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Effects of Manganese Soaking on Wheat Seedling Photosynthetic Characteristics and Root System, Root Vigor

锰素浸种对小麦幼苗光合特性及其根系形态与活力的影响



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,2016,36(4):0745-0750
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MENGXiangping1,2,LIChunxia1,2,GUOHaiyan1,3,DINGRuixia1,2,
YANGBaoping1,2,CAITie1,2,HANQingfang1,2
(1InstituteofWatersavingAgricultureResearchinChineseAridAreas,NorthwestA&FUniversityKeyLaboratoryofCrop
PhysiologicalEcologyandTilageinNorthwesternLoessPlateau,MinisterofAgriculture,Yangling,Shaanxi712100,China;2
ColegeofAgronomy,NorthwestA&FUniversity,Yangling,Shaanxi712100,China;3ColegeofForestry,NorthwestA&F
University,Yangling,Shaanxi712100,China)
犃犫狊狋狉犪犮狋:Inordertoclarifytheeffectsofdifferentconcentrationsofmanganese(Mn)soakingonphotosyn
thesis,rootsystem,rootvigorandbiomassofwheatseedling,thispaperperformedpotexperimentatthe
fourmanganesegradientsof0g/L,0.03g/L,0.06g/Land0.12g/L,usingwheatvariety‘Xinong979’as
thematerial.Theresultsshowedthat:(1)Withintherange0-0.06g/LofMnsoaking,thephotosynthet
icpigment,netphotosyntheticrate(犘n),stomatalconductance(犌s)andwateruseefficiency(WUEL)of
leafwereenhancedandintercelularCO2concentration(犆i)wasdeclinedwithincreasingMnamount.A
mongthem,thepromotioneffectof0.06g/LofMnsoakingwasmostlyobvious;whenMnapplication
levelwashigherthan0.06g/L,thetrenddeclinedin犘n,transpirationrate(犜r),犌s,犆i;(2)Totalroot
length,surfacearea,rootvolume,rootvigorwerethegreatestinwheatseedlingsunder0.06g/Ltreat
ment,whichwasshowedsignificantdifferencestocontrol;(3)Thetrendofupgrounddryweight,root
androotshootratiosinwheatseedlingsappearedassinglepeakcurves,whichwasthegreatestunder0.06
g/Ltreatment.Moreoveritshowedsignificantdifferencestocontrol.Ingeneral,appropriateconcentra
tionMnsoakingcouldimprovethefunctionofwheatleafphotosyntheticcapacityanddevelopmentofroot
underseedlingstage.However,soakingwheatseedsbyhigherconcentrationMn,woulddecreasegrowth
ofwheatseedling.Thereforeinacomprehensiveconsiderationofphotosyntheticcharacteristics,rootsys
temandbiomass,weproposethattheoptimalmanganesesoakingconcentrationis0.06g/Linthelocal
withlackofmanganese.
犓犲狔狑狅狉犱狊:manganese;soaking;wheat;seedlingstage;root;photosynthetic
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Fig.1 Thephotosyntheticpigmentcontentsofwheatleaf
underdifferentconcentrationsofMnseedsoaking
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Table1 ThephotosyntheticparametersunderdifferentconcentrationsofMnseedsoakinginwheatleaves
ÉlTreatment
¯’“°±犘n
/(μmol·m-2·s-1)
³´X^犌s
/(mol·m-2·s-1)
µ¶CO2Œ^犆i/
(μmol· mol-1)
ÃÄ°±犜r
/(mmol·m-2·s-1)
e»¼xL± WUEL
/(μmol· mol-1)
CK 15.43±0.78b 0.213±0.038b 300±14.73a 3.05±0.30a 5.08±0.33c
T1 16.51±0.68b 0.224±0.023ab 295±14.42a 3.04±0.51a 5.52±0.86bc
T2 18.13±1.23a 0.255±0.031a 288±16.01a 2.82±0.45ab 6.49±0.71ab
T3 16.82±0.30ab 0.207±0.021b 286±21.07a 2.22±0.21b 7.61±0.77a
  X:Ìc21€VÅ9±˜Y:,lZQl|@A¸Ì£0.05eVӝ:;¢²,¤l。
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treatmentsat0.05level;Thesameasbelow.
z2 {|}~467p9:;Table2 RootmorphologicaltraitsandvigorofwheatseedlingsunderdifferentconcentrationsofMnseedsoaking
Él
Treatment
ʔË
Totalroot
length/cm
”ÌÍÎ
Surfacearea
/cm2
”ÏÎ
Rootvolume
/cm3
”•VÅ#®
Rootaverage
diameter/mm
”o2
Roottip
/(No·plant-1)
”•›œ
Rootvigor
/(μg·g-1·h-1)
CK 414.07±24.75c 38.28±2.58c 0.28±0.02c 0.294±0.006b 616±77.68b 318.6±27.0c
T1 444.32±38.98bc 41.27±4.80bc 0.31±0.05bc 0.295±0.013b 629±65.31b 378.4±12.9b
T2 562.15±31.59a 55.82±4.07a 0.44±0.04a 0.316±0.007a 761±49.20a 422.9±5.2a
T3 481.48±25.28b 46.34±2.10b 0.36±0.01b 0.306±0.002ab 687±83.6ab 405.1±32.7ab
z3 {|}~467p9:;<„…ƒC†‡J€
Table3 DryweightsandrootshootratiosunderdifferentconcentrationsofMnseedsoakinginwheatseedlings
ÉlTreatment
Öo Dryweight/(g/plant)
ÒÓhShoot ”• Root ÔÕ Wholeplant
”×Ø
Rootshootratio
CK 0.051b 0.04b 0.091c 0.789b
T1 0.053b 0.052ab 0.104b 0.985ab
T2 0.059a 0.066a 0.124a 1.115a
T3 0.058a 0.06a 0.118a 1.025ab
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