scholarly journals EFFECTS OF STORAGE ON TEE GERMINATION AND VIGOR OF MUSKMELON SEEDS FROM DIFFERENT STAGES OF DEVELOPMENT

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1134c-1134
Author(s):  
Gregory E. Welbaum
Keyword(s):  
Water Content ◽  
Storage Conditions ◽  
Seed Vigor ◽  
High Water Content ◽  
Prolonged Storage ◽  
Stages Of Development ◽  
Water Stress Tolerance ◽  
Immature Seeds ◽  
Wide Range ◽  
Mature Seeds

It is unclear from previous reports whether muskmelon seeds require an afterripenig period to attain maximum germinability and vigor. In the current study, seeds ranging in age from 30 to 60 days after anthesis were stored at water contents ranging from 3 to 15% and at either 6 or 30°C to determine whether seed vigor increased during storage. Changes in vigor were assessed by conducting monthly germination tests on blotter papers saturated with water or polyethylene glycol solutions of known water potential. The germination percentages of immature seeds (30 and 35 DAA) were dramatically improved by 3 months of storage at low water content and temperature, while the mean time to germination and the variability of germination were reduced for all stages of development. Germination percentages in water decline after storage at high water content and temperature with immature seeds showing a greater rate of decline than mature seeds but at reduced water potentials, the same adverse storage conditions increased the germination percents es and rates of mature seeds. However prolonged storage under adverse conditions, resulted in a gradual decline in water stress tolerance. Afterripening occurred over a wide range of storage conditions and significantly improved seed vigor, particularly in immature seeds. Furthermore, the increases in vigor achieved from afterripening treatments were remarkably similar to the increases in vigor attained through priming. Priming may substitute for the afterripening requirement of muskmelon seeds.

Dormancy Variations in Common Purslane Seeds

Weed Science ◽  
1974 ◽  
Vol 22 (6) ◽  
pp. 535-540 ◽  
Author(s):  
G. H. Egley
Keyword(s):  
Water Content ◽  
Seed Viability ◽  
High Water ◽  
High Water Content ◽  
Water Imbibition ◽  
Immature Seeds ◽  
Seed Age ◽  
Common Purslane ◽  
Black Seeds ◽  
Mature Seeds

Common purslane (Portulaca oleraceaL.) seeds, produced by the same plants, had different degrees of dormancy. The dormancy variations were caused neither by low seed viability nor by location on the plant where seeds were produced. Seed water content and seed age at time of collection contributed to, but were not solely responsible for, the dormancy variations. Immature, brown seeds of high water content were less dormant than the more mature, black seeds of low water content. The immature seeds germinated better in the dark than did the more mature seeds. A puncture in the seed, over the radicle, broke purslane dormancy. Dormancy was not caused by blockage of water imbibition by seeds. Purslane dormancy developed during later stages of seed maturation on the mother plant.

Germination of Developing Prickly Sida Seeds

Weed Science ◽  
1976 ◽  
Vol 24 (2) ◽  
pp. 239-243 ◽  
Author(s):  
G. H. Egley
Keyword(s):  
Water Content ◽  
Seed Coat ◽  
Mother Plant ◽  
Dry Storage ◽  
Water Imbibition ◽  
Immature Seeds ◽  
Sida Spinosa ◽  
Prickly Sida ◽  
Mature Seeds ◽  
Days After Anthesis

Freshly-produced, mature prickly sida (Sida spinosaL.) seeds (18 to 21 days after anthesis, < 20% water content) were dormant and neither imbibed water nor germinated when incubated for up to 4 weeks under several light and temperature conditions. Over 80% of the freshly-produced, immature seeds (12 to 16 days after anthesis, > 20% water content) germinated when removed from the mother-plant before dehydration and incubated in alternating 20 to 30 C for 4 weeks. The onset of dormancy coincided with the later stages of seed dehydration and coat-hardening. Over 90% of the mature seeds imbibed water and germinated when incubated at 35 C after 4 months dry storage at 25 C. A puncture through the seed coat, either over the radicle or cotyledons, permitted water imbibition by all mature seeds, but the puncture over the radicle was significantly more effective in inducing germination. Seed coat impermeability was important, but was not the only factor responsible for prickly sida dormancy.

