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Search Results: 1 - 10 of 25934 matches for " seed quality "
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Influence of Date of Transplanting on Growth and Yield Attributes and Resultant Seed Quality of Davana  [PDF]
M. Jayanthi, A. Vijayakumar, K. Vananagamudi, K. Rajamani
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.49210
Abstract:

A field experiment was conducted at TamilNadu agricultural university, Coimbatore during rabi 2011 to study the effect of time transplanting on growth, yield attributes and resultant seed quality of davana. The experiment was laid out with five different dates of transplanting viz., October 15th, November 1st, November 15th, December 1st and December 15th with the spacing of 15 × 7.5 cm and 125:125:75 NPK kg/ha were adopted in a randomized block design with four replications. The results revealed that the seedlings transplanted at 15th November recorded the maximum number of branches/plant, seed yield/plant, seed yield/plot, resultant seed germination and vigour index.

Seed research for improved technologies
Bino, R.J.;Jalink, H.;Oluoch, M.O.;Groot, S.P.C.;
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000500004
Abstract: the production of high-quality seed is the basis for a durable a profitable agriculture. after production, seed is processed, conditioned, stored, shipped and germinated. for quality assurance, seed quality has to be controlled at all steps of the production chain. seed functioning is accompanied by programmed transitions from cell proliferation to quiescence upon maturation and from quiescence to reinitiation of cellular metabolism upon imbibition. despite the obvious importance of these control mechanisms, very little information is available at the molecular level concerning those elements that regulate seed germination. in the present study, the induction of cell cycle activity and the regulation of ?-tubulin expression is related to the water content and other physical properties of the seed.
Seed research for improved technologies
Bino R.J.,Jalink H.,Oluoch M.O.,Groot S.P.C.
Scientia Agricola , 1998,
Abstract: The production of high-quality seed is the basis for a durable a profitable agriculture. After production, seed is processed, conditioned, stored, shipped and germinated. For quality assurance, seed quality has to be controlled at all steps of the production chain. Seed functioning is accompanied by programmed transitions from cell proliferation to quiescence upon maturation and from quiescence to reinitiation of cellular metabolism upon imbibition. Despite the obvious importance of these control mechanisms, very little information is available at the molecular level concerning those elements that regulate seed germination. In the present study, the induction of cell cycle activity and the regulation of -tubulin expression is related to the water content and other physical properties of the seed.
Effects of Genetics and Environment on Fatty Acid Stability in Soybean Seed  [PDF]
Nacer Bellaloui, Alemu Mengistu, My Abdelmajid Kassem
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.49A1024
Abstract:

Although seed oil production and composition are genetically controlled, changes of oil level and oil composition across genotypes and environments such as drought and temperature were observed. The mechanisms of how genotypes interact with environment, affecting oil production and composition, are still not well understood. The objective of this research was to investigate the effect of drought/water stress and temperature on soybean genotypes. Two soybean genotypes of maturity group (MG) II (PI 597411 B and PI 597408) and two of MG VI (Arksoy and PI 437726) were used. A repeated greenhouse experiment to study the effect of water stress and a repeated growth chamber experiment to study the effect of temperature were conducted. The results showed that both water stress and high temperature altered seed oil composition by increasing oleic acid and decreasing linoleic and linolenic acid concentrations. Severe water stress (soil water potential between -150 to -200 kPa) or high temperature (40/33, day/night) resulted in higher palmitic acid and lower stearic acid. Genotypes differed in their responses to water stress or temperature. Analyses of seed carbohydrates (glucose, fructose, sucrose, raffinose, and stachyose) showed a significant decline of glucose, fructose, and sucrose and a significant increase of stachyose concentration by water stress and high temperature. Analyses of natural abundance of δ15N and δ13C isotopes showed changes in sources of nitrogen and carbon fixation, possibly affecting nitrogen and carbon metabolism pathways. The research demonstrated that both water stress and high temperature altered oil production and composition, and this could be partially related to limited availability and movement of carbohydrates from leaves to seed. Further research to investigate the enzymes controlling fatty acids conversion and nitrogen and carbon metabolism is needed.

Ultraviolet-B Radiation Alters Soybean Growth and Seed Quality  [PDF]
K. Raja Reddy, Hrusikesh Patro, Suresh Lokhande, Nacer Bellaloui, Wei Gao
Food and Nutrition Sciences (FNS) , 2016, DOI: 10.4236/fns.2016.71007
Abstract: Research on the effects of ultraviolet-B (UV-B) radiation on soybean seed quality is limited. The objective of this study was to quantify UV-B doses, 0, 5, 10 & 15 kJm2d1, on soybean growth and seed quality. The experiment was conducted in the Soil-Plant-Atmosphere-Research (SPAR) facility. Chambers located at the R.R. Foil Plant Science Research Facility of Mississippi State University, Mississippi, USA, were used. Each SPAR chamber consists of a steel soil bin to accommodate the root system, a Plexiglas chamber to accommodate plant canopy and a heating, and cooling system connected to air ducts that pass conditioned air to cause leaf flutter through the plant canopy. The SPAR units, supported by an environmental monitoring and control systems, are networked to provide automatic acquisition and storage of the data, monitored every 10 seconds throughout the day and night. Soybean cultivar Pioneer 93Y92 (maturity group IV, Roundup Ready) was used in the study. The desired UV-B radiation was supplied by square-wave UV-B supplementation systems under near ambient PAR and delivered to plants for eight hours, each day, from 08:00 to 16:00 h by eight fluorescent UV-313 lamps. The results showed that increased UV-B did not influence many of the growth parameters because the treatments were imposed at mid-fruiting period. Seed quality parameters that are important for seed industry and human and animal nutrition were all affected by UV-B. Protein and palmitic and oleic acids declined linearly, while oil and linoleic and linolenic acid contents increased with increased UV-B. Sucrose, stachyose, and stearic acid contents showed quadratic trends, increased to about 4 - 5 kJ of UV-B and declined at higher doses. Thus, both current and projected UV-B radiation levels can modify soybean growth and seed quality. The functional algorithms developed in this study could be useful to develop UV-B- specific sub-models for soybean farm management and in policy decision areas.
Physiological and Biochemical Characterization of Jiló Seeds (Solanum gilo) in Different Harvest Times  [PDF]
Marcus Vinicius Prado Alves, Edila Vilela De Resende Von Pinho, Heloisa Oliveira Dos Santos, Gustavo Costa Prado Alves, Rucyan Walace Pereira
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.810174
Abstract: The evaluation of seed quality during the development process is important for the definition of the moment of harvest. In this context, the objective in this study was to evaluate the quality of Jiló seeds during development through physiological, biochemical and electrophoretic tests of enzymes. Six genetic materials, JIL white, JIL 001, JIL 005, JIL 006, H1 and H2 were used. Fruits were harvested at 35, 40, 45 days after anthesis (DAA). A total of 50% of all fruits harvested at 45 DAA remained at rest for seven days which were labeled as 45 DAAr. The seeds at each maturation stage were extracted from the fruits and evaluated by water content, weight of one thousand seeds, electric conductivity, germination, germination speed index, seedling emergence, and seedling emergence rate index. The chemical composition of the seeds was also evaluated, as well as the expression of the enzymes esterase, isocitrate lyase, malate dehydrogenase, alcohol dehydrogenase, superoxide dismutase, catalase, peroxidase and endo-β-mannanase. The highest values of germination and vigor were found in seeds harvested at 45 DAA and 45 DAAr, mainly for hybrids H1 and H2. The highest values of lipids and proteins and lower carbohydrates were found in the most immature seeds of Jiló. The enzymes analyzed showed higher expression in the initial stages of development, however reduced with the advancement of the maturation stage. Endo-β-mannanase expression increased with seed development. Jiló seeds harvested at 45 DAAr presented the highest of germination and vigor values. This “being” considered as the ideal harvest point.
