scholarly journals Low Doses of Cuscuta reflexa Extract Act as Natural Biostimulants to Improve the Germination Vigor, Growth, and Grain Yield of Wheat Grown under Water Stress: Photosynthetic Pigments, Antioxidative Defense Mechanisms, and Nutrient Acquisition

Biomolecules ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1212 ◽  
Author(s):  
Qasim Ali ◽  
Rashida Perveen ◽  
Mohamed A. El-Esawi ◽  
Shafaqat Ali ◽  
Syed Makhdoom Hussain ◽  
...  
Keyword(s):  
Water Stress ◽  
Seed Germination ◽  
Seed Yield ◽  
Photosynthetic Pigments ◽  
Defense Mechanisms ◽  
Seed Priming ◽  
Low Doses ◽  
Antioxidative Defense ◽  
Cuscuta Reflexa ◽  
Germination Vigor

The present study was conducted to investigate the effects of Cuscuta reflexa extract (CRE) on the activities of germination enzymes, seed germination vigor, biomass production, physio-biochemical attributes, and seed yield of water-stressed wheat plants. Different levels of CRE (0, 10, 20, 30, 40, and 50%), including water soaking, were used as seed priming. Water stress negatively affected the seed germination, germination enzyme activities, growth, yield, and different physio-biochemical attributes of wheat plants. Low doses of CRE (10, 20, and 30%) ameliorated the adverse effects of water stress on seed germination attributes, and activities of germination enzymes, but negative impacts were recorded at higher doses (40 and 50%) of CRE. Water-stressed wheat plants grown from seeds pre-treated with low doses of CRE also showed better growth and yield as compared with non-treated ones, and that was associated with an improvement in water relations, photosynthetic pigments, nutrient acquisition, reduced lipid peroxidation, and better antioxidative defense mechanisms. The maximum increase in seed yield was 14.77 and 12.32%, found in plants grown from seeds treated with 20% and 10% CRE, respectively. In conclusion, it is suggested that using low doses of CRE as seed priming can contribute to better wheat yield under water stress, especially in semi-arid and arid areas.

scholarly journals Foliar Spray of Fe-Asp Confers Better Drought Tolerance in Sunflower as Compared with FeSO4: Yield Traits, Osmotic Adjustment, and Antioxidative Defense Mechanisms

Biomolecules ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1217 ◽  
Author(s):  
Qasim Ali ◽  
Shafaqat Ali ◽  
Mohamed A. El-Esawi ◽  
Muhammad Rizwan ◽  
Muhammad Azeem ◽  
...  
Keyword(s):  
Amino Acids ◽  
Lipid Peroxidation ◽  
Water Stress ◽  
Drought Tolerance ◽  
Water Relations ◽  
Seed Yield ◽  
Photosynthetic Pigments ◽  
Defense Mechanisms ◽  
Foliar Spray ◽  
Antioxidative Defense

Different techniques are being employed to reduce the adverse effects of water stress on seed yield and quality of crop plants. The current study aimed to improve the water stress tolerance of field-grown sunflower by foliar-supplied ecofriendly iron-chelated aspartate (Fe-Asp) in comparison with FeSO4. Water stress decreased the plant growth and yield, accompanied with disturbed water relations, nutrient acquisition, accumulation of amino acids, and antioxidative defense mechanisms. However, lipid peroxidation, total anthocyanin, and photosynthetic pigments were increased. Fertigation of FeSO4 and Fe-Asp as foliar sprays proved effective to reduce the negativities of limited irrigation on biomass production and seed yield, accompanied with a reduction in lipid peroxidation and improvements in water relations, antioxidative defense mechanisms, and leaf photosynthetic pigments. In comparison with FeSO4, foliary applied Fe-Asp better improved the plant water relations with more accumulation of essential amino acids and nutrient acquisition, especially leaf aspartate (Asp) and Fe accumulation which showed better translocation. Overall, foliary applied Fe-Asp proved better for induction of drought tolerance in sunflower plants as compared with FeSO4. The study recommended the use of the ecofriendly Fe-Asp as a foliar spray for better growth and production of sunflower under limited irrigation.

