scholarly journals Physiological quality of osmoprimed Eremanthus erythropappus (D.C.) MacLeish seeds

2020 ◽  
Vol 13 (5) ◽  
pp. 18
Author(s):  
A. M. S. Oliveira ◽  
A. A. Silva ◽  
M. C. Vasconcelos ◽  
J. A. A. Granja ◽  
J. M. R. Faria ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Germination Rate ◽  
Seed Priming ◽  
Potassium Nitrate ◽  
The Other ◽  
Other Substances ◽  
Physiological Quality ◽  
Glycol Solution ◽  
Polyethylene Glycol 6000

Physiological conditioning is a technique that consists in controlling the speed of water uptake by seeds, with osmotic solutions, aiming to improve their quality, reducing time and increasing germination rate. Eremanthus erythropappus (D.C.) MacLeish seeds were subjected to priming with polyethylene glycol 6000 (PEG), potassium nitrate (KNO3) and the combination of the two at the concentrations of 0.4; -0.8; -1.0; -1.2 and -1.4 MPa for four, six and eight days. Germination, germination speed index (GSI), emergence, emergence speed index (ESI) and expression of superoxide dismutase (SOD), catalase (CAT) and peroxidase (PO) enzymes were assessed. E. erythropappus seed priming in polyethylene glycol solution with potentials between -0.8 MPa and -1.4 MPa is not satisfactory because it adversely affects germination and reduces the activity of peroxidase and catalase enzymes. The other substances were not significant so there is a need for further research with other substances and / or concentrations

scholarly journals Cryopreservation of primed tobacco seeds

2018 ◽  
Vol 40 (4) ◽  
pp. 415-421
Author(s):  
Camila Aparecida Lopes ◽  
Maria Laene Moreira de Carvalho ◽  
Ana Cristina de Souza ◽  
João Almir Oliveira ◽  
Dayliane Bernardes de Andrade
Keyword(s):  
Seed Germination ◽  
Ambient Temperature ◽  
Silica Gel ◽  
Saline Solution ◽  
Seed Priming ◽  
Potassium Nitrate ◽  
Water Bath ◽  
Tobacco Seeds ◽  
Physiological Quality

Abstract: Priming is a commercial technique used to increase the speed and uniformity of seed germination. However, the physiological quality of primed seeds is usually negatively affected during storage. Tobacco seeds of the cultivar BAT 2101 were used to investigate whether primed seeds could be cryopreserved. The most suitable substances, type of drying, and reheating during priming and cryopreservation of tobacco seeds were studied. Seed priming was performed with water, spermidine, and potassium nitrate, and drying was carried out with silica gel and a saturated saline solution. Seeds were cryopreserved in liquid nitrogen for 24 h and reheated in a water bath for two and five minutes and at ambient temperature. Tobacco seeds primed with spermidine and water can be cryopreserved without loss of physiological quality when quickly dried on silica gel and reheated in a water bath for two minutes.

scholarly journals Physiological quality of seed and seedling performance of crambe genotypes under water stress

2017 ◽  
Vol 21 (3) ◽  
pp. 175-179 ◽  
Author(s):  
Fernando H. B. Machado ◽  
Andréia M. S. de S. David ◽  
Lucas V. S. Cangussú ◽  
Josiane C. Figueiredo ◽  
Hugo T. R. Amaro
Keyword(s):  
Polyethylene Glycol ◽  
Water Stress ◽  
Randomized Design ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
And Performance ◽  
Osmotic Agents ◽  
Polyethylene Glycol 6000 ◽  
Osmotic Potentials

ABSTRACT Water stress is a condition that causes physiological changes in different species and even genotypes of the same species. One of the osmotic agents most used to simulate this condition is polyethylene glycol 6000. The aim of this study was to evaluate the effects of water stress on the physiological quality of seeds and performance of seedlings of crambe genotypes. A completely randomized design was used, in a factorial scheme with two genotypes (one cultivar and one line) and five osmotic potentials simulated with aqueous solutions of polyethylene glycol 6000 (control = 0, -0.25, -0.50, -1.0, -1.50 MPa), with four replicates of 50 seeds per treatment. The effects of the treatments were evaluated by means of germination, first count, germination speed index and fresh and dry matter of seedlings. The physiological quality of seeds and the performance of crambe seedlings are negatively affected under water stress from -0.25 MPa on. Seeds of the genotype FMSCR 1101 have greater tolerance to drought stress, regardless of the osmotic potential used.

scholarly journals Bowel preparation for performing a colonoscopy: prospective randomized comparison study between a low-volume solution of polyethylene glycol and bisacodyl versus bisacodyl and a mannitol solution

