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Effect of 5 Aminolevulinic Acid on Low Light Tolerance of Apple Leaves

5 氨基乙酰丙酸对苹果叶片耐弱光能力的影响



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,2016,36(5):0987-0995
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ANYuyan1,ZHANGLiying1,FENGXinxin1,TIANFan2,LIJie2,WANGLiangju1
(1ColegeofHorticulture,NanjingAgriculturalUniversity,Nanjing210095,China;2FengxianLinfengFruitandVegetable
ProfessionalCooperativesofJiangsuProvince,Xuzhou,Jiangsu221723,China)
犃犫狊狋狉犪犮狋:Inordertoprovidetheoreticalbasisforimprovementofappleproductionunderrainshelterculti
vation,weevaluatedtheeffectof5aminolevulinicacid(ALA)onlowlighttoleranceofappletreesinthis
study.Specificaly,theeffectsof10mg·L-1 ALAonreactiveoxygenmetabolismandfastchlorophyl
fluorescencecharacteristicsofappletreesunderlowlightconditionswereinvestigatedbyrootALAappli
cation.Twoapplecultivars,‘Runtai2’and‘Zhengyou3’,wereused,andthreelightconditionsinclu
dingnormalnaturalcondition(Control),lightshadingstress(LS),andsevereshadingstress(SS),were
designedinourexperiment.Themainresultswereasfolows:(1)Comparedtothecontrol,shading
stresssignificantlydecreasedsuperoxidedismutase(SOD)andperