Priming is done by soaking the seed in a liquid, allowing the seed to swell and begin the initial stages of germination. If using a nutrient in your priming solution, it will be absorbed into the seed with the liquid. Coating is usually done as a 'dry' process, with the aim of providing some sort of benefit (nutrients, beneficial organisms etc) to the germinated seedling. Since the seeds are not left to soak in a liquid for coating, the nutrients aren't drawn up into the seed but are left as a dry powder/coating on the outside of the seed.

Well, as far as I understand the process anyways.

Dear Sareh,

Priming is a process that allows soak the seed in a wet solution before germination begins, regardless of the elements which you choose to test solution (nutrients, chemicals ...).

Seed coating is the addition of chemicals to protect the seed from external damage or improve the germination with a film of external chemicals.

If you need further information I suggest you the URLs:

http://www.seedbiology.de/seedtechnology.asp

http://botany.about.com/od/BotanyLesson/a/Seed-Priming-Speeding-Up-The-Germination-Process.htm

http://www.seedquest.com/keyword/seedbiotechnologies/primers/seedenhancement/seedcoating.htm

Best regards.

usually, in seed coating, we just focus on treating coat of seed by using fertilizer, some kinds of clay, etc.  but in priming we affected all parts of seed with our treatment. Coating can be used for increasing store time or survival in nature, but priming  mainly affect seed germination.

Type the word priming in the Wikipedia and all the definitions available will be easily in  your hands. Otherwise, I have to search for my copy that is not available right now.

Good luck.

José Walter P. Carneiro.

Priming may refer to:

• Priming (agriculture), a form of seed planting preparation, in which seeds are soaked before planting

• Priming (immunology), a process occurring when a specific antigen is presented to naive lymphocytes causing them to differentiate either into armed effect or cells or into memory cells

• Priming (media), a cognitive process in which media information increases temporarily the accessibility of knowledge units in the memory of an individual

• Priming (microbiology), the effect that nutrients have on the rate of organic matter decomposition.

• Priming (psychology), a process in which the processing of a target stimulus is aided or altered by the presentation of a previously presented stimulus

• Priming (science), a process of cleaning and preparing equipment before experimentation

• Priming (steam locomotive), a harmful condition in which water is carried over from the boiler of a steam locomotive

• Priming (structural) in psycholinguistics, a form of positive priming that induces a tendency to repeat or more easily process a sentence that is similar in structure to one previously presented

• Priming beta-ketosynthase in chemistry, a domain of polyketide synthases with a thiol group on a cysteine side-chain

• The process by which a pump is filled with fluid and made able to operate

• Priming the pump or economic stimulus, attempts to use monetary or fiscal policy to stimulate the economy

• Priming sugar or glucose, a simple monosaccharide found in plants

Negative priming is an implicit memory effect in which prior exposure to a stimulus unfavorably influences the response to the same stimulus. It falls under the category of priming, which refers to the change in the response towards a stimulus due to a subconscious memory effect. Negative priming describes the slow and error-prone reaction to a stimulus that is previously ignored.[1] For example, a subject may be imagined trying to pick a red pen from a pen holder. The red pen becomes the target of attention, so the subject responds by moving their hand towards it. At this time, they mentally block out all other pens as distractors to aid in closing in on just the red pen. After repeatedly picking the red pen over the others, switching to the blue pen results in a momentary delay picking the pen out (however, there is a decline in the negative priming effect when there is more than one nontarget item that is selected against[2]). The slow reaction due to the change of the distractor stimulus to target stimulus is called the negative priming effect.

Negative priming is believed to play a crucial role in attention and memory retrieval processes. When stimuli are perceived through the senses, all the stimuli are encoded within the brain, where each stimulus has its own internal representation. In this perceiving process, some of the stimuli receive more attention than others. Similarly, only some of them are stored in short term memory. Negative priming is highly related to the selective nature of attention and memory.

Broadly, negative priming is also known as the mechanism by which inhibitory control is applied to cognition. This refers only to the inhibition stimuli that can interfere with the current short term goal of creating a response.[3] The effectiveness of inhibiting the interferences depends on the cognitive control mechanism as a higher number of distractors yields higher load on working memory. Increased load on working memory can in turn result in slower perceptual processing leading to delayed reaction. Therefore, negative priming effect depends on the amount of distractors, effectiveness of the cognitive control mechanism and the availability of the cognitive control resources.[4]

Priming is a cleaning and preparation process that involves cleaning scientific equipment with the same liquid chemical it will come into contact with during the experiment. During scientific experiments that require high levels of accuracy and involve liquid chemicals, the equipment that will come into contact with the liquid chemicals is primed. The process is used to minimize contamination and therefore obtain results that are more accurate.

When cleaning equipment it is near impossible to remove all the loose molecules. It is almost certain that traces of the chemical used to clean the equipment will remain on its surfaces, forming a microscopically thin layer.

The advantages to priming are best demonstrated with an example. Say a known quantity of concentrated hydrofluoric acid was needed for an experiment, and this quantity was measured out in a measuring cylinder cleaned with water. Concentrated hydrofluoric acid reacts violently with water; the products would then contaminate the experiment. This reaction is very exothermic, and would warm the quantity, perhaps creating other problems, for example, if the experiment had been carried out under standard conditions. Priming the equipment, in this case using concentrated hydrofluoric acid, would minimize such problems.

This process is also used in engineering and mechanics to avoid contamination, particularly in hydraulic systems, for example, braking systems in cars.

Condicionamento fisiológico e vigor de sementes de maxixe

Paulo Costa AraújoI; Salvador Barros TorresII; Clarisse Pereira BeneditoIII; Emanoela Pereira de PaivaI

Para o hidrocondicionamento, os três lotes das duas cultivares foram embebidas entre duas camadas de papel toalha, com quantidade de água destilada equivalente a 2,5 vezes o peso do substrato seco, a temperatura de 20 ºC, até atingirem 33,5% de água (Nordestino, após 24 horas) ou 36,6% (Do Norte, após 18 horas). Para determinar o teor de água foi utilizado o método da estufa a 105 ºC ± 3 ºC durante 24 horas (Brasil, 2009). A secagem das sementes foi realizada em temperatura ambiente (28-30 ºC) e umidade relativa do ar de 45-55%, até atingirem teores próximos aos iniciais (7,0-8,5%). Parte das sementes hidrocondicionadas não foi submetida à secagem, enquanto as testemunhas permaneceram com o teor inicial de água, conforme descrito anteriormente.

Good luck,

jwalter

1. The definitions and functions of seed treatments such as 'Seed Priming' and 'Seed Coating' have been discussed above.

2. For the second part of your question (the mechanism): Seeds imbibe water due to (1) Low water potential. Seeds typically possess extremely low 'water potential', sometimes as low as -400 Mpa. So, during Priming, when seeds meet water, imbibition occurs. Imbibition is a physical process not dependent on metabolic energy, and (2) Proteins are zwitter-ions that exhibit both negative and positive charges that attract the highly charged polar water molecules. Water can carry the nutrients into the seeds through imbibition if the nutrients are dissolved in the water. See attached paper for further info (marked (14) and (15)).

Dear Sareh, 

Kindly get through this paper, you will find answer to your questions

Chapter Rice Seed Invigoration: A Review

Dear Sareh

I think you have found your answer from the invaluable comments above but I think the seed coating is applied only on the surface of the seed but in different kinds of priming the material is absorbed by seed (even if the material is water) and its vigor for  germination and emergence and will improve. As you know different kinds of priming are common among them are halo- priming, hydro- priming and ...

Priming is an osmotic conditioning of seeds with an osmotic potential between -0.8 to -2.0 MPa in phases 1 and 2 of the germination process. The priming of seeds can increase tolerance to high salinity in water and soil.

In contrast, the other seed treatment is to provide other benefits, such as facilitating sowing Rhyzobium bacteria type, etc.

Another thing that I would like to add to all the valuable comments is that seed coating can be also applied in very small seeds or seeds with irregular shape (i.e. seeds of beta or brassica) in order to facilitate mechanical sowing.

Thanks to all for the valuable responses.

in seed coating nutrients are only sticking outside the seed, which is available once the seed in soil for germination while in case of seed priming seeds are soaked in the nutrient solution prior to sowing for a particular time duration so by doing this nutrients penetrate in the seeds along with water. hope answer your question

Seed priming is also done as one of the agronomic management strategy to overcome heat stress by soaking seeds in osmotic solution for several days at moderate temperature and then allowed to dry which prevents radicle emergence.

priming is means to interfere in the process of absorbing water and increasing the absorption of water by the seed,  but seed coating is means to add material to the seed Shell to correct the shape of the seed or..........

Sareh,

Please see my paper in Researchgate: Seed priming

Best regards. Walter

Seed priming is also done as one of the agronomic management strategy to overcome heat stress by soaking seeds in osmotic solution for several days at moderate temperature and then allowed to dry which prevents radicle emergence.

Seed priming is the process of controlled hydration of seeds to a level that permits pre-germinative metabolic activity to proceed, but prevents actual emergence of the radicle.

After priming, the seeds were removed from the solutions and shade dry to bring back its original moisture content.

Hello

  If minerals are placed on the seed shell

  It is said to cover seeds or seed coating and it is a kind of seed enhancement.

hello

for more about priming  refer to my paper entitled "Mohajeri, F. Taghvaei, M. Ramrudi, M. Galavi, M. 2016. Effect of priming duration and concentration on germination behaviors of (Phaseolus vulgaris L.) seeds. International Journal-Ecology, Environment and conservation. 22(2). 603-609."

Thank you dear Prof Taghvaei

Nobody here mentioned biopriming...

Seed coating is the practice of covering seeds with external materials to improve handling, protection, and, to a lesser extent, germination enhancement and plant establishment.Here, we analyse the science and industry of seed coating and its contribution to seed establishment and plant performance.

The priming process regulates the seed's temperature and moisture content, bringing the seed closer to the point of germination. The process involves advancing the seed to an equal stage of the germination process, to enable fast and uniform emergence when planted.

Seed priming is an old experimental tactic employed by farmers since eras to enhance germination activities in crop plants. Biopriming of seeds with microorganisms not only improve the growth and development of plants by regulating several biochemical and physiological processes but also impart stress tolerance and resistance mechanisms in plants.

Types of priming:

1. Hydropriming

2. Osmopriming

3. Halopriming

4. Matrixpriming

5. Nanopriming

6. Biopriming