what does generic robaxin look like prescription pain pills without acetaminophen alli weight loss pills costco zyvox no prescription beat way to order cozaar aciclovir crema 5 what is the prescription mobic used for noroxin coupon code buying xenical in ireland serophene 100mg flonase drugs online purchases what is teva-atorvastatin used for venlor results forum dipyridamole shoppers drug mart coreg overnight delivery tenormin 100 mg atenolol online cialis sublingual purchase rumalaya shortage 2012 what are the benefits of acai berry capsules prednisone without prescription overnight delivery buying paxil for dogs acne medication doxycycline dosage cephalexin and other drugs generic viagra from india drugstore keppra medicine and pregnancy cymbalta online pay paypal comprar brahmi pela internet canadian pharmacy allegra cost of citalopram canada where to buy isotretinoin buy sildenafil canada eldepryl shelf life cost of kamagra oral jelly without insurance order cefixime overnight cilas marseille france acheter zyrtec ligne is it illegal to order generic probalan how much does an ounce of promethazine codeine cost abilify sales 2011 generic betnovate online amantadine on line for sale no script methotrexate and cytotec for abortion free viagra samples from pfizer pain medicine by mail ordering paroxetine here in canada cefixime and ofloxacin tablets side effects fincar canada overnight delivery grifulvin v for dogs buy can i buy antibiotics from canada discount plavix of canada cialis originale prezzo in farmacia buy nootropil with visa noroxin express canada licensed pharmacy aciclovir ordering avandamet confidence drugstore buy minocycline fast shipping tadapox drug class post cycle therapy vpxl coumadin generic 2013 drugs fucidin 20mg/g ointment estrace cream dosage side effects research grade zithromax meclizine barato how to order claritin online levitra super active buy online ireland long term anxiety medication list get hydrochlorothiazide toronto cheap generic claritin how to order chloramphenicol online ventolin overdose treatment is rumalaya liniment a prescription drug effexor xr dosage information lotrisone to purchase without a prescription metronidazole flagyl side effects canadian pharmacy nitroglycerin carafate prescription coupon tulasi mg buy can you order zyrtec allergy clozaril tablets use prednisolone medicine used artane in croatia non prescription micronase pharmacy order protonix 40 mg deltasone pills sweat can you buy asthma inhalers over the counter anacin tablets uk buy diflucan mg online for pharmaceutical newsletters indian allegra sale ophthacare albendazole drug in canada pharmacy clomid ovulation tests cheapest erection packs 1 paypal lexapro australia companies only order abilify from mexico without prescription aristocort shortage buy cardizem fast shipping adalat over the counter generic paroxetine 20mg for sale buy abortion pill online us discount rumalaya mg kamagra order canada alesse prices at costco buy femara for daily use compare prices prevacid cheap malegra dxt pills synthroid indications usage what does aleve help buy alesse in canada pharmacy how many days to use bactroban online entocort purchase does motrin 800 cause weight gain where to buy tadalafil online drug coversyl side effects rash buying medicine from canada nix dermal cream permethrin 5 zofran shoppers drug mart side effects of clonidine viagra generico online espan~a levothroid tablets uk bystolic cost 5 mg buy zestoretic australia natural erection pills that work liposafe delivery premarin tablets generic name buy kamagra mastercard viagra side effects for old men cefixime indian manufacturer albuterol sulfate 0.083 msds hydrochlorothiazide 25 mg tablet can i crush zithromax tablets cheap us roaccutane without cheap aricept 100 mg uk version of astelin topical erythromycin over the counter micronase from usa diamox by mail order olanzapine overdose toxicity renova tretinoin cream 0.02 buy donde comprar hyzaar order tramadol no prescription cod buy desyrel from india rx relief pharmacy discount card healthcare alliance pariet generic 2013 drugs effects of snorting gabapentin benzac 5 costo toradol with paypal payment betnovate gm cream uses order rumalaya forte overnight compare prices kamagra chewable simon and yasmin le bon buy tretinoin 0 05 visa what does zestril treat buy prevacid cheap antiemetic drugs list uk order synthroid line over the counter triamterene ortho tri-cyclen reviews drugs buy rumalaya capsules online generic avalide albuterol sulfate inhalant solution the little blue pill healthpoint levitra branded where do i vermox in india get flagyl er las vegas cialis and viagra which is better dutas 100mg tablet generic zyvox overnite shipping buy naprosyn for daily use generic alesse 21 canadian baclofen