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Response of Root Growth to Nutrient Level in Alfalfa Seedling Stage

营养水平对紫花苜蓿苗期根系生长的影响



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 Vol.23  No.5
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犚犲狊狆狅狀狊犲狅犳犚狅狅狋犌狉狅狑狋犺狋狅犖狌狋狉犻犲狀狋犔犲狏犲犾犻狀犃犾犳犪犾犳犪犛犲犲犱犾犻狀犵犛狋犪犵犲
XUEZheng,ZHANGKun,TANGHaiyang,SHENYixin
(ColegeofAnimalScienceandTechnology,NanjingAgriculturalUniversity,Nanjing,JiansuProvince210095,China)
犃犫狊狋狉犪犮狋:Forclarifyingtheeffectsoffertilizerontherootgrowthofalfalfa(犕犲犱犻犮犪犵狅狊犪狋犻狏犪)seedlingin
southernChina,apottrialwascarriedouttostudyrootsystem growth with4cultivars (Icon,
WL525HQ,SupersonicandWL903)treatedbyfiveconcentrationsofnutrientsolution(0.1,0.2,0.3,
0.4and0.5timesHoaglandsolution).Theresultsindicatedthattheaveragerootlength,rootnumber,
rootvolumeandrootsurfaceareaofplanttreatedby0.1and0.2timesHoaglandsolutionweregreater
thanthosetreatedby0.4and0.5timesHoaglandsolution.Butaveragerootdiameter,rootdryweight,
plantheightandstemdryweightincreasedsignificantly(犘<0.05)withtheconcentrationofHoaglandso
lutionincreasing.Theeffectofnutrientsolutionconcentrationonrootshootratiowasnosignificantdiffer
enceamongtreatmentssuggestingthattheabilityoflateralrootgrowthinalfalfaseedlingstagewasstron
geratthelowerconcentrationofnutrientsolution,andthehighlevelofnutritionpromotedthegrowthof
abovegroundandrootdrymatteraccumulationsignificantly.
犓犲狔狑狅狉犱狊:Lateralroot;Drymatteraccumulation;Rootsystem;Nutritionlevel;Alfalfa
EFGH
:20140902;IJGH:20141217
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thorforcorrespondence,Email:yxshen@njau.edu.cn
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WL903(FD9)。
áânB¥¿öB Hoagland¹N[6](P1)。
Ò+ | ë Hoagland á â n + l ÿ k n 2.5
mL·L-1,œë®F5mL·L-1。æ5eáânÜ
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zÆG0.1[、0.2[、0.3[、0.4[=0.5
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Table1 ThenutrientformulaofHoagland
®F
Elements
<@9

z{×

Compounds(AR)
Ìë
Concentration
*ë®F
Major
elements
_KØsÙCa(NO3)2·4H2O 945mg·L-1
ØsÚ KNO3 506mg·L-1
Øs* NH4NO3 80mg·L-1
rsÛËÚ KH2PO4 136mg·L-1
ÛsÜ MgSO4·7H20 493mg·L-1
lÿkn òKÛsÐlFeSO4·7H20 5.56g·L-1
Na2FeEDTA +ÛÝ_+sÛÞEDTA·Na 7.46g·L-1
œë®F
Trace
elements
ß<Ú KI 0.83mg·L-1
à s H3BO3 6.2mg·L-1
Ûsá MnSO4·4H2O 22.3mg·L-1
ÛsâZnSO4·7H2O 8.6mg·L-1
ãsÞNa2MoO4·2H2O 0.25mg·L-1
ÛsäCuSO4·5H2O 0.025mg·L-1
å<æCoCl2·6H2O 0.025mg·L-1
1.2 fgMNYUV
1CMd›x3˜xS(¼A,¥ Win
RHIZOPro2009¼Az{AÀ(RegentInstru
mentsInc.,Canada)ç¾z{,JÕL–¼u、L
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tisticsforwindows,ver19.0)¿‘;iUVp½B
ÀÁ
。ANOVA ;iNDz{,B¥ZMÃDÓ
(Duncan)Kp½;iDo—rgz{,Do—rK
L0.05。
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¼%
p

L–¼u

¼\Â=¼P/–G0.1[á
ân ^ X — r * ¦ 0.5 [ á â n ^ X (犘<
0.05)。Ò+,0.1=0.2[áân^X’“、
0.4=0.5[áân^X’“B¼%p、¼\Â
=¼P/ÂDoW—r

K¼A1ghBƒ@gz{lmPJ

P3),
¼%p

L–¼u8¼A\†P/Âf×rð
ƒ@
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4eGYBì=+©ÜC–d^XáânÜ
¨Î숗rñ 