scholarly journals Use of Nitric Oxide and Hydrogen Peroxide for Better Yield of Wheat (Triticum aestivum L.) under Water Deficit Conditions: Growth, Osmoregulation, and Antioxidative Defense Mechanism

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 285 ◽  
Author(s):  
Noman Habib ◽  
Qasim Ali ◽  
Shafaqat Ali ◽  
Muhammad Tariq Javed ◽  
Muhammad Zulqurnain Haider ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Water Stress ◽  
Drought Stress ◽  
Grain Yield ◽  
Photosynthetic Pigments ◽  
Defense Mechanism ◽  
Field Capacity ◽  
Growth And Yield ◽  
Antioxidative Defense

The present experiment was carried out to study the influences of exogenously-applied nitric oxide (NO) donor sodium nitroprusside (SNP) and hydrogen peroxide (H2O2) as seed primers on growth and yield in relation with different physio-biochemical parameters, antioxidant activities, and osmolyte accumulation in wheat plants grown under control (100% field capacity) and water stress (60% field capacity) conditions. During soaking, the seeds were covered and kept in completely dark. Drought stress markedly reduced the plant growth, grain yield, leaf photosynthetic pigments, total phenolic content (TPC), total soluble proteins (TSP), leaf water potential (Ψw), leaf turgor potential (Ψp), osmotic potential (Ψs), and leaf relative water content (LRWC), while it increased the activities of enzymatic antioxidants and the accumulation of leaf ascorbic acid (AsA), proline (Pro), glycine betaine (GB), malondialdehyde (MDA), and H2O2. However, seed priming with SNP and H2O2 alone and in combination mitigated the deleterious effects of water stress on growth and yield by improving the Ψw, Ψs, Ψp, photosynthetic pigments, osmolytes accumulation (GB and Pro), TSP, and the antioxidative defense mechanism. Furthermore, the application of NO and H2O2 as seed primers also reduced the accumulation of H2O2 and MDA contents. The effectiveness was treatment-specific and the combined application was also found to be effective. The results revealed that exogenous application of NO and H2O2 was effective in increasing the tolerance of wheat plants under drought stress in terms of growth and grain yield by regulating plant–water relations, the antioxidative defense mechanism, and accumulation of osmolytes, and by reducing the membrane lipid peroxidation.

scholarly journals Responses of Seed Germination, Seedling Growth, and Seed Yield Traits to Seed Pretreatment in Maize (Zea maysL.)

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yu Tian ◽  
Bo Guan ◽  
Daowei Zhou ◽  
Junbao Yu ◽  
Guangdi Li ◽  
...  
Keyword(s):  
Seed Germination ◽  
Seed Yield ◽  
Seedling Growth ◽  
Germination Rate ◽  
Seed Priming ◽  
Grain Weight ◽  
Shoot Biomass ◽  
Control Group ◽  
Yield Traits ◽  
Seed Pretreatment

A series of seed priming experiments were conducted to test the effects of different pretreatment methods to seed germination, seedling growth, and seed yield traits in maize (Zea maysL.). Results indicated that the seeds primed by gibberellins (GA), NaCl, and polyethylene glycol (PEG) reagents showed a higher imbibitions rate compared to those primed with water. The final germination percentage and germination rate varied with different reagents significantly (P<0.05). The recommended prime reagents were GA at 10 mg/L, NaCl at 50 mM, and PEG at 15% on account of germination experiment. 15% PEG priming reagent increased shoot and root biomass of maize seedling. The shoot biomass of seedlings after presoaking the seeds with NaCl reagent was significantly higher than the seedlings without priming treatment. No significant differences of plant height, leaf number, and hundred-grain weight were observed between control group and priming treatments. Presoaking with water, NaCl (50 mM), or PEG (15%) significantly increased the hundred-grain weight of maize. Therefore, seed pretreatment is proved to be an effective technique to improve the germination performance, seedling growth, and seed yield of maize. However, when compared with the two methods, if immediate sowing is possible, presoaking is recommended to harvest better benefits compared to priming method.