scholarly journals Optimalization of multiresidue method for the determination of pesticide residues in fruits

2021 ◽  
Vol 61 (3) ◽  
pp. 221-238
Keyword(s):  
Water Content ◽  
Pesticide Residues ◽  
High Water ◽  
High Water Content ◽  
Detector Response ◽  
Wide Range ◽  
Comprehensive Determination ◽  
Selective Detectors ◽  
Active Substances

The main aim of this study was to optimize the QuEChERS methodology for the comprehensive determination of pesticide residues using a simple and inexpensive gas chromatography equipped with selective detectors working simultaneously (GC-ECD/NPD). The method was validated in accordance with the SANTE/11945/2015 guidelines. Representative fruit matrices were chosen from the commodities group with high water content (apples), and with high acidity and high water content (strawberry) for a 160 compounds in the range of 0.005−0.02 mg/kg. The accuracy of the method was as required (recovery: 70–120%, precision: below 20%) for 135 active substances in apples samples and 137 in strawberries samples. The main advantages of the methodology include: good detector response linearity (R2 above 0.995), low limits of detection (0.005 mg/kg for more than 20 compounds, 0.01 mg/kg for about 120 compounds), possibility of simultaneous determination of a wide range of compounds (including some “difficult” ones) without use of a single residue methods. The simultaneous use of two selective detectors allows to obtain more data during a single dose of the sample and confirmation of the result for most compounds, which allows to prevent false positives ones.

THE EFFECT OF SEED MATURITY, STORAGE ON THE SOIL SURFACE, AND BURIAL ON SEEDS OF Thlaspi arvense L.

1984 ◽  
Vol 64 (4) ◽  
pp. 961-969 ◽  
Author(s):  
L. HUME
Keyword(s):  
Seed Coat ◽  
Coat Color ◽  
Soil Surface ◽  
Storage Conditions ◽  
Seed Coat Color ◽  
Thlaspi Arvense ◽  
Seed Maturity ◽  
Immature Seeds ◽  
Mature Seeds ◽  
Days After Anthesis

The development and germination of immature stinkweed (Thlaspi arvense L.) seeds were investigated under greenhouse and field conditions. In the greenhouse test, there was nearly 100% germination of seeds with a maturity of 15–16 days after anthesis. Seeds from clipped plants buried at 8 cm for 2–5 wk were lighter in weight than either seeds from plants clipped and stored on the soil surface or seeds collected immediately after clipping. Storage conditions influenced both seed coat color and dormancy. Mature seeds from plants stored on the ground turned dark reddish brown, while those from plants stored under the soil turned black. Storage under either set of conditions decreased the dormancy of stinkweed seeds compared to the controls. The more mature seeds from the field-grown populations were more dormant than those from plants grown in the greenhouse, and had slower germination rates. Immature green seeds only 6 days past anthesis were capable of germinating and producing seedlings. It is suggested that for control of stinkweed plants, cultivation should be carried out within 6 days following anthesis of the first stinkweed flowers.Key words: Immature seeds, stinkweed, dormancy

Fluorescence sensors for detection of water based on tetraphenylethene–anthracene possessing both solvatofluorochromic properties and aggregation-induced emission (AIE) characteristics

2021 ◽  
Vol 45 (9) ◽  
pp. 4164-4173
Author(s):  
Yuta Mise ◽  
Keiichi Imato ◽  
Takashi Ogi ◽  
Nao Tsunoji ◽  
Yousuke Ooyama
Keyword(s):  
Water Content ◽  
High Water ◽  
Fluorescence Sensor ◽  
High Water Content ◽  
Fluorescence Sensors ◽  
Aggregation Induced Emission ◽  
Emission Enhancement ◽  
Wide Range ◽  
Water Based

TPE-(An-CHO)4 has been developed as an SFC (solvatofluorochromism)/AIEE (aggregation-induced emission enhancement)-based fluorescence sensor for detection of water over a wide range from low to high water content regions in solvents.

scholarly journals Oxidation Lipid on Fish Cake Catfish (Pangasius sp.) Dissolved in The Extract of Bay Leaf (Eugenia polyantha)

