scholarly journals Reduction of drought stress effect in spring barley (Hordeum vulgare L.) by nitrogen fertilization

2008 ◽  
Vol 54 (No. 1) ◽  
pp. 7-13 ◽  
Author(s):  
M. Krček ◽  
P. Slamka ◽  
K. Olšovská ◽  
M. Brestič ◽  
M. Benčíková
Keyword(s):  
Drought Stress ◽  
Nitrogen Fertilization ◽  
Water Regime ◽  
Reductase Activity ◽  
Spring Barley ◽  
Stress Conditions ◽  
Growth Stages ◽  
Moisture Regime ◽  
Stress Effect ◽  
Optimum Water

An effect of nitrogen rates (0.0 g, 1.0 g, 2.0 g N per pot) on NRA (nitrate reductase activity) in leaves of spring barley (cultivar Kompakt) was investigated in a pot experiment. Plants were grown under optimum moisture regime and drought stress was induced during the growth stages of tillering, shooting and earing. Before and after respective stress period plants were grown under optimal water regime. In all the fertilized and unfertilized treatments, NRA was significantly higher under optimal water regime than in drought stress conditions. Nitrogen fertilization alleviated adverse effects of drought stress on the yields of grain; the rate of 1 g N per pot increased the grain yield of plants stressed during tillering 3.73 times compared to unfertilized and stressed treatment. When the stress was induced during shooting or earing grain yields declined by over 50% compared to optimal water regime; when compared with stressed and unfertilized treatment, the rate of 1 g N however increased yield by 29% (stress at shooting) and 55% (stress at earing). NRA values were significantly higher when plants were grown under optimum water regime than under stress conditions as well as when fertilized with nitrogen compared to unfertilized control both under optimum water regime and drought stress.

scholarly journals Methionine-induced regulation of growth, secondary metabolites and oxidative defense system in sunflower (Helianthus annuus L.) plants subjected to water deficit stress

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0259585
Author(s):  
Gull Mehak ◽  
Nudrat Aisha Akram ◽  
Muhammad Ashraf ◽  
Prashant Kaushik ◽  
Mohamed A. El-Sheikh ◽  
...  
Keyword(s):  
Drought Stress ◽  
Helianthus Annuus ◽  
Water Deficit ◽  
Soluble Sugars ◽  
Foliar Spray ◽  
Shoot Length ◽  
Stress Conditions ◽  
Growth And Yield ◽  
Water Deficit Stress ◽  
Growth Stages

Optimum water availability at different growth stages is one the major prerequisites of best growth and yield production of plants. Exogenous application of plant growth regulators considered effective for normal functioning of plants under water-deficit conditions. A study was conducted to examine the influence of exogenously applied L-methionine on sunflower (Helianthus annuus L.) plants grown under water-deficit conditions. Twenty-five-day old seedlings of four sunflower cultivars, FH331, FH572, FH652 and FH623 were exposed to control (100% F.C.) and drought stress (60% F.C.) conditions. After 30-day of drought stress, L-methionine (Met; 20 mg/L) was applied as a foliar spray to control and drought stressed plants. Water deficit stress significantly reduced shoot fresh and dry weights shoot and root lengths, and chlorophyll a content in all four cultivars. While a significant increase was observed due to water deficiency in relative membrane permeability (RMP), malondialdehyde (MDA), total soluble proteins (TSP), total soluble sugars (TSS), ascorbic acid (AsA) and activity of peroxidase (POD). Although, exogenously applied Met was effective in decreasing RMP, MDA and H2O2 contents, it increased the shoot fresh weight, shoot length, chlorophyll a, chlorophyll a/b ratio, proline contents and the activities of SOD, POD and CAT enzymes in all four cultivars under water deficit stress. No change in AsA and total phenolics was observed due to foliar-applied Met under water stress conditions. Of all sunflower cultivars, cv. FH-572 was the highest and cv. FH-652 the lowest of all four cultivars in shoot fresh and dry weights as well as shoot length under drought stress conditions. Overall, foliar applied L-methionine was effective in improving the drought stress tolerance of sunflower plants that was found to be positively associated with Met induced improved growth attributes and reduced RMP, MDA and H2O2 contents under water deficit conditions.

scholarly journals Ameliorative roles of compost on okra (Abelmoschus esculentus L.) exposed to drought stress at vegetative and reproductive growth stages

2020 ◽  
Vol 12 (4) ◽  
pp. 884-900
Author(s):  
Okechukwu S. EZEH ◽  
Sifau A. ADEJUMO
Keyword(s):  
Drought Stress ◽  
Growth Stage ◽  
Field Capacity ◽  
Proline Accumulation ◽  
Growth And Yield ◽  
Growth Stages ◽  
Stress Effect ◽  
Reproductive Growth ◽  
Different Growth Stages ◽  
Amended Soil

Okra growth and yield are adversely affected by drought at different growth stages. This is aggravated by poor soil fertility. In this study, the roles of compost applied at 0, 5 and 10 t/ha on the tolerance and morpho-physiological response of okra (NHAe 47-4) exposed to varying levels of water stress (25%, 50%, 75% and 100% field capacity, FC), at different growth stages (vegetative, reproductive and vegetative-reproductive stages) for ten days duration were assessed. Data were collected on okra growth and yield, leaf relative water content (LRWC), leaf photosynthetic pigments (LPG) and proline accumulation. Results showed that drought stress reduced LRWC, LPG, growth and yield of Okra. This reduction was more evident in okra plants exposed to severe stress for 10 days and at the reproductive stage. Soil amendment with compost however, had cushioning effect on drought stressed okra. Compared to control, it increased the LRWC, LPG, growth and yield of okra. The ameliorative roles of compost were however, dependent on stress intensity, compost dosage, okra growth stage and stress duration. Though, okra plants stressed at 25% FC were more affected by drought stress, but compared to the un-amended soil, those grown on amended soil were more tolerant. Higher compost rate was superior to lower rates. Whereas, higher proline accumulation was recorded in plant exposed to 25% field capacity without amendment, proline accumulation was reduced in the plants grown on compost amended soil and exposed to drought which was an indication of stress reduction. Generally, okra stressed at vegetative growth stage only was able to recover rapidly and had better yield compared to those stressed at reproductive growth stage. It is concluded that addition of compost to soil could reduce the drought stress effect on okra.

Reaction of Peanut Genotypes under Drought Stress to Aspergillus flavus and A. parasiticus1

1989 ◽  
Vol 16 (2) ◽  
pp. 109-113 ◽  
Author(s):  
H. A. Azaizeh ◽  
R. E. Pettit ◽  
O. D. Smith ◽  
R. A. Tabef
Keyword(s):  
Soil Moisture ◽  
Drought Stress ◽  
Arachis Hypogaea ◽  
Aspergillus Flavus ◽  
Aflatoxin Contamination ◽  
Stress Conditions ◽  
Moisture Regime ◽  
Greenhouse Experiments ◽  
Arachis Hypogaea L ◽  
Peanut Shells

Abstract Seven peanut genotypes (Arachis hypogaea L.) were tested in greenhouse and microplot experiments during two consecutive years to determine peanut peg colonization by Aspergillus flavus and to determine the effect of two drought stress treatments on the susceptibility of peanut shells and kernels to Aspergillus colonization and aflatoxin contamination. Moisture tensions within the soil and temperatures of the soil and air were monitored during these experiments. Colonization of peanut pegs was inconsistent among genotypes and between years. In general, low soil moisture tension enhanced colonization of peanut shells and kernels. Shells of most genotypes were highly colonized after harvest from each moisture regime. Kernels of all genotypes were more susceptible to A. flavus and A. parasiticus colonization under both long and short drought stress conditions compared to non-stressed conditions. However, no significant differences were obtained in the degree of Aspergillus infestation of kernels from PI 337409, Starr, and J-11 in the greenhouse experiments. Under microplot conditions, acomparison of several genotypes revealed that kernels from plants of genotypes TX811956 and TX798736 (short stress treatments) contained significantly lower Aspergillus infestation and kernels from the genotypes PI 337409 and TX811956 and TX798736 contained significantly less aflatoxin.

Identification of DNA markers associated with phenological traits in spring barley (Hordeum vulgare L.) under drought stress conditions

2021 ◽  
Author(s):  
Mitra Jabbari ◽  
Barat Ali Fakheri ◽  
Reza Aghnoum ◽  
Reza Darvishzadeh ◽  
Nafiseh Mahdi Nezhad ◽  
...  
Keyword(s):  
Drought Stress ◽  
Hordeum Vulgare ◽  
Dna Markers ◽  
Spring Barley ◽  
Stress Conditions ◽  
Hordeum Vulgare L

Flavonoid profiling by LC-MS IN 14 – 3-3ν knockout mutants of Arabidopsis thaliana during drought stress conditions

Planta Medica ◽  
2014 ◽  
Vol 80 (10) ◽  
Author(s):  
F Nabbie ◽  
O Shperdheja ◽  
J Millot ◽  
J Lindberg ◽  
B Peethambaran
Keyword(s):  
Arabidopsis Thaliana ◽  
Drought Stress ◽  
Stress Conditions ◽  
Knockout Mutants

Biochemical Markers and Genetic Improvement in some Tomato Genotypes under Drought Stress Conditions

2017 ◽  
Vol 2017 (3) ◽  
pp. 249-257
Author(s):  
Sherin Naiem ◽  
Zeinab El-Saka ◽  
S. M. Abou-Shleel ◽  
Kh. M. Ghanem
Keyword(s):  
Drought Stress ◽  
Biochemical Markers ◽  
Genetic Improvement ◽  
Stress Conditions ◽  
Tomato Genotypes

scholarly journals Identification and Expression Profiling of Nonphosphorus Glycerolipid Synthase Genes in Response to Abiotic Stresses in Dendrobium catenatum

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1204
Author(s):  
Xinqiao Zhan ◽  
Yichun Qian ◽  
Bizeng Mao
Keyword(s):  
Salt Stress ◽  
Drought Stress ◽  
Expression Profiling ◽  
Abiotic Stresses ◽  
Membrane Lipids ◽  
Chinese Herb ◽  
Growth Stages ◽  
Limited Information ◽  
Gene Structures ◽  
Functional Investigation

Dendrobium catenatum, a valuable Chinese herb, frequently experiences abiotic stresses, such as cold and drought, under natural conditions. Nonphosphorus glycerolipid synthase (NGLS) genes are closely linked to the homeostasis of membrane lipids under abiotic stress in plants. However, there is limited information on NGLS genes in D. catenatum. In this study, a total of eight DcaNGLS genes were identified from the D. catenatum genome; these included three monogalactosyldiacylglycerol synthase (DcaMGD1, 2, 3) genes, two digalactosyldiacylglycerol synthase (DcaDGD1, 2) genes, and three sulfoquinovosyldiacylglycerol synthase (DcaSQD1, 2.1, 2.2) genes. The gene structures and conserved motifs in the DcaNGLSs showed a high conservation during their evolution. Gene expression profiling showed that the DcaNGLSs were highly expressed in specific tissues and during rapid growth stages. Furthermore, most DcaNGLSs were strongly induced by freezing and post-freezing recovery. DcaMGD1 and DcaSQDs were greatly induced by salt stress in leaves, while DcaDGDs were primarily induced by salt stress in roots. Under drought stress, most DcaNGLSs were regulated by circadian rhythms, and DcaSQD2 was closely associated with drought recovery. Transcriptome analysis also revealed that MYB might be regulated by circadian rhythm and co-expressed with DcaNGLSs under drought stress. These results provide insight for the further functional investigation of NGLS and the regulation of nonphosphorus glycerolipid biosynthesis in Dendrobium.

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