Micro-nutrients Seed Priming and rhizobium Coating on Seed Vigour, Crop Growth and Seed Yield in Blackgram (Vigna mungo L.)

2021 ◽  
Author(s):  
S. Kavitha ◽  
P. Srimathi
Keyword(s):  
Seed Germination ◽  
Seed Yield ◽  
Field Experiments ◽  
Seed Quality ◽  
Seed Priming ◽  
Quality Parameters ◽  
Crop Growth ◽  
Seedling Vigour ◽  
Seed Vigour ◽  
Vigour Index

Background: Black gram is the important pulses crop, grown throughout the country; gives low seed yield mainly due to poor management and low soil fertility. Development of suitable technology is essential to enhance productivity. Seed priming is one such effective technology which enhance rapid and uniform emergence to achieve high vigour, leading to better stand establishment and yield. The current research aimed to study micronutrient seed priming and rhizobium coating on seed germination, seedling vigour, crop growth and seed yield in black gram.Methods: Blackgram seeds were primed with 10 different micronutrient solutions with different concentrations and evaluated for its quality parameters to find out suitable seed priming technique. Seeds from two best priming treatments were coated with rhizobium @ 30g/kg of seed and evaluated for its production potential and resultant seed quality under field condition.Result: Seed priming with 0.5% ZnSO4 at 1/3rd seed to solution ratio for 3 hours recorded higher germination (96%) and vigour index (3811) than control which recorded 84% seed germination and 2528 of vigour index under laboratory experiment. Field experiments revealed that, seeds primed with 0.5% ZnSO4 and coated with rhizobium @ 30g per kg of seeds improved seed yield by 13.2% over control. 

Mechanism of Action of Ethylene in Promoting the Germination of Cocklebur Seeds I. Osmoregulation

1990 ◽  
Vol 17 (5) ◽  
pp. 537 ◽  
Author(s):  
Y Esashi ◽  
S Matsuyama ◽  
M Hoshina ◽  
H Ashino ◽  
K Ishizawa
Keyword(s):  
Polyethylene Glycol ◽  
Water Stress ◽  
Seed Germination ◽  
Osmotic Pressure ◽  
Mechanism Of Action ◽  
Propyl Gallate ◽  
Seed Priming ◽  
Respiratory Inhibitors ◽  
Whole Seed ◽  
Stimulation Of

The germination potentials of upper and lower seeds of cocklebur (Xanthium pennsylvanicum Wallr.) were increased by pre-exposure to water stress imposed by mannitol or polyethylene glycol (PEG) solution. Both types of seeds were responsive to this 'seed priming' which was further enhanced by C2H4 applied exogenously for at least 1 day. The C2H4 effect that occurred during seed priming increased with increasing water stress. It was not influenced by respiratory inhibitors, such as cyanide, azide, benzohydroxymate or propyl gallate, but it was counteracted by CO2 and increased by O2 enrichment. Both C2H4 and O2 significantly increased osmolarity of the sap extracted from the whole seed, but CO2 reduced it. Similar events occurred in seed axial and especially in cotyledonary tissues, and in water extracts of these tissues. Increased osmotic pressure in response to C2H4 stimulated subsequent cotyledonary growth. These findings were applicable also to the action of C2H4 under anoxic conditions, in which the increased potential of seed germination caused by O2 shortage was further enhanced by C2H4 treatment. The higher osmolarities were linked to a stimulation of cotyledonary growth.

scholarly journals PRIMING OF BRACHIARIA SEEDS WITH DIFFERENT SUGAR SOURCES AND CONCENTRATIONS