2020 ◽  
Vol 8 (3) ◽  
pp. 91
Author(s):  
Mahiastuti Tribuana Tungga Dewi ◽  
Boedi Setya Rahardja ◽  
Agustono Agustono
Keyword(s):  
Water Content ◽  
Natural Antioxidants ◽  
High Water ◽  
Experimental Methods ◽  
Quality Score ◽  
High Water Content ◽  
Antioxidant Compounds ◽  
White Meat ◽  
Wide Range ◽  
Significant Difference

Catfish (Pangasius sp.) As a source of animal protein. Fish catfish have a thick white meat so that it can be processed into a wide range of diversified products. The process of fried fish cake can result in fat or autooxidation process. Autooxidation can be inhibited by the presence of antioxidant compounds. One source of natural antioxidants are bay leaf Eugenia polyantha.This research was carried out by experimental methods and the use of experimental design of randomized Complete Design (RAL). RAL is used when the material and condition of the experiment are homogeneous. This research consists of four concentrations of extract treatment bay leaf, namely 0%, 10%, 20%, 30%. Fish cake has been fried done soaking for 30 minutes. Water content showed no significant difference (p> 0.05) at 24 hours to 28, this indicated that the addition of bay leaf extract did not affect the moisture content during storage. The high water content at 0 hour is caused by the process of soaking the fish cake  in the extract solution. The highest value is shown by the concentration of 30% at the hour to 0 that is 52.78%, this indicates that the fish cake by soaking can meet the quality score SNI 7757:2013 which is a maximum of 60%. The fat content in the fish cake continues to decrease, indicating the occurrence of oxidation during storage. Levels of TBA in fish cake continue to increase that can be slowed by the extract of bay leaves with a concentration of 30%.

scholarly journals Chlorophyll Fluorescence Sorting Method to Improve Quality of Capsicum Pepper Seed Lots Produced from Different Maturity Fruits

HortScience ◽  
2013 ◽  
Vol 48 (8) ◽  
pp. 965-968 ◽  
Author(s):  
Burcu Begüm Kenanoglu ◽  
Ibrahim Demir ◽  
Henk Jalink
Keyword(s):  
Chlorophyll Fluorescence ◽  
Seed Quality ◽  
Seedling Emergence ◽  
Seed Vigor ◽  
Harvest Dates ◽  
Immature Seeds ◽  
Controlled Deterioration ◽  
Non Destructive ◽  
Mature Seeds

This work was conducted to investigate the efficacy of chlorophyll fluorescence (CF) sorting to improve seed germination, seedling emergence, and vigor of seeds produced from different maturity fruits of four different cultivars. Four harvest dates from each cultivar were evaluated by harvesting orange (immature), bright red (half-mature), dark red (mature), and dark red and soft (overmature) fruits. Seeds were either sorted or nonsorted after harvesting and standard laboratory germination, seedling emergence, and controlled deterioration tests were conducted. CF sorting significantly increased laboratory germination, seedling emergence, and seed vigor. Maximum improvements were obtained from seeds harvested from half-mature and mature stages. Mean germination improvement among cultivars between CF-sorted and nonsorted seeds were 14% in the immature seeds, 11% in half-mature seeds, 6% in mature seeds, and 9% in overmature seeds. Improvements in seedling emergence were 21%, 17%, 9%, and 10% and 4%, 11%, 10%, 14% for seed vigor (CD germination) in the all maturity stages of seed lots, respectively. CF has the potential to upgrade seed quality in pepper lots as a non-destructive sorting technology.

scholarly journals Induced mutagenesis for improving water stress tolerance in durum wheat (Triticumturgidum L. subsp. durum)

2021 ◽  
Vol 234 ◽  
pp. 00107
Author(s):  
Meryem Elyadini ◽  
Abdelkarim Guaadaoui ◽  
Souad ElHajjaji ◽  
Najoua Labjar ◽  
Mustapha Labhilili ◽  
...  
Keyword(s):  
Water Stress ◽  
Durum Wheat ◽  
Stress Tolerance ◽  
Water Deficit ◽  
Crop Productivity ◽  
Limiting Factors ◽  
High Water Content ◽  
Crop Species ◽  
Water Stress Tolerance ◽  
Wide Range