medicines patient oral dosis aciclovir herpes zoster nin~os buy phenergan pills in the uk side effects of omnicef buy requip 100 paxil side effects sleep avapro online in us generic dutasteride 2.5mg cheap voltaren rapid avapro 20 mg cheap us order calan online ed drugs india online pharmacy no prescription buy fosamax capsules is proventil a prescription drug endep fibromyalgia reviews over counter grifulvin v buy viagra professional online from australia deltasone no prescription canada zovirax for purchase km-pcm pharmacy can order ashwagandha canada average length accutane treatment cheap neurontin buy online cheap roxithromycin free delivery what is the correct dosage of cardizem where can i get erythromycin from pastillas cytotec precio en ecuador legal buy sustiva online canada bupropion and birth control pills lipitor 40 mg generic premarin medicinenet cheap 500mg buy amoxil online glucotrol xl from europe where to buy nizoral shampoo hair loss i want to pay some propecia birth family search buy venlor 100 buy sumycin online at canada pharmacy himalaya drug company abana most reliable place to buy xeloda online online pharmacy no prescription fertility can you buy generic norvasc blood tulasi malayalam movie online koala chlamydia outbreak when is generic zyprexa available online levlen purchase half price chloromycetin costco pharmacy himcolin price clorfenamina non prescription styplon pharmacy fluoxetine drug class indian pharmacy motilium cost of claritin at walgreens glucophage 850 mg and pregnancy overseas pharmacy no prescription zestril brand lamisil for sale how to take periactin pills generic from seroquel menosan medicine online moduretic side effect innopran xl prices at costco asacol pills sweat how much does nexium cost in canada tadapox tablets from buy alesse medication ethinyl estradiol generic coversyl 2.5 mg australia canadian online pharmacy for decadron amitriptyline rx propranolol medication interactions normal periods after depo provera atacand prices cvs low dose amitriptyline anxiety antidepressant hydrochlorothiazide on line for sale no script benefits of acai berry diet pills cardura prescription drug noroxin prices at costco how much does singulair cost lioresal tablets 150 mg zocor dose vs crestor dose triderm ointment uses serophene by mail order order actos 4 30mg what is metformin denk 500 used for combivent cost comparison nizagara women buy viagra plus where can i buy it comprar zestril pela internet amoxil drug canadian pharmacy aciphex dosage can you buy kamagra in ireland 100mg pharmacy comprare axis allies anniversary edition starlix side effects long term use where can i buy prevacid chewables is singulair 10 mg chewable depakote comments life viagra salesman buying didronel from canada no prescription med cab sumycin pravachol price india vantin overnight pharmacy prescriptions without prescriptions side effects of abilify 10mg 192 address low cost vasotec cheap india kamagra oral jelly how much will female viagra cost metformin buy canada skelaxin brands india what does generic biaxin look like diltiazem to buy in australia atorlip-10 to buy in england provera without prescription levitra professional comprar doxycycline hyclate uses toothache bactroban cream reviews ordering erythromycin on line how to use cialis effectively no prescription overnight doxycycline online med cab zovirax nymphomax online coupon code canadian asacol tablet mexican pharmacies that ship to us is zetia available over the counter best price for pulmicort retail cost of lexapro what kind of antibiotic is chloramphenicol suhagra dosage instructions how to take flagyl er mg arimidex medication information can you fill a prescription without health insurance zovirax dose cost of ephedraxin without insurance where can i get avalide from how to cancel acai berry order cefadroxil discount voucher syeda generic yasmin reviews how to get lexapro without insurance buy antabuse 100mg online mentat ds syrup canada overnight delivery voveran sr pill shop discount code erexor doctors online cialis cheap what is the drug asacol used for how much is clomid tablets medrol on the internet where to buy acai max cleanse in canada online pharmacies legal uk difene capsules 50mg diclofenac sodium mirapex usa cvs prices blue diamond shaped pill 100 one side buying doxycycline online canada and furosemide omnicef suppositories buy where to buy clomid in canada safely northwest pharmacy canada promo code order aldactone from mexico without prescription duetact uk buy xm radio viagra ad lasix discount voucher what is zovirax made of macrodantin nitrofurantoin capsules buy atorlip-20 without a subscription atarax anxiety ratings what does bupropion do to the brain ???? cialis 50mg 10? comprar sarafem original buy cialis london doxycycline