Genetic variation in relation to adaptability of three mangrove species from the Indian Sundarbans assessed with RAPD and ISSR markers-中国期刊网

摘要 Richgeneticpolymorphismisimportantforplantstoadapttochangesbecauseitenablestheplanttomakeanatomical,physiologicalandbiochemicalchangesinresponsetoabioticstress.Geomorphologiccharacteristics,demographicinterferenceandacumulativedecreaseinfreshwaterinfluxintheIndianSundarbansregionhaveproveddetrimentaltosomeeconomicallyimportantplants.Inthisstudy,geneticpolymorphismofthreemangrovespecies,Xylocarpusgranatum,Excoecariaagallocha,andPhoenixpaludosa,wasassessedusingRAPDandISSRmolecularmarkers.X.granatum,alreadyindistressintheSundarbans,hadtheleastgeneticpolymorphism,14.56%intheRAPDanalysisand12.92%intheISSR.RelativelyhighergeneticpolymorphismwasrecordedfortheprofuselygrowingE.agallochaandP.paludosa:24.66and26.4%inRAPD;24.87and20.32%inISSRanalysisrespectively.AUPGMAdendrogramconstructedusingthesimilaritymatrixfromRAPD,ISSRandcombineddatashowedthatforX.granatum,theleastandhighestsalinityzonesclusteredtogether,whereasforE.agallochaandP.paludosa,higherandlowersalinityareasclusteredindifferentclades.Nei’sgeneticdiversity,calculatedfromRAPDandISSRdata,wasalsoinaccordancewith0.0637and0.0583forX.granatum,respectively,muchlowerthan0.0794and0.0818forE.agallochaand0.0799and0.0688forP.paludosa.ThisopposingdegreeofpolymorphismmightbeattributedtotheprofuselygrowingE.agallochaandP.paludosaandprecariousstatusofX.granatumthroughouttheIndianSundarbans.

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Genetic variation in relation to adaptability of three mangrove species from the Indian Sundarbans assessed with RAPD and ISSR markers

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Genetic variation in relation to adaptability of three mangrove species from the Indian Sundarbans assessed with RAPD and ISSR markers

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