scholarly journals Improved performance of muskmelon (Cucumis melo) seeds with osmoconditioning

2013 ◽  
Vol 52 (1-2) ◽  
pp. 121-137 ◽  
Author(s):  
G. Singh ◽  
S. S. Gill ◽  
Kamaljit K. Sandhu
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Dehydrogenase Activity ◽  
Cucumis Melo ◽  
Electrical Conductance ◽  
Dry Weight ◽  
Peg 6000 ◽  
Germination Speed ◽  
Improved Performance ◽  
Increased Activity

Seeds of muskmelon (<em>Cucuniis melo</em>) cultivars viz Pb. Hybrid and Pb. Sunehri were osmoconditioned with Polyethylene glycol (PEG) and KNO<sub>3</sub> solutions to enhance their performance at low temperature. Osmoconditioning both with PEG 6000 and KNO<sub>3</sub> increased per cent germination, speed of germination, vigour in terms of dry weight and length of the seedlings and root/shoot ratios. KNO<sub>3</sub> priming recorded more pronounced effects in all the above mentioned parameters. Other vigour parameters such as electrical conductance of seed leachates was decreased with osmoconditioning whi]e dehydrogenase activity was enhanced. Osmoconditioning resulted in increased activity of amylases.

INCREASED SEEDLING ESTABLISHMENT OF IMPATIENS WALLERANA IN RESPONSE TO LOW TEMPERATURE OR POLYETHYLENE GLYCOL SEED TREATMENTS

1980 ◽  
Vol 60 (2) ◽  
pp. 561-569 ◽  
Author(s):  
JOHN SIMMONDS
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Seedling Establishment ◽  
Large Scale ◽  
Soil Cover ◽  
Commercial Production ◽  
Seedling Development ◽  
Peg 6000 ◽  
Pre Treatment ◽  
Impatiens Wallerana

Seeds of Impatiens wallerana ’Elfin Scarlet’ were pre-treated with low temperature (8 °C) imbibition and hypertonic osmotic solutions of polyethylene glycol (PEG) 6000 in an attempt to improve seedling establishment under greenhouse conditions. Seeds held at 8 °C for 7 or 14 days germinated faster at 25 °C than non-treated seeds; seedling development was more rapid and there was a significant improvement in seedling establishment. Application of a soil cover improved seedling establishment in both control and pre-treated seeds. PEG pre-treated seeds germinated within 24 h of being released from osmotic control. The optimum pre-treatment was determined to be PEG −7.5 bars for 10 days, which resulted in 80% germination within 24 h, more advanced seedling development after 5 days, 92% seedling establishment and earlier flowering. Although PEG pre-treatments were superior to the low temperature pre-treatments, they are not readily applicable on a large scale. However, low temperature seed pre-treatment can be easily utilized to improve seedling establishment in commercial production.

scholarly journals The physiology of extremely desiccated Brassica juncea (L) seeds

2013 ◽  
Vol 46 (2) ◽  
pp. 5-13
Author(s):  
Savita Khattra ◽  
Kiranjyoti Sharma ◽  
Gurmit Singh
Keyword(s):  
Dehydrogenase Activity ◽  
Brassica Juncea ◽  
Electrical Conductance ◽  
Seed Storage ◽  
Dry Weight ◽  
Germination Capacity ◽  
Seed Moisture ◽  
Different Levels

Seeds of four raya cvs., viz. RL 1359, RLM 198, RLM 619 and RLM 514 were desiccated for 2, 7, 15 and 45 days wchich led to different levels of seed moisture. Data on germination capacity speed of germination, seedling dry weight, electrical conductance, dehydrogenase activity and seed storage behaviour for up to two years after desiccation were recorded. Based on this data, cvs. RL 1359 and RLM 514 were found to be tolerant to desiccation 10 as low as 0.73 and 1.16 per cent seed moisture levels, respectively. Seeds of RLM 198 tolerated desiccation up to 2.28 per cent seed moisture. However, RLM 619 seeds showed desiccation injuries in seedling dry weight, electrical conductance and speed of germination at moisture levels below 5.67 per cent.