and fish oil non prescription haridra pharmacy 1 man 1 jar best gore dostinex no prescription sale viagra professional drug store online generic alavert cost relafen lawsuit cleocin prices venlor brand positioning viagra reviews forums prescription generic prevacid side effects iv pain meds during pregnancy online forum prescription benadryl order safety of augmentin in pregnancy american aricept generic singulair name buy femora cialis australia generic benicar buy canada order viagra in singapore topshop allegra boots for sale ordering femara mexico what doses does trileptal come in zofran tablets capoten 10 mg cost benicar hct dosage and administration is there any difference between propecia and proscar where to buy cialis in bangkok triamterene side effects prescription drug metformin keppra 1000 mg fiyat? birth control pills crestor viagra buy uk cheap amantadine drugstore com generic nexium uk paypal buy amitriptyline online generic cost of mircette without insurance zyvox 600 mg pharmacy drugstore telmisartan 40mg hydrochlorothiazide 12.5 mg comprar snovitra super power original benicar reviews for men where can i order domperidone online sale ginseng root why is there a shortage of antivert seroquel canada price when can we buy generic plavix order diclofenac sodium can you get free samples viagra buy xeloda online overnight alli tablets us online buying levaquin online alli to buy in the usa without a prescription premarin cream cost cheapest price for yasmin buy alesse boots pharmacy mobic for sale extra sex what is topamax online generic cytotec online generic keftab finpecia shedding lloyds pharmacy body composition monitor avadart spain zantac with no rx natural viagra alternatives food renova cream amazon canadian online pharmacy accutane buy lotrisone 50 glycomet comprar buy naprosyn 200 ordering viagra in china discount minocin diltiazem weight gain no prescription cialis online canada oregon state baseball stadium buy zocor boots benemid tablets side effects online sale of kytril cheap tetracycline antibiotics minimum age for taking viagra what drug category is fosamax 1 pharmacy cheap abilify online where can you buy alli pills lasix dose chf buy zestoretic with no rx allegra uk next day delivery calan canada no prescription no rx needed pet meds cost propecia singapore exelon pharmacy zyprexa without weight gain comprar finasteride online obagi tretinoin 0.1 cream free viagra by mail serious side effects of seroquel compounded prevacid for infants zyrtec 10 mg 20 film tablet prospektu"s can amoxicillin treat chlamydia and gonorrhea resistance prezzo viagra 50 mg farmacia buy atarax cheap allergy sedation drugstore generics buy yasmin pill singapore original shallaki online venlor tablets on line to buy valacyclovir tablets uk costco pharmacy antivert price buy lipitor 20mg clavamox no prescription pletal online in usa buy wellbutrin sr online safely diovan hct shortage requip and compulsive shopping how to get famvir on line cheap kamagra 100mg chewable pil perancang keluarga noriday medicine calander products ordering allegra canada bupropion hcl 100mg tablet alli coupons printable store cheap yagara uk sumycin dosage recommended bupron sr buy on line american estrace albendazole without prescriptions quiero comprar dipyridamole what is the medication antivert used for buy tulasi plant london best pharmacy to order plavix can you buy innopran xl over the counter in germany venta de viagra en mexico df generic phenergan canada retin-a 0,05 sale baclofen usa sale how much will amaryl cost i pill abana website drug forzest cheap price levitra paypal kaufen ordering arava 8 oz promethazine price plendil generic felodipine tablets minipress lawsuit settlements la jolla discount pharmacy fax buy colospa online in usa abc pharmacy in canada rumalaya gel doctors online phexin delivery london doxycycline sunlight malaria risperdal mist canada better than sinequan ditropan buy on line canadian online pharmacy for cafergot order alavert online bactrim u noworodka can you buy kamagra over counter uk lopid reviews for men aristocort online forum click here overnight glucotrol xl online uk citalopram for sale australia where to purchase menosan what does cardizem do for the heart can you get nitroglycerin ointment over the counter plendil for discount order non generic xenical cleocin tablets uses synthroid fast mexico ciali in kawaii land buy generic erexin online no prescription where can i buy alii acheter alliance fable 3 voltaren 50 diclofenac sodium does levlen make you gain weight what is hydrea for can you buy cordarone online zenegra over the counter ginette-35 to buy in england buy baclofen in singapore real viagra paypal cymbalta sales 2011 best ed drug for men where can i get acai buy floxin online from canada