2012 ◽  
Vol 49 (2) ◽  
pp. 162-168 ◽  
Author(s):  
Manoel Carlos Vieira ◽  
Claudio Lyoiti Hashimoto ◽  
Flair José Carrilho
Keyword(s):  
Polyethylene Glycol ◽  
Vital Signs ◽  
Abdominal Distension ◽  
Similar Efficacy ◽  
Preparation Methods ◽  
Gold Standard Method ◽  
Mannitol Solution ◽  
Before And After ◽  
Glycol Solution

CONTEXT: Colonoscopy is currently the gold standard method to examine the colon, the rectum and the terminal ileum. In order to perform the colonoscopy, it is necessary to clean the bowel and use medications that are generally poorly tolerated by the patients. OBJECTIVE: Compare the tolerability, acceptability, safety and efficacy of two solutions used for intestinal preparation for a colonoscopy. METHODS: One hundred patients matched for sex and age were prospective randomized into two groups. Polyethylene glycol group received bisacodyl 10 mg plus 1 L of polyethylene glycol the night before and 1 L on the day of the exam. Mannitol group received bisacodyl 20 mg the day before and 1 L of a 10% mannitol solution on the day of the exam. The diet was the same for both groups. Tolerability and acceptability were measured using previously validated questionnaires. In terms of safety, variations in vital signs before and after the preparation were recorded, in addition to any complications. The quality of the preparation was graded based on the Boston and Ottawa scales. RESULTS: Ninety-six percent (96%) completed the study. As for tolerability, the mannitol preparation group exhibited a significantly higher frequency of nausea, vomiting, abdominal pain, and abdominal distension than polyethylene glycol group (P < 0.05). Acceptability was significantly better in polyethylene glycol group. The polyethylene glycol solution has also previously been shown to be safer than mannitol. No difference was observed in the quality of the preparation between the two preparation methods. CONCLUSIONS: The following conclusions can be made: polyethylene glycol solution had higher tolerability, acceptability, and safety than the mannitol and should be used instead of mannitol. Both preparation solutions have similar efficacy.

scholarly journals ELECTRICAL CONDUCTIVITY AND QUALITY OF DIFFERENT UMBEL ORDER CARROT SEEDS

2020 ◽  
Vol 9 (04) ◽  
pp. 75-81
Author(s):  
Luana de Souza Marinke ◽  
Hugo César Rodrigues Moreira Catão ◽  
Gabrielly Fernanda Francisco ◽  
Ítala Menegon Castilho ◽  
Letícia Rodrigues de Oliveira ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Germination Rate ◽  
Statistical Design ◽  
Germination Test ◽  
Aerial Portion ◽  
Initial Characterization ◽  
Different Temperatures ◽  
Physiological Quality ◽  
Final Score

Carrot seeds exhibit irregular vigor due to the wide blooming period of the crop. Results from germination tests are insufficient to evaluate the physiological potential. Thus, vigor tests are used in combination with germination tests. The objective of this work was to evaluate the quality of carrot seeds from different umbel order and the electrical conductivity under different temperatures and imbibing periods. Carrot seeds from cultivar Brasilia were used to perform the experiments. Content of water, the first and the final score of the germination test, index of germination rate, and length of roots and of the aerial portion were determined in the initial characterization. The electrical conductivity test was completed with replicates containing 50 seeds, in 25 mL deionized water at 20, 25 and 30oC. Evaluations were performed with 2, 4, 6, 8, 12 and 24 hours of imbibing period. The experiment was accomplished under a completely random statistical design. The quality of carrot seeds varied according to the umbel order. Seeds of secondary umbels showed better physiological quality. The electrical conductivity test is efficient to evaluate the vigor of carrot seeds with 8 hours of imbibing period at 25°C.

scholarly journals Vigor tests in assessing the quality of signal grass seeds

2017 ◽  
Vol 38 (6) ◽  
pp. 3491
Author(s):  
Paulo Alexandre Fernandes Rodrigues de Melo ◽  
Tatiane Sanches Jeromini ◽  
Carlos Eduardo Affonso ◽  
Edna Ursulino Alves ◽  
Cibele Chalita Martins
Keyword(s):  
Germination Rate ◽  
Pearson Correlation ◽  
Seedling Emergence ◽  
Control Program ◽  
Brachiaria Brizantha ◽  
Quality Control Program ◽  
Market Requirements ◽  
Physiological Quality ◽  
Germination Vigor