scholarly journals GERMINATION AND VIGOUR IN SEEDS OF THE COWPEA IN RESPONSE TO SALT AND HEAT STRESS

2019 ◽  
Vol 32 (1) ◽  
pp. 143-151 ◽  
Author(s):  
Luma Rayane de Lima Nunes ◽  
Paloma Rayane Pinheiro ◽  
Charles Lobo Pinheiro ◽  
Kelly Andressa Peres Lima ◽  
Alek Sandro Dutra
Keyword(s):  
Salt Stress ◽  
Heat Stress ◽  
High Temperature ◽  
Low Temperature ◽  
Vigna Unguiculata ◽  
Salt Concentration ◽  
Dry Weight ◽  
Germination Percentage ◽  
Different Types ◽  
Different Temperatures

ABSTRACT Salinity is prejudicial to plant development, causing different types of damage to species, or even between genotypes of the same species, with the effects being aggravated when combined with other types of stress, such as heat stress. The aim of this study was to evaluate the tolerance of cowpea genotypes (Vigna unguiculata L. Walp.) to salt stress at different temperatures. Seeds of the Pujante, Epace 10 and Marataoã genotypes were placed on paper rolls (Germitest®) moistened with different salt concentrations of 0.0 (control), 1.5, 3.0, 4.5 and 6.0 dS m-1, and placed in a germination chamber (BOD) at temperatures of 20, 25, 30 and 35°C. The experiment was conducted in a completely randomised design, in a 3 × 4 × 5 scheme of subdivided plots, with four replications per treatment. The variables under analysis were germination percentage, first germination count, shoot and root length, and total seedling dry weight. At temperatures of 30 and 35°C, increases in the salt concentration were more damaging to germination in the Epace 10 and Pujante genotypes, while for the Marataoã genotype, damage occurred at the temperature of 20°C. At 25°C, germination and vigour in the genotypes were higher, with the Pujante genotype proving to be more tolerant to salt stress, whereas Epace 10 and Marataoã were more tolerant to high temperatures. Germination in the cowpea genotypes was more sensitive to salt stress when subjected to heat stress caused by the low temperature of 20°C or high temperature of 35°C.

Zirconia‐dispersed polyethylene glycol composites with a low temperature‐degradation rate

2020 ◽  
pp. 50384
Author(s):  
Allif Rosyidy Hilmi ◽  
Nibras Fuadi Muwwaqor ◽  
Nur Aini Fauziyah ◽  
Suminar Pratapa
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Degradation Rate

Acetyl salicylic acid alleviates chilling-induced damage in muskmelon seedlings

2007 ◽  
Vol 87 (3) ◽  
pp. 581-585 ◽  
Author(s):  
Ahmet Korkmaz ◽  
Murat Uzunlu ◽  
Ali Riza Demirkiran
Keyword(s):  
Salicylic Acid ◽  
Cucumis Melo ◽  
Chilling Stress ◽  
Foliar Spray ◽  
Dry Weight ◽  
Acetyl Salicylic Acid ◽  
Signal Molecule ◽  
Stress Indicator ◽  
Shoot Dry Weight ◽  
Significant Difference

Salicylic acid (SA) is a common plant-produced signal molecule that is responsible for inducing tolerance to a number of biotic and abiotic stresses. An experiment was, therefore, conducted to test whether acetyl salicylic acid (ASA) application at various concentrations through seed immersion or foliar spray would protect muskmelon [Cucumis melo L. (Reticulatus Group)] seedlings subjected to chilling stress. Twenty-one-day-old plants pre-treated with ASA (0, 0.1, 0.25, 0.50 or 1.0 mM) were subjected to chilling stress for 72 h at 3 ± 0.5°C. ASA, applied either through seed immersion or foliar spray, was effective within the range of 0.1 to 1 mM in inducing tolerance to chilling stress in muskmelon seedlings; however, there was no significant difference between application methods. ASA significantly and curvilinearly affected all seedling growth and stress indicator variables tested except shoot dry weight. The best protection was obtained from seedlings pre-treated with 0.5 mM ASA. The highest ASA concentration used was slightly less effective in providing chilling stress protection. Even though both methods provided similar means of protection, due to its simplicity and practicality, immersion of muskmelon seeds prior to sowing in 0.5 mM ASA would be a more desirable method to induce tolerance to chilling stress. Key words: Cucumis melo, aspirin, chilling stress tolerance, gas exchange, electrolyte leakage

