domestication & centres of origin of cultivated plants
TRANSCRIPT
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DOMESTICATION & CENTRES OF ORIGIN OF CULTIVATED
PLANTS
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• Domestication• Thepresentdaycultivatedplantshavebeenderivedfromwildweedyspecies.
• Thefirststepinthedevelopmentofcultivatedplantswasdomestication.
• Definition:-domesticationistheprocessofbringingwildspeciesunderhumanmanagement.
• Whichbeganover11000yearsago,whenhumansbeganagriculture.
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• Thefirstdomesticatedplantswerecereals,legumesandotherspeciesusedfortheirfruitsorroots.
• Mostofthecropsweredomesticatedbyprehistorichumans.
• Theyknowinglyorunknowinglyselectedthespecieswhichhasthecharacteristicstheyhaveaccordingtheirneeds.
• Eventuallycropplantsaredivergedfromtheirwildancestralspeciessoremarkablythattheyareclassifiedaswilddistinctspecies.
• Insomecasestheirwildancestorsarenoteaslyidentifiable.
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• Domesticationofwildspeciesislikelytocontinue.
• Anotablecaseofrecentandcontinuingdomesticationrelatestoseveralplantspeciesfortheproductionofbiofuel.
• Eg:-Jatrophacurcas• AmemberofEuphorbiaceaefamily,cultivationisbeingpopularizedsinceoilextractedfromitsseedsisusedtoproducebiodiesel.Thisplatalsohasmedicinalvalue.
• Whichissuplimentedupto5%ofdiesel.
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• Almostallthecharactersofplantspecieshavechangedduetoaccumulationofspontaneousmutations.
• Thecharactersthatshowmoredistinctchangesarethosethathavebeentheobjectsofselectionandarestillplantbreedingobjectivesinmanycultivatedspecies.
• Someimportantchangesthathavebeenoccurredunderdomestication:-
• Eliminationorreductioninshatteringofpods,inmostofthecultivatedspecies.
• Eliminationofdormancyhastakenplaceinseveralcropspecies.Lackofdormancyisaprobleminbarley,wheatetc.
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• Decreaseintoxinsorotherundesirablesubstanceshasoccurredincrops.Thebitterprincipleofcucurbitaceousplantsprovideanexampleofthis.
• Planttypehasbeenmodified.Thecultivatedplantshowsalterdrtillering,branchingleafcharactersetc.
• Decreaseinplantheight,oftenassociatedwithachangefromindeterminatetodeterminatehabitat.
• Insomespeciesanincreaseinplantheightcanbeseen.eg:-jute,sugarcaneetc.
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• Lifecyclehasbecomeshorter.particularlyincropslikecotton(Gossypiumsp.).
• Increaseinsizeofgrainsorfruits.• Increaseineconomicyield.• Inmanycropsasexualreproductionhasbeenpromotedunderdomestication.
eg:-Solanumtuberosum,Ipomeabatatus• Preferenceinpolyploidy,whilecdiploidcounterpartsarepresentinnature.eg:-wheat.
• Shiftinthesexformunderdomestication.inmanydioeciousfruittrees,bisexualformshavedevelopedunderdomestication.selfincompatibilityhasalsobeeneliminatedinseveralcropspecies.
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Centresoforigin• Itisgenerallyacceptedthatcultivatedplantswerenotdistributeduniformlythroughouttheworld.
• Eventodaycertainareasshowfargreaterdiversitythanothersforcertaincultivatedcropsandtheirwildrelatives.
• In1926Vavilovproposedthat,cropplantsareevolvedfromwildspeciesintheareasshowinggreatdiversityandtermedthemasprimarycentresoforigin.
• Later,thecropsmovedtootherareasprimarilyduetohumanactivties;theseareareaswhichgenerallylackrichnessinvariationwhichisfoundinprimarycentresoforigin.
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• Secondarycentresoforigin:-areas,inwhichplantsshowconsiderablediversityofformsalthoughtheydidnotoriginatethere:suchareasarecalledsecondarycentresoforigin.
• TheconceptofcentresoforiginwasgivenbyVavilovbasedonhisstudiesofavastcollectionofplantsattheinstituteofplantindustry,Leningrad.
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Conceptofcentresoforigin• TheconceptofcentersoforiginwasfirstproposedbytheRussianscientistNikolaiVavilov(1887-1943).
• VavilovheadedwhatwastobeeventuallynamedtheVavilovAll-UnionInstituteofPlantIndustryfrom1920to1940.
• Oneofhismissionswastocollectcrop-relatedgermplasmforuseinnationalplantbreedingprojects.
• Duringhisexplorations,Vavilovobservedthatcropdiversitytendstobeconcentratedaroundspecificregions.
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• Heproposedthattheseconcentrationsofhighvariabilityindicatedtheregionswheredomesticationofthesecropsbegan.
• Thisconceptwentagainsttheprevailingviewthatcultivationofplantsstartedrandomlyallovertheworld.