Effect of Pansy (Viola x wittrockiana gams) Seeds Colour and Size on their Germination
Rosinska AGNIESZKA,Roman HOLUBOWICZ
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2008,
Abstract: Four commercial seed lots from the Polish seed companies of pansy (Viola x wittrockiana Gams) with low germination capacity were sorted into 2 size fractions: small and large: below 4 mm long and above 4 mm and 3 colour fractions: yellow, brown and dark, using hands and colour catalogue of British Royal Horticultural Society. The seeds were then tested for their germination following the ISTA routine rules. The seed size did not affect neither its energy nor capacity of germination. In one of the seed lots, smaller seeds germinated slightly better than the big ones, but in the two others ones, it was opposite. The smaller seed also gave higher amount of abnormal seedlings in the tests. There was a clear effect of seed colour on the seeds' germination. The dark seeds had the highest germination capacity, whereas the yellow ones - the lowest. The carried out experiments proved that color sorting of pansy seeds can improve their germination, mostly due to eliminating light, immature seeds.
Factors affecting forage stand establishment
Sulc, R.M.;
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000500020
Abstract: significant advances have been made in our knowledge of forage seed physiology, technology, and stand establishment practices; however, stand establishment continues to be one of the most common production problems affecting forage crops in the usa. there is a need for research on stand establishment of forage crops under abiotic and biotic stress. although the forage seed industry produces and markets seed of high quality, new methods of assessing seed vigor are needed and their use should be expanded in the industry to enable matching seed lot performance to specific environmental conditions where performance can be maximized. seed treatment and seed coating are used in the forage seed industry, and studies have shown they are of benefit in some environments. there is an increase in no-tillage seeding of forage crops, but improvements in the no-tillage planting equipment are needed to make them better suited to small seeds. other recent developments in seeding techniques include broadcasting seed with dry granular and fluid fertilizers, which improves the efficiency of the seeding operation.
SEED QUALITY OF SELECTED VEGETABLE SPECIES ON THE POLISH MARKET
Tomasz W. BRALEWSKI,Roman HOLUBOWICZ
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2006,
Abstract: In the years 2001-2003 the seed quality of 108 samples of white head cabbage, garden carrot, red beet, onion, cucumber, tomato, radish, lettuce, common bean and garden pea were checked. They came from 3 Polish seed companies and 1 foreign one operating on the Polish market. It was found out that 22.2% of the examined seed samples did not meet the standards concerning germination capacity. The worst were seeds of lettuce and head cabbage. Their samples did not meet the germination capacity standards in 55.5% and 41.7%, respectively. The best quality was found for seeds of red beet and cucumbers - all their tested samples met the germination capacity standards. The highest number of samples, which did not meet the standards, came from the company number 2, the smallest - from the company number 4. All tested seed samples met the purity standards.
Factors affecting forage stand establishment
Sulc R.M.
Scientia Agricola , 1998,
Abstract: Significant advances have been made in our knowledge of forage seed physiology, technology, and stand establishment practices; however, stand establishment continues to be one of the most common production problems affecting forage crops in the USA. There is a need for research on stand establishment of forage crops under abiotic and biotic stress. Although the forage seed industry produces and markets seed of high quality, new methods of assessing seed vigor are needed and their use should be expanded in the industry to enable matching seed lot performance to specific environmental conditions where performance can be maximized. Seed treatment and seed coating are used in the forage seed industry, and studies have shown they are of benefit in some environments. There is an increase in no-tillage seeding of forage crops, but improvements in the no-tillage planting equipment are needed to make them better suited to small seeds. Other recent developments in seeding techniques include broadcasting seed with dry granular and fluid fertilizers, which improves the efficiency of the seeding operation.
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