can order starlix canada detrol la maximum dose cost of viagra at boots how much does prazosin cost safe buy reminyl online indian steel alliance delhi zyvox no prescription needed buy generic cialis from india flunitrazepam online jo s club 7 protonix order online purinethol for sale chloroquine rx list buy buffered aspirin uk difference between renagel and renvela lidocaine ointment over the counter purchase ophthacare pills lithium price history pharmacy that sells exelon what is claritin used for brand glucotrol xl buy tretinoin 0.1 paypal lithium on line in the canada aqua credit card bank of scotland zithromax capsules azithromycin blood pressure medication isoptin list of tesco stores selling quibron-t order carafate tablets buy cheap drugstore makeup online doxycycline capsules 100mg apo probalan tablets from buy celadrin generico italiano betapace without rx average cost of flomax side effects of ginseng for men buy benfotiamine in singapore best retin a cream for acne pharmacy has best price zithromax betnovate cost side effects of amitriptyline overdose drugs no prescription online order voltaren without prescription actos lawsuit in canada cheap topamax 15 mg clozaril clozapine generic mentax online overnight baclofen order canada vente de vpxl au quebec lisinopril daily use reviews calan online price prednisone dosage rheumatoid arthritis accutane before and after black skin herbal viagra alternative new zealand how to buy levothroid in london ranitidine tablets 300mg metformin medications diabetes when was januvia launched in india amaryl online in uk buy cytoxan with paypal ginseng online sale there generic revatio do i have to be 18 to buy benadryl prilosec over the counter walgreens diarex roche precio argentina abilify generic form buy cheap canadian arimidex without buy mevacor have no prescription baytril for dogs price buy retino a cream 0,025 no prescription why is there a shortage of estrace best drugstore makeup summer 2012 compare prices viagra sublingual dramamine pas cher italie buy sildenafil uk erythromycin antibiotic eye ointment accutane journal 2005 beconase aq no prescription reviews nombre generico del viagra ecuador cialis pas cher canada cymbalta and alcohol consumption side effects tricor 48 mg tablets cholesterol dilantin lowest price periactin more drug_uses pioglitazone and bladder cancer fda stopping bromocriptine side effects med cab innopran xl does mircette cause hair loss nizoral coupons 2011 what does lexapro contain is lexapro for anxiety blopress generico online baby aspirin dose for fertility avodart mg canadian rx list of tesco stores selling ginseng class action lawsuit against plavix frumil without a prescription from canada valtrex without prescription canada ordering amantadine drug for sale lasix online zentel uk boots generic hyzaar 100 25 spc of rosuvastatin tablets buy tadalis sx visa januvia dose aciphex prescription assistance canadian pharmacy himplasia cost of neurontin 300 mg ventolin tablets price seroquel long term usage oxytrol usa plavix generic dosage buy ciplox without rx buy aricept 50 mantras for healthy child procardia delivery uk buy coumadin 40 alli for sale uk can order ralista online order viagra plus medication by mail pure lithium cost cialis daily message boards do you need rx elavil medication for gout allopurinol overseas drugstore does generic prednisone look like costco online coupons lynoral pharmacy prices list can you get brand amoxil purchase generic zithromax prograf price uk pill rx health coumadin products seroquel sleep medication side effects mevacor discount voucher cheap zyvox canadian pharmacy generic zestoretic safe van you buy amantadine canadian buy actoplus met with paypal buying aldactone keppra discontinued procardia cheap price what are prednisone tablets for medrol dose pack drug class best medication for anxiety and ocd buying shuddha guggulu canada order propranolol overnight delivery of lipitor where estrace where can i get prednisolone from viagra extreme side effects allopurinol and warfarin interactions comprar adalat en argentina nitrofurantoin uk next day delivery mycelex-g online in usa sale suhagra cymbalta pill shop discount code cialis from usa best price zoloft 100mg buy accutane 20 caverta limited india clorhidrato sertralina efectos secundarios medrol drug in canada pharmacy lisinopril medication online actos for daily use canada walmart pharmacy viagra price levitra effects last furosemide 40 mg dosage for dogs buy cheap raciper tricor share price yahoo ranitidine bismuth citrate cleocin t usage buy voltaren emulgel uk what is penegra for what use descargar llevate mi tristeza padre chelo buy proventil online cheap top 10 online glucophage sites cardura for sale usa diclofenac gel no prescription compare prices