KindsofevdencethatVavilovused;• Archaeological• plantremains• Livingplants• DNA,proteins,morphology,biochemistry• Ecology,distributions• Linguistic:-namesofthecropindifferentlanguages
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• Locatingtheoriginofcropplantsisbasictoplantbreeding.
• Thisallowsonetolocatewildrelatives,relatedspecies,andnewgenes(especiallydominantgenes,whichmayprovideresistancetodiseases).
• Knowledgeoftheoriginsofcropplantsisimportantinordertoavoidgeneticerosion,thelossofgermplasmduetothelossofecotypesandlandraces,lossofhabitat(suchasrainforests),andincreasedurbanization.
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N.IVavilov• NikolaiIvanovichVavilovForMemRSwasaprominentRussianandSovietbotanistandgeneticistbestknownforhavingidentifiedthecentresoforiginofcultivatedplants.
• Born:25November1887,Moscow,Russia• Mainbooks:Fivecontinents,Originandgeographyofcultivatedplants.• Field:botanyandgenetics• Notableawards:Leninprize,Fellowoftheroyalsociety.• Hewasdirectoroftheinstituteofplantindustryfrom1916till1936.• Died:26January1943,Saratov,Russia
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Lawofhomologousseriesofvariation
• LawofhomologousseriesofvariationisproposedbyVavilov.
• Whichstatesthatcharactersfoundinonespeciesalsooccurinotherrelatedspecies.
• Forexample,diploid(2X),triploid(3X)andhexaploid(6x)wheatsshowaseriesofidenticalcontrastingcharacters.
• SimilarlygenusSecaleduplicatesthevariationfoundingenusTriticum.
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• Thusacharacterabsentinaspecies,bitfoundinarelatedspecies,islikelytobefoundinthecollectionsofthatspeciesmadefromthecentresoforigin.
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• EightmaincentresoforiginwereoriginallyproposedbyVavilovin1926.
• Thesecentresare;1)China2)Hindustan3)CentralAsia4)AsiaMinor5)Mediterranean6)Abyssinia7)CentralAmerica8)SouthAmerica
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Thechinacentreoforigin
• Thisregionconsistsofthemountainousregionsofcentralandwesternchinaandtheneighbouringlowlands.
• Atotalof138plantswerelisted.
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Primarycentresoforiginfor;• Glycinemax• Raphanussativus• Colocasiaantiquorum• Panicummiliaceum• Somespeciesofmillets• Fagopyrumesculentum• Papaversominiferum• Secondarycentresoforiginfor;Zeamays,Phaseolusvulgaris,Vignaunguiculata,Sesamumindicum
• Cammelliasinensis• Avenanuda• Brassica• Allium• Solanummelongena• Prunusarmeniaca• Citrus
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TheHindustancentreoforigin• Thiscentreincludes,
Burma,Assam,Malaya,Archipelago,Java,Borneo,SumetraandPhilippines9excludesnorthwestIndia,Punjab,andNorthwesternfrontierprovinces).
• HindustancentreisdividedintoIndoBurmaandIndoMalayansubcentres
• 117specieswerelisted.
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• Primarycentresoforiginfor,• Oryzasativa• Cajanuscajan• Cicerarietinum• Vignaradiata• Cucumissativus• Lactucaindica• Dioscorea• Raphanusindicus• Curcumadomestica
• Saccharum• Gossypium• Cannabisindica• Pipernigrum• Indigofera• Mangiferaindica• Cocosnucifera• Musasapientum
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ThecentralAsiacentreoforigin• IncludesnorthwestIndia(Punjab,Thenorthwest
frontierprovincesandKashmir),allofAfghanistan,ThesovietrepublicsofTadjikistanandUzbekistanandTian–shan.
• ItalsoknownasAfghanistancentreoforigin.• 42specieswerelisted.
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• Primarycentresoforiginfor,• Triticumaestivum• T.compactum• Pisumsativum• Viciafaba• Alliumsatium• Pistachiavera
• Secondarycentresoforiginfor,Secalecereale
• Linumusitatissimum• Carthamustinctorius• Gossypium• Cucurbitamoschata• Daucuscarota• Vitisvinifera
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TheAsiaminorcentreoforigin• ThisisalsoknownastheneareastorPersian
centreoforigin.• ItincludestheinteriorofAsiaminor,thewholeTranscaucasia,IranandhighlandsofTurkmenistan.
• 83specieswerelisted.
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• Primarycentresoforiginfor,• Triticum(9species)• Medicagosativa• Trifoliumresupinatum• Brassicaoleracea• Avenasativa• Alliumsp.• Secondarycentreoforiginfor,Brassicacampestris,B.nigra,B.japonica,B.rapa
• Lactucasativa• Ficuscarica• Punicagranatum• Malussylvestris• Pyrussp.• Prunus• Vitisvinifera
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TheMediterraneancentreoforigin• Manyvaluablecerealsandlegumesareoriginatedfromhere.
• 84specieswerelisted
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• Primarycentreoforiginfor,• Triticumdurum• Triticumdicoccum• Triticumsp.• Avenasp.• Hordeumvulgare• Lensesculeta• Mentasp.