Over the Water deficit is considered to be one of the most important limiting factors for crop productivity worldwide. Thus, it is important to use water resources more efficiently. One of the ways to conserve water and respond to the climate change is by using appropriate crop species and cultivars, notably which have low requirements for water.Chemical mutagens have contributed immensely to the development of a wide range of genetic variability and the improvement of several crop plants, including durum wheat. This study has the aim of understanding the effect of water stress on some morpho-physiological parameters and identifying tolerant lines to water stress from an EMS-mutated population in durum wheat. The results, under moderate (T1) and severe (T2) conditions of water stress,show the positive effect of mutagenesis on the population resulting in tolerantmutated linesto water deficit. Compared to the non-mutated, 32.15% of lines have a higher specific leaf weight; 57.14% of lines have a better ability to maintain a high water content and 75% of all lines demonstrate a very high intensity of chlorophyll fluorescence .In sum, this study has revealed the improvement of water stress tolerance in some induced durum wheat mutants.

Evaluation of an Immunoisolation Membrane Formed by Incorporating a Polyvinyl Alcohol Hydrogel within a Microporous Filter Support

1997 ◽  
Vol 6 (6) ◽  
pp. 585-595 ◽  
Author(s):  
Andrew R. Baker ◽  
Ronald L. Fournier ◽  
Jeffrey G. Sarver ◽  
Jennifer L. Long ◽  
Peter J. Goldblatt ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Content ◽  
Structural Integrity ◽  
High Water ◽  
Membrane Properties ◽  
High Water Content ◽  
Hybrid Hydrogel ◽  
Wide Range ◽  
Pva Hydrogel

An immunoisolation membrane formed by incorporating a high water content polyvinyl alcohol (PVA) hydrogel into a microporous polyether sulfone (PES) filter has been investigated in this study. The PVA hydrogel is formed in situ within the filter pores via glutaraldehyde (GA) crosslinking under acidic conditions. The tortuous nature of the microporous filter pores securely anchors the embedded hydrogel to provide excellent structural integrity. The high void fraction of the PES filter support (>80%) and high water content of the PVA hydrogel (>85% water by weight) allow excellent solute transport rates, while an appropriate level of glutaraldehyde crosslinking supplies the required molecular size selectivity. In vitro permeability measurements made with solutes covering a wide range of molecular sizes demonstrate high transport rates for small nutrient molecules with rapidly diminishing permeabilities above a molecular weight of approximately 1,000 Dalton. Implantation experiments show that the membrane properties are not deleteriously affected by prolonged in vivo exposure or common sterilization techniques. Thus, this hybrid hydrogel/filter membrane system offers a promising approach to the immunoisolation of implanted cells.

Evaporative water loss and the role of cocoon formation in Australian frogs

1998 ◽  
Vol 46 (5) ◽  
pp. 405 ◽  
Author(s):  
Philip C. Withers
Keyword(s):  
Water Content ◽  
Water Loss ◽  
High Water ◽  
Linear Increase ◽  
Evaporative Water Loss ◽  
High Water Content ◽  
Evaporative Water ◽  
Wide Range ◽  
Very High

Measurements of evaporative water loss (EWL; mg min-1) and resistance (R; sec cm-1) for various Australian frogs indicate three general allometric patterns: non-cocooned and non-‘waterproof’ frogs with EWL ∝ Mass0.30 and R independent of body mass at about 1–3 sec cm-1, cocooned frogs with EWL reduced about 50–200-fold and R about 50–200 sec cm-1, and ‘waterproof’ frogs with EWL reduced about 5–100- fold and R about 5–100 sec cm-1. Cocooned frogs have an exponential reduction in EWL and fairly linear increase in R over time, corresponding to the temporal addition of layers to the cocoon. The biophysical properties of cocoon are generally similar for various species, although there is some variation in both resistance per thickness (5–20 × 104 s cm-2) and diffusion coefficient (0.4–2.4 × 10 –5 cm2 s-1). The hygroscopic property of frog cocoon resembles that of mammalian stratum corneum, hair and wool, and mucopolysaccharides; there is a slight increase in water content of cocoon over a wide range of humidities but a very steep increase in water content and substantial hydration and swelling at >96% RH. This extreme hygroscopic behaviour of frog cocoon at very high RH may reflect less polymer cross-linking in frog cocoon and its high digestibility. The prevention of over-hydration of frog cocoon in vivo may be attributed to the restriction of high water content to only very high RH (>96%).

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