P4)。$ WL525HQ•0.1
80.2[áân^XDoW—rs,Ò~3eGY
–PAG0.2=0.3[áân^X—r*¦0.1[
áân^X
(犘<0.05),0.4=0.5[áân^XÝ
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Table2 EffectsofdifferentconcentrationsofHoaglandsolutionontherootmorphologyofalfalfaseedling
GY
Cultivars
áânܨ
Concentrationof
nutrientsolution
/mol·L-1
¼ÜC
Rootdryweight
/mg
L–¼ÓØ
Averageroot
diameter/mm
L–¼u
Averageroot
length/cm
¼%p
Rootnumber
¼\Â
Rootvolume
/cm3
¼P/Â
Rootsurface
area/cm2
¬3Icon
0.1 8.7c 0.57b 65.10a 68.7a 0.19a 11.59a
0.2 16.1b 0.62ab 59.41a 59.7a 0.17ab 11.31a
0.3 16.5b 0.64ab 44.03ab 55.4a 0.15abc 8.70ab
0.4 36.0a 0.72a 42.38ab 52.0a 0.14bc 8.58ab
0.5 35.5a 0.72a 30.80b 34.3b 0.12c 6.73b
WL525HQ
0.1 7.7c 0.61b 67.75a 69.0a 0.20a 14.54a
0.2 16.0b 0.63b 57.43ab 57.0ab 0.16ab 9.48b
0.3 20.9b 0.66b 46.81bc 54.9ab 0.15b 8.58b
0.4 39.6a 0.80a 36.60cd 34.3bc 0.14b 7.53bc
0.5 34.2a 0.81a 29.67d 44.3c 0.12b 6.07c
ж¶
Supersonic
0.1 7.3c 0.58c 68.72a 72.9a 0.19a 12.45a
0.2 18.5b 0.61bc 51.20b 69.2a 0.18a 10.47ab
0.3 21.3b 0.64abc 46.49b 50.9b 0.17ab 9.39bc
0.4 34.9a 0.66ab 39.43b 48.0b 0.14b 7.86c
0.5 34.8a 0.69a 40.14b 48.4b 0.13b 7.75c
WL903
0.1 8.9d 0.59b 75.12a 73.3a 0.22a 14.09a
0.2 18.5c 0.61b 55.44b 53.3b 0.15b 10.15b
0.3 27.0b 0.62b 39.49c 43.0bc 0.14b 8.96b
0.4 43.5a 0.73ab 25.14d 34.4c 0.14b 6.52c
0.5 44.4a 0.87a 21.28d 31.1c 0.14b 5.92c
  ò:XÄp½ÌwéBCWXPó•犘<0.05KL‚Do—r
Note:Differentsmallettersinthesamecolumnindicatesignificantdifferenceatthe0.05level
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Table3 Correlationcoefficientsamongroottraitsofalfalfaseedling
L–¼u
Averagerootlength
¼%p
Rootnumber
¼\Â
Rootvolume
¼P/Â
Rootsurfacearea
L–¼ÓØ
Averagerootdiameter
-0.435 -0.447 -0.243 -0.384
L–¼u
Averagerootlength
1 0.584 0.583 0.818
¼%p
Rootnumber
1 0.368 0.507
¼\Â
Rootvolume
1 0.692
  ò:ƒ@gÄ×r(犘<0.01)
Note:significantcorrelationatthe0.01level
2.3 @E.
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ÙÈÊÚBVL

wáânܨ^X“DoW—r

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Fig.1 EffectsofdifferentconcentrationsofHoaglandsolutionontherootmorphologyofalfalfaseedling
ò
:0.1S,0.2S,0.3S,0.4S=0.5SzÆPó0.1,0.2,0.3,0.4=0.5[ Hoaglandáânܨ
Note:0.1S,0.2S,0.3S,0.4Sand0.5Sindicate0.1,0.2,0.3,0.4and0.5timesofHoaglandsolution,respectively
459
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Table4 EffectsofdifferentconcentrationsofHoaglandsolutionontheplantheight,
shootdryweightandrootshootratioofalfalfaseedling
GY
Cultivars
áânܨ
Concentrationof
nutrientsolution/mol·L-1
ì
Plantheight
/cm
+©ÜC
Shootdryweight
/mg
¼ÙÈ
Rootshoot
ratio
¬3Icon
0.1 5.47c 23.2e 0.38a
0.2 8.54b 50.7d 0.32ab
0.3 9.51b 67.3c 0.24b
0.4 11.81a 110.4b 0.33ab
0.5 13.19a 125.4a 0.29ab
WL525HQ
0.1 6.14c 22.2d 0.36ab
0.2 8.39bc 56.2cd 0.29b
0.3 9.31ab 66.6bc 0.32ab
0.4 10.32ab 103.8ab 0.39a
0.5 11.79a 118.3a 0.30ab
ж¶
Supersonic
0.1 6.73d 24.1d 0.31a
0.2 9.57c 67.5c 0.28a
0.3 11.14bc 78.2c 0.27a
0.4 11.96b 111.7b 0.31a
0.5 13.97a 139.3a 0.25a
WL903
0.1 6.78c 26.8c 0.33a
0.2 9.41b 70.9b 0.27a
0.3 11.54ab 72.1b 0.37a
0.4 12.31a 128.4a 0.34a
0.5 13.28a 137.6a 0.32a
  ò:XÄp½ÌwéBCWXPó•犘<0.05KL‚Do—r
Note:Differentsmallettersinthesamecolumnindicatesignificantdifferenceatthe0.05level
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