2018 ◽  
Vol 31 (4) ◽  
pp. 843-849 ◽  
Author(s):  
Thiago Barbosa Batista ◽  
Eliana Duarte Cardoso Binotti ◽  
Flávio Ferreira da Silva Binotti ◽  
Marco Eustáquio de Sá ◽  
Tiago Alexandre da Silva
Keyword(s):  
Seed Germination ◽  
Seed Priming ◽  
Water Control ◽  
Physical Dormancy ◽  
Beneficial Effects ◽  
Physiological Quality ◽  
Seed Germination Vigor ◽  
Urochloa Brizantha ◽  
Germination Vigor ◽  
Direct Immersion

ABSTRACT Seed priming is a practice for improving the expression of seed physiological potential. Such technique consists of synchronizing and reducing the time of seed germination by controlled hydration. The aim of this study was to evaluate the effect of seed-priming with different sugar sources and concentrations on the physiological quality Urochloa brizantha seeds and initial seedling performance. Before treating, seeds were scarified chemically with concentrated sulphuric acid (H2SO4) for 5 minutes to overcome physical dormancy. The experimental design was completely randomized in a 3 x 6 factorial scheme consisting of priming using three sugar sources (glucose, sucrose, and maltose) and six concentrations (zero [water control], 2%, 5%, 10%, 15%, and 20%), with four replicates. The seeds were primed by direct immersion for 2 hours at 25 ºC and, after hydration, they were dried for moisture equilibrium recovery. Seed germination, vigor, viability, and initial seedling growth were evaluated. The results showed that glucose was the source able to promote beneficial effects on the germination of U. brizantha cv. MG-5 seeds. Moreover, the supply of glucose at the concentrations of 2 and 5% for physiological conditioning increased seedling dry phytomass.

scholarly journals Alpha-tocopherol fertigation confers growth physio-biochemical and qualitative yield enhancement in field grown water deficit wheat (Triticum aestivum L.)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Qasim Ali ◽  
Shafaqat Ali ◽  
Naeem Iqbal ◽  
Muhammad Tariq Javed ◽  
Muhammad Rizwan ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Water Stress ◽  
Stress Tolerance ◽  
Seed Yield ◽  
Photosynthetic Pigments ◽  
Nutritional Quality ◽  
Photosynthetic Efficiency ◽  
Foliar Spray ◽  
Enzymatic Antioxidants ◽  
Water Stress Tolerance

Abstract Water stress is a major problem to fulfill the world food demand and to solve the problem of malnutrition. Different strategies are being used to solve these problems including the fertigation of plants with different biochemical at different growth stages. The present study was conducted for the induction of drought tolerance in field grown wheat for better yield and nutritional quality through foliar spray of α-tocopherol (α-Toc) at start of reproductive stage. Water stress was maintained based on number of irrigation. Three levels of α-Toc 0.001, 0.01 and 0.1 mM were applied as foliar spray. Water stress significantly reduced the biomass production that associated with the decreased photosynthetic pigments, water relation, photosynthetic efficiency, but increased the lipid peroxidation, leaf relative membrane permeability, activities of antioxidant enzymes and the contents of phenolic, flavonoids, α-toc and ASA. Water stress also negatively effected the different yield attributes and seed nutrient quality. Foliar fertigation of wheat plants with α-Toc significantly improved the water stress tolerance of wheat plants in term of improvement in growth and seed yield associated with improved water relations, photosynthetic efficiency, contents of photosynthetic pigments and improvement in antioxidative defence mechanism (enzymatic and non-enzymatic antioxidants). Fertigation of water stressed wheat plants with α-Toc also improved the seed nutritional quality in terms of the contents of seed phenolics, flavonoids, activities of antioxidant enzymes and the content of α-, β- and γ-tocopherols. In conclusion, it was found that fertigation of water stressed wheat plants not only improved the water stress tolerance but also improved the seed yield and nutritional quality that will not only be helpful for the improvement in wheat yield that also be a step to solve the problem of malnutrition through the bio-fertification of α-Toc.

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