• Lathyrus• Lupinussp.• Trifoliumsp.• Viciasativa• Aspragusofficianalis• Alliumsp.
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TheAbyssiniancentreoforigin• ItincludesEthiopiaandhillcountryofEritrea.• 38plantspecieswerelisted.
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• Primarycentreoforiginfor,• Hordeumvulgare• Triticumdurum• T.turgidum• T.dicoccum• Sorghumbicolor• Pennisetumglaucum• Dolichoslablab• Lathyrussativus• Ricinuscommunis• Coffeaarabica• Allium• Abelmoscusesculentus• Secondarycentreoforiginfor,Victafaba
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ThecentralAmericanorigin• ThisincludestheregionofSouthMexicoandCentralamerica.
• ItisalsoreferredastheMexicancentreoforigin.• 49speciesofplantswerelistedfromhere.
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• Primarycentresoforiginfor,• Zeamays• Phaseolusvulgaris• P.lunatus• Cucurbitamelanosperma• Ipomeabatatus• Cannaedulis• Capsicumannum• Gossypiumhirsutum• G.purpureascens• Caricapapaya• Psidiumguajava• Perseaamericana
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ThesouthAmericancentreoforigin• ThecentreincludeshighmountainregionsofPeru,Bolivia,Ecuador,ColumbiapartsofChileandBrazilandwholeofParaguay.
• Chile-centreandBrazilian-Paraguaycentrearesubcentres
• 45plantswerelistedfromhere.
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Centreofdiversity• Plantsofaspecieslivingindifferentenvironmentarelikelytobedifferent.
• Thusaplantspeciesarelikelytoshowconsiderablevariationinaregionwithvariedclimaticandotherecologicalconditions.
• Areaswithmountainsandvalleysshowvariationinthepreleventenvironment.
• So,plantspeciesalsoshowconsiderablevariationinthisarea.
• Interestinglycentresoforiginaresituatedinmountain-valleyareas.
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• Thuscentresoforiginmaybemoreappropriatelycalledcentresofdiversity.
• Zhukovskyin1965recognised12megagenecentresofcropplantdiversity.
• IndiansubcontinenthavetwohotspotofbiodiversityintheeasternHimalayasandwesternGhats.
• Atleast147agri-horticulturalcropspeciesarebelievedtobeoriginatedfromIndia.
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Diversityinpotato
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DiversityinTriticum
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Diversityinzeamays
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Sinskaya,1969
• Scientistswhomadecontributionsoncentresofdiversity.
• HestudiedonvariationinBarley.• Afterheconcludedthat,overcentuariesandmilleniacultivatedbarleyhasadaptedtodifferentenvironmentalconditionsanddifferenthumanutilisationrequirements.
• Thegenepoolofcultivatedbarleyhasthusaquiredaverylargemorphologicalandadaptivediversity.
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Howcentresoforiginusefulinplantbreeding
• Thestudyofcentersoforiginanddiversityishelpfulinplantbreedingandgeneticresearch.
• Thegeneticvariationinthesecentersoftenservesasarichreserveofgeneticmaterialfortheimprovementofcultivatedcrops.
• Genesfordisease,pestandstressresistance,andnutritionalqualityarejustsomeoftheresourcesthatcanbefoundinthesereserves.
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• Locatingtheoriginofcropplantsisbasictoplantbreeding.
• Thisallowsonetolocatewildrelatives,relatedspecies,andnewgenes(especiallydominantgenes,whichmayprovideresistancetodiseases).
• Knowledgeoftheoriginsofcropplantsisimportantinordertoavoidgeneticerosion,thelossofgermplasmduetothelossofecotypesandlandraces,lossofhabitat(suchasrainforests),andincreasedurbanization.
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Conclusion
• Recentcentreoforigindiscoveringstudiesarecontinuinganditismainlybasedonmoleculartechniques.
• Eachandeveryagro-ecologicalgroupsarebasedonthestudyofhundredsorthousandsofaccessionsfromtheworldcollections.
• Thustheseclassificationofcentresoforiginprovideorientationontheresourcesofaparticularcrop.
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Reference• Singh,B.D.Plantbreedingprinciplesandmethods.kalyani
publishers.2000• Singh,J.&Dhillon,S.S.Agriculturalgeography.TataMcGraw-Hill
publishingcompanylimited.1984• https://books.google.co.in/books?
id=JOcsswWOIscC&pg=PA66&lpg=PA66&dq=sinskaya+1969&source=bl&ots=FIdVKGMGq5&sig=VRzEtA_IB-iEWoZwnD-Pj3mOr7s&hl=en&sa=X&ved=0ahUKEwin5OeB9Y3WAhUCTbwKHdsyAnsQ6AEILjAD#v=onepage&q=sinskaya%201969&f=false
• https://www.google.co.in/search?q=centre+of+origin&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj3sp6v9Y3WAhVEbrwKHegUA9MQ_AUICygC&biw=1366&bih=662
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