scholarly journals Effect of Polyethylene Glycol (PEG) on Particle Distribution of Mn0.25Fe2.75O4-PEG 6000 Nanoparticles

2018 ◽  
Vol 1093 ◽  
pp. 012005
Author(s):  
Sunaryono ◽  
Kormil Saputra ◽  
Rosabiela Irfa Andina ◽  
Nurul Hidayat ◽  
Ahmad Taufiq ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Particle Distribution ◽  
Peg 6000

An Experimental Approach to the Reclamation of a Limestone Quarry Floor: the Fourth to Seventh Years

1986 ◽  
Vol 13 (4) ◽  
pp. 337-345 ◽  
Author(s):  
David J. Hambler ◽  
Jean M. Dixon
Keyword(s):  
Experimental Approach ◽  
Ecological Impact ◽  
Nutrient Deficiency ◽  
Dry Weight ◽  
Abundant Species ◽  
Organic Content ◽  
Limestone Quarry ◽  
Grassland Species ◽  
Epilobium Angustifolium ◽  
Improved Performance

An experiment to suggest a technique for rehabilitation of a hard-limestone quarry floor in northern England was carried into its seventh year (see also Dixon & Hambler, 1984). The stress-tolerant grass Festuca rubra var. fallax Hack, cultivar Cascade proved suitable as a primary colonist, especially when sown onto rubble treated with a powdery manure derived from sewage. The community so produced was composed mainly of F. rubra and mosses, their proportions varying reciprocally with time but remaining approximately stable in a series of summer estimates of percentage cover.The dry-weight per unit area of this vegetation, and that of other experimental sets, did not increase between the third and sixth years of the experiment. The organic content of the developing soil, however, increased considerably. Trifolium repens, where sown with the grass, had no obvious ecological impact, although its improved performance on Rabbit ‘middens’ indicated the general nutrient deficiency of the site.A net flow of immigrant flowering-plants into the experimental site slowed down by the seventh year. Limestone grassland species arrived but the most abundant species were ruderals. All of the potentially large ruderal species failed to attain their full competitive potential, as did F. rubra. The community dominated by F. rubra and mosses proved unfavourable for the establishment of both Poa annua and Epilobium angustifolium— the latter being regarded as a particularly undesirable weed in this context.The concept of visual acceptability was applied as a measure of the success of each sowing/treatment combination; the most successful might be recommended for rehabilitation of a worked-out limestone quarry.

Synergistic effect of VOx and MnOx surface species for improved performance of V2O5/Ce0.5Ti0.5−xMnxO2−δ catalysts in low-temperature NH3-SCR of NO

2018 ◽  
Vol 8 (24) ◽  
pp. 6360-6374 ◽  
Author(s):  
Thanh Huyen Vuong ◽  
Stephan Bartling ◽  
Ursula Bentrup ◽  
Henrik Lund ◽  
Jabor Rabeah ◽  
...  
Keyword(s):  
Low Temperature ◽  
Synergistic Effect ◽  
Catalytic Performance ◽  
Surface Species ◽  
Nh3 Scr ◽  
Redox Couples ◽  
Scr Of No ◽  
Improved Performance

Inserting adjacent Mn3+/Mn2+ and VO3+/VO2+ redox couples in Ce1−xTixO2 improves catalytic performance.

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