The correct assessment of the physiological quality of seed lots is necessary for the quality control program of companies. For such purpose, tests that detect differences in the physiological potential of seed lots and that meet the minimum market requirements. Thus, the study was conducted towards assessing the efficiency of laboratory tests in differentiating the quality of Brachiaria brizantha cv. Xaraés seed lots. Seeds from nine lots were assessed regarding water content, germination, first germination count, electrical conductivity and seedling emergence in sand in the laboratory (normal seedlings, first count and germination rate index), and the results were compared with those from the seedling emergence test conducted in the field. The experimental design used was completely randomized, with four replicates, and the Pearson correlation coefficient between the values from the germination, vigor and field seedling emergence tests was determined. The germination and seedling emergence in sand tests and the seedling emergence rate index efficiently assess the physiological quality of Brachiaria brizantha cv. Xaraés seed lots, providing data similar to those from seedling emergence in the field.

scholarly journals Evaluation of the physiological quality of anadenenthera peregrina (L.) Speg. seeds during storage

2009 ◽  
Vol 33 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Daniel Santos Pinho ◽  
Eduardo Euclydes de Lima e Borges ◽  
Viviana Borges Corte ◽  
Luiz Carlos Bhering Nasser
Keyword(s):  
Electrical Conductivity ◽  
Storage Temperature ◽  
Storage Period ◽  
Seed Priming ◽  
Seed Moisture ◽  
Physiological Quality ◽  
Viable Seeds ◽  
Cold Chamber ◽  
Constant Percentage

The aim of this experiment was to evaluate the effect of storage temperature on the viability and vigour of A. peregrina seeds. Seeds of A. peregrina harvested in Viçosa-MG, in September 2005 were used. The seeds were stored in the Laboratory of Forest Seeds Analysis (LASF) of the Universidade Federal de Viçosa (UFV), in a cold chamber, under approximately 5ºC over150 days. The seeds were stored under 20ºC for 150 days more. Seed moisture was determined after oven-drying at 105 ± 3ºC for 24 hours. The seeds were analyzed monthly using germination, tetrazolium and electrical conductivity tests and Osmopriming during 300 days, with four repetitions of 25 seeds. A. peregrina seeds kept a constant percentage of germination and viable seeds under the tetrazolium test for five months of storage, under either 5ºC and 20ºC. The electrical conductivity test showed significant differences in relation to the storage period, proving to be more sensitive than the standard germination test. Seed priming in PEG -0,4 MPa solution was not efficient in recovering the viability and vigor of the stored seeds at 5ºC and 20ºC.

scholarly journals QUALIDADE SANITÁRIA DE SEMENTES DE Caesalpinia ferrea: INCIDÊNCIA DE FUNGOS, CONTROLE E EFEITOS NA QUALIDADE FISIOLÓGICA COM O USO DE EXTRATOS VEGETAIS

FLORESTA ◽  
2014 ◽  
Vol 45 (1) ◽  
pp. 163 ◽  
Author(s):  
José George Ferreira Medeiros ◽  
Aderson Costa Araujo Neto ◽  
Edcarlos Camilo Silva ◽  
Min Fu Nascimento Huang ◽  
Luciana Cordeiro Nascimento
Keyword(s):  
Seed Germination ◽  
Aspergillus Flavus ◽  
Plant Extracts ◽  
Germination Rate ◽  
Antimicrobial Properties ◽  
Momordica Charantia ◽  
Alternative Control ◽  
Penicillium Sp ◽  
Physiological Quality

