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,2016,36(5):0930-0937
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犃狀犪狋狅犿犻犮犛狋狉狌犮狋狌狉犲狅犳犛犲犲犱犆狅犪狋犗狉狀犪犿犲狀狋犪狋犻狅狀犪狀犱犕狌犮犻犾犪犵犲狅犳
犘犲犵犪狀狌犿犿狌犾狋犻狊犲犮狋狌犿犪狀犱犐狋狊犈犮狅犾狅犵犻犮犪犾犃犱犪狆狋犪狋犻狅狀狋狅犛犲犲犱狊
犇犻狊狆犲狉狊犪犾犪狀犱犌犲狉犿犻狀犪狋犻狅狀
CHENXiaocui1,LUJiahui1,2,3,CHENChaonan1,HANChun1,SONGFeng1,NIUQingdong1
(1ColegeofLifeSciences,ShiheziUniversity,Shihezi,Xinjiang832003,China;2TheKeyLaboratoryofOasisEcoagriculture
XinjiangProductionandConstructionGroup,Shihezi,Xinjiang832003,China;3InstituteofLicoriceinShiheziUniversity,Shihezi,
Xinjiang832003,China)
犃犫狊狋狉犪犮狋:Thecharacteristicchangesofmucilaginousseedcoatbeforeandafterwettingwereobservedby
dissectingmicroscopeandscanningelectronmicroscopy.Theeffectsofseedcoatornamentationandmuci
lageonwateruptake,sandadhesion,floatabilityandgerminationofseedswereanalyzed.Theresult
showedthat:(1)Theseedcoatornamentationof犘犲犵犪狀狌犿犿狌犾狋犻狊犲犮狋狌犿 wasformedbyoutwardprotru
dingappendagesontheouterpericlinalwalsofepidermalcelsandpresentedareticularstructure.Peli
clescoveredonthepolyhedralmeshesofseedcoatornamentation,makingthemeshesformclosedcham
bers.Afterabsorbingwater,thepeliclesbecamemucilaginousandalotofbubblesappearedinthemuci
lagechambers.Themucilagewasgradualydissolvedanddisappearedafterwaterabsorptiondehydration.
(2)Themucilagelayerandchambersofseedcanstoremuchair,whichfacilitatedseedfloatationonmoving
waterandfurtherdispersal.Meanwhile,seedcoatornamentationandmucilagecanenhanceadhesiveability
ofseedtothesoilandotherplants,therebyescapingfromseedsbarenesstomaintainseedvigor.Theseed
coatornamentationandmucilagealsocanabsorbalargeamountofwaterquicklyandholdwater,thus
maintainingsoilseedbankintheharshdesert.(3)Themucilaginousseedcoatcandelaygerminationbut
promoteseedlingsgrowthinanunpredictableenvironment,whichincreasingtheabilityofplantestablish
ment.
犓犲狔狑狅狉犱狊:seedcoatmucilage;seedsdispersal;seedsgermination
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Thearrowsrepresentmucilagepelicleonthesurfaceofmeshes.IandK.Thearrowsrepresentbubbles.A,B,E,F,H-I.bar=1mm
Fig.1 Themucilaginousseedcoatformof犘犲犪犵狀狌犿犿狌犾狋犻狊犲犮狋狌犿anditschangebeforeorafterabsorbedanddehydrated
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Fig.2 Timecourseforwaterabsorptionanddehydration
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Table1 Effectsofseedcoatornamentationand
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Fig.4 Effectsofseedcoatornamentationandmucilageon犘.犿狌犾狋犻狊犲犮狋狌犿seedsgermination
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