (SOD), peroxidase (POD) and catalase increased in S-24 with the increase of salt stress, while in DN-27 all the enzymes showed constant activity at all the stress levels. Meanwhile, relative water content and membrane stability index decrease the value as well as they increases the stress levels. It can be concluded that all three antioxidant enzymes were limiting factors for these genotypes and these reasons also led to the salt sensitivity in DN-27. Different selection methods should be applied to improve different traits in different conditions in wheat.

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