As sementes são eficientes meios de disseminação e transmissão de patógenos e, frequentemente, introduzem novos focos de infecção em áreas isentas. A utilização de extratos de plantas com propriedades antimicrobianas são alternativas ecológicas e promissoras para substituir a proteção promovida pela aplicação de fungicidas. Assim, objetivou-se avaliar o efeito dos extratos de alamanda (Allamanda blanchetti L.) e melão-de-são-caetano (Momordica charantia L.) sobre a micoflora e a germinação de sementes de Caesalpinia ferrea. Para tanto, utilizaram-se lotes de sementes coletados em diferentes municípios paraibanos (Areia, Bananeiras, Conde e Remígio), os quais foram submetidos aos testes de sanidade e de germinação. Os tratamentos fitossanitários consistiram de Testemunha; Fungicida dicarboximida (240 g.100 kg-1) e extratos A. blanchetti e M. charantia nas concentrações de 10, 100, 500 e 1000 ppm. Constataram-se os fungos Aspergillus flavus, A. niger, Cladosporium sp., R. stolonifer, Penicillium sp. e Nigrospora sp. nas sementes de C. ferrea. Os extratos de A. blanchetti e M. charantia nas concentrações de 500 e 1000 ppm reduziram a incidência de fungos. As maiores concentrações (500 e 1000 ppm) de ambos os extratos promoveram o aumento no percentual e na velocidade de germinação (IVG), bem como no comprimento das plântulas de C. ferrea.Palavras-chave: Patologia de sementes; micoflora; controle alternativo; germinação. AbstractSanitary quality of Caesalpinia ferrea seeds: incidence of fungi, control and effects on physiological quality with the use of plant extracts. Seeds are efficient to dissemination and transmission of pathogens and often introduce new foci of infection in exempted areas. The use of plant extracts with antimicrobial properties are promising and environmentally friendly alternatives to replace the protection promoted by the application of fungicides. We aimed to evaluate the effect of extracts of Allamanda blanchetti L. and Momordica charantia L. on the mycoflora and seed germination of Caesalpinia ferrea. We used lots of seeds collected in different cities of Paraiba (Areia, Bananeiras, Conde e Remígio), which were tested for germination and sanity. The phytosanitary treatments consisted of control, dicarboximide fungicide (240 g.100 Kg-1) and extracts of A. blanchetti and M. charantia at concentrations of 10, 100, 500 and 1000 ppm. We identified in the seeds of C. ferrea fungi Aspergillus flavus, A. niger, Cladosporium sp., R. stolonifer, Penicillium sp. and Nigrospora sp. The extracts of A. blanchetti and M. charantia in concentrations of 500 and 1000 ppm reduced the incidence of fungi. The highest concentrations (500 and 1000 ppm) of both extracts increased percentage and germination rate (IVG) and length of seedlings of C. ferrea.Keywords: Pathology seed; mycoflora; alternative control; germination.

Mung Bean Germination and Three Different Food Waste Composting Processes

2012 ◽  
Vol 602-604 ◽  
pp. 1135-1139
Author(s):  
Kun Liao Chen ◽  
Jian Liang Chen ◽  
Yun Hwei Shen ◽  
Wun Jiun Guo
Keyword(s):  
Root Growth ◽  
Food Waste ◽  
Mung Bean ◽  
Germination Rate ◽  
Growth Conditions ◽  
The Other ◽  
Kitchen Waste ◽  
Production Methods ◽  
Ideal Situation

This study utilized three different compost production methods, the conventional aerated system (CAS), the anaerobic barrel system (ABS), and the rapid-disposal machine (RDM), and observed the related mung bean germination rates, which are indicators that assess the maturity and quality of compost. All three production methods used the same kitchen waste, and reached maturity after 24 days, 60 days and 5 days, respectively. Mung beans were then seeded to test their germination rates. The results showed that by the fifth day, RDM had the best germination rate, followed by the CAS and ABS. However, the former method had a poor root growth, while the other two had ideal situation root growth conditions. After another five days passed, the roots of the beans grown in the RDM compost started to turn black. At the seventh day, the RDM beans all decomposed. However, the young roots of the beans grown in CAS and ABS compost did not suffer in this way.

scholarly journals Optical Nonlinear Properties of Gold Nanoparticles Synthesized by Laser Ablation in Polymer Solution

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
M. Tajdidzadeh ◽  
A. B. Zakaria ◽  
Z. Abidin Talib ◽  
A. S. Gene ◽  
S. Shirzadi
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Laser Ablation ◽  
Volume Fraction ◽  
Chitosan Solution ◽  
The Other ◽  
Distilled Water ◽  
Nonlinear Properties ◽  
Glycol Solution

In the present study, gold nanoparticles were synthesized in various polymer solutions by means of employing laser ablation technique at the same ablation time. Specifically, gold nanoparticles were synthesized in polyethylene glycol and chitosan solutions, in order to compare the effects of the liquid media which served as stabilizers for particle size and volume fraction of nanoparticles. In addition, this experiment was repeated in distilled water for reference purposes. As the findings indicated, the particle size which was obtained in polyethylene glycol was about 7.49 nm, that is, smaller than those of chitosan solution and distilled water, respectively. In contrast, it was observed that the volume fraction of gold nanoparticles increased in polyethylene glycol in comparison with the other media which indicated an effect on the formation of NPs. On the other hand,Z-scan technique was employed to measure the nonlinear refractive index and nonlinear absorption coefficient of nanofluids containing gold nanoparticles. Consequently, the nonlinear properties of nanofluids pointed to a significant contribution with the number of nanoparticles observed in fluids and both optical nonlinear parameters were observed to increase by means of a prior increase in the volume fraction of Au-NPs in polyethylene glycol solution.

Sign in / Sign up

Export Citation Format

Share Document