Recherche

Apprenez à jardiner dans le respect de votre environnement, un site de la SNHF
http://www.

Agapanthus 'Blue Heaven' (La plante du mois)

Jardine avec Bottine et ses amis. de 3 à 11 ans

Amélioration génétique et création de diversité

Graminées pour potéesToutes les espèces, quelque soit le règne auquel elles appartiennent, évoluent de façon permanente. L’agriculture qui remonte à plus de 10 000 ans constitue un facteur important de l’évolution des espèces végétales cultivées. Elle a succédé très progressivement à la cueillette.

Chez les espèces horticoles, principalement chez les espèces ornementales, l’homme a largement utilisé la variabilité naturelle, collectée dans des zones de diversification ou dans des jardins d’acclimatation. Pour les espèces potagères et fruitières, en revanche, la sélection dirigée a très tôt pris une place importante dans la création de variabilité.

Le processus de diversification est un préalable à l'amélioration : la diversité est venue et vient encore de l'introduction et de l’acclimatation, c’est une étape préalable à l'amélioration. Le schéma assez classique est : collecte dans le lieu de diversification, puis mise en culture pour favoriser des approvisionnements réguliers et enfin sélection et éventuellement amélioration quand quelques défauts apparaissent.

L’amélioration des plantes, qui suit la phase de diversification, sur un nombre restreint d’espèces peut être globalement définie comme l’ensemble des activités tendant à "l’ajustement génétique" des plantes au service de l’homme et comme la réalisation de multiples adaptations aux milieux physique, biologique et économique.

Les espèces cultivées ont continué à évoluer au cours des millénaires qui ont suivi les débuts de la domestication. Contrairement à ce qui a pu se passer pour les animaux domestiques, l’Homme est longtemps resté dans l’ignorance des processus de reproduction des plantes. L’idée de créer de nouvelles espèces par hybridation ne viendra qu'au XVIIIème siècle.

Les véritables progrès en sélection vont commencer au XIXème siècle grâce à des précurseurs comme P. Shireff en Ecosse et L. et H. de Vilmorin en France. Ces précurseurs ont élaboré des méthodes de sélection qui sont toujours en pratique. Cependant, ils ignoraient les lois de l’hérédité qui ne seront intégrées à la sélection qu’au début du XXème siècle après la “redécouverte” des travaux publiés par G. Mendel en 1865.

Au cours du XXème siècle, ces méthodes renforcées par la connaissance des lois de la génétique vont déboucher sur la création de très nombreuses variétés améliorées. Dans le même temps, les progrès des connaissances en physiologie végétale, biologie de la reproduction, biologie moléculaire, ont apporté de nouveaux outils aux sélectionneurs, qui les ont alors plus largement utilisés pour augmenter la variabilité, raccourcir le délai de la sélection et rendre celle-ci plus précise et efficace.

Afin de favoriser la création variétale et le développement de nouvelles variétés, à l'initiative de chercheurs et de professionnels français, une réflexion sur un système de protection juridique, applicable au matériel biologique, fut lancée. Ce système a été mis en place par la Convention pour la Protection des Obtentions Végétales signée le 2 décembre 1961 à Paris, par quelques états regroupés au sein de l'Union pour la Protection des Obtentions Végétales (UPOV). Aujourd’hui, 65 pays sont membres de l’UPOV y compris l’Union Européenne.

TELECHARGER L'ARTICLE EN PDF

Yvette Dattée 
Académie d’agriculture Paris
Alain Cadic
INRA Angers
Catherine Ducatillion
INRA Antibes

Colloque scientifique de la SNHF. Mai 2008

acheter les actes du colloque Quand les plantes se parlent