scholarly journals Enhanced antioxidant defense after exogenous application of Ca2+ and K+ in Brassica napus seedlings under water deficit stress

2011 ◽  
Vol 10 (64) ◽  
pp. 14052-14060
Author(s):  
Alam Rizwan ◽  
Iqbal Aqib ◽  
Khan Ikhtiar ◽  
Ali Ijaz ◽  
Munir Iqbal ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Water Deficit ◽  
Antioxidant Defense ◽  
Water Deficit Stress ◽  
Exogenous Application

scholarly journals Exogenous Application of Brassinosteroid 24-Norcholane 22(S)-23-Dihydroxy Type Analogs to Enhance Water Deficit Stress Tolerance in Arabidopsis thaliana

2021 ◽  
Vol 22 (3) ◽  
pp. 1158
Author(s):  
Katy Díaz ◽  
Luis Espinoza ◽  
Rodrigo Carvajal ◽  
Evelyn Silva-Moreno ◽  
Andrés F. Olea ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Drought Stress ◽  
Stress Tolerance ◽  
Water Deficit ◽  
Alternative Pathway ◽  
Recovery Period ◽  
Homogeneous Solution ◽  
Water Deficit Stress ◽  
Marker Genes ◽  
Exogenous Application

Brassinosteroids (BRs) are plant hormones that play an essential role in plant development and have the ability to protect plants against various environmental stresses, such as low and high temperature, drought, heat, salinity, heavy metal toxicity, and pesticides. Mitigation of stress effects are produced through independent mechanisms or by interaction with other important phytohormones. However, there are few studies in which this property has been reported for BRs analogs. Thus, in this work, the enhancement of drought stress tolerance of A. thaliana was assessed for a series of 2-deoxybrassinosteroid analogs. In addition, the growth-promoting activity in the Rice Lamina Inclination Test (RLIT) was also evaluated. The results show that analog 1 exhibits similar growth activity as brassinolide (BL; used as positive control) in the RLIT bioassay. Interestingly, both compounds increase their activities by a factor of 1.2–1.5 when they are incorporated to polymer micelles formed by Pluronic F-127. On the other hand, tolerance to water deficit stress of Arabidopsis thaliana seedlings was evaluated by determining survival rate and dry weight of seedlings after the recovery period. In both cases, the effect of analog 1 is higher than that exhibited by BL. Additionally, the expression of a subset of drought stress marker genes was evaluated in presence and absence of exogenous applied BRs. Results obtained by qRT-PCR analysis, indicate that transcriptional changes of AtDREBD2A and AtNCED3 genes were more significant in A. thaliana treated with analog 1 in homogeneous solution than in that treated with BL. These changes suggest the activation of alternative pathway in response to water stress deficit. Thus, exogenous application of BRs synthetic analogs could be a potential tool for improvement of crop production under stress conditions.

Exogenous application of gamma-aminobutyric acid (GABA) alleviates the effect of water deficit stress in black cumin ( Nigella sativa L.)

2018 ◽  
Vol 112 ◽  
pp. 741-748 ◽  
Author(s):  
Esmaeil Rezaei-Chiyaneh ◽  
Seyyed Mohammad Seyyedi ◽  
Elnaz Ebrahimian ◽  
Sina Siavash Moghaddam ◽  
Christos A. Damalas
Keyword(s):  
Water Deficit ◽  
Nigella Sativa ◽  
Aminobutyric Acid ◽  
Water Deficit Stress ◽  
Gamma Aminobutyric Acid ◽  
Black Cumin ◽  
Exogenous Application ◽  
Effect Of Water

scholarly journals Effects of Water Deficit Stress on Several Quantitative and Qualitative Characteristics of Canola (Brassica napus L.) Cultivars

2011 ◽  
Vol 3 (3) ◽  
pp. 120-125 ◽  
Author(s):  
Mohammad HOSSEINI ◽  
Payman HASSIBI
Keyword(s):  
Brassica Napus ◽  
Water Deficit ◽  
Harvest Index ◽  
Stem Elongation ◽  
Early Flowering ◽  
Water Deficit Stress ◽  
Flowering Stage ◽  
Brassica Napus L ◽  
Early Emergence ◽  
Biological Yield

Water deficit stress considered as one of the most important limiting factors for oil seed canola (Brassica napus L.) growth and productivity in Iran. To evaluate the effects of water deficit stress on some qualitative and quantitative characteristics of canola cultivars, this experiment in a greenhouse trial carried out as factorial based on completely randomized design with three replications in Shahid Chamran University of Ahwaz (Iran). Canola cultivars, including ‘Hyola 308’, ‘Hyola 401’ and ‘RGS 003’ as first factor, and the second one was three levels of water deficit stress, including stress at early stem elongation stage to early flowering (D1), early flowering stage to early emergence of sacs (D2), beginning of stem elongation stage to early emergence of sacs (D3) and normal irrigation (C, as check). Results showed that the interaction between water deficit stress and cultivars affected biological yield, seed oil yields and harvest index (p≤0.01), dry matter and economic yield (p≤0.05). Water deficit stress reduced grain oil yields. ‘Hyola 308’ under stress at beginning stem elongation stage to early flowering had the lowest oil yields (1.1 g plants-1) and ‘Hyola 401’ under non-stress conditions showed highest oil yields (4.3 g plants-1). The decrease of oil yields at the flowering stage to stem elongation stage was more than the other stages. In addition, water deficit stress reduced harvest index in the three stress levels due to reduced economic yield and reduced biological yield. Stress susceptibility index for ‘Hyola 401’ at the beginning of stem elongation stage to early emergence of sacs was 0.914 and the ‘Hyola 308’ showed 1.12 at the beginning of stem elongation stage to early emergence of sacs respectively, which it can implies that ‘Hyola 308’ is more sensitive than ‘Hyola 401’ to water deficit stress.

scholarly journals Trichoderma harzianum Enhances Antioxidant Defense of Tomato Seedlings and Resistance to Water Deficit

2012 ◽  
Vol 25 (9) ◽  
pp. 1264-1271 ◽  
Author(s):  
Fatemeh Mastouri ◽  
Thomas Björkman ◽  
Gary E. Harman
Keyword(s):  
Water Deficit ◽  
Redox State ◽  
Antioxidant Defense ◽  
Defense Mechanism ◽  
Water Deficit Stress ◽  
Ros Scavenging ◽  
Protective Mechanisms ◽  
Biotic Stresses ◽  
Tomato Seedlings ◽  
Genes Encoding

Some plant-symbiotic strains of the genus Trichoderma colonize roots and induce profound changes in plant gene expression that lead to enhanced growth, especially under biotic and abiotic stresses. In this study, we tested the hypothesis that one of the protective mechanisms enhanced by T. harzianum T22 colonization is the antioxidant defense mechanism. Having established that strain T22 modulates the expression of the genes encoding antioxidant enzymes, the status of antioxidant defense of tomato seedlings in response to colonization by T22 and water deficit was investigated. Total ascorbate or glutathione levels were not affected by either stimuli, but under water deficit, antioxidant pools became more oxidized (lower ratios of reduced to oxidized forms), whereas colonized plants maintained redox state as high as or higher than unstressed and untreated plants. The enhanced redox state of colonized plants could be explained by their higher activity of ascorbate and glutathione-recycling enzymes, higher activity of superoxide dismutase, catalase, and ascorbate peroxidase, in both root and shoot throughout the experiment. Similar enzymes were induced in uncolonized plants in response to water-deficit stress but to a lower extent when compared with colonized plants. This orchestrated enhancement in activity of reactive oxygen species (ROS)-scavenging pathways in colonized plants in response to stress supports the hypothesis that enhanced resistance of colonized plants to water deficit is at least partly due to higher capacity to scavenge ROS and recycle oxidized ascorbate and glutathione, a mechanism that is expected to enhance tolerance to abiotic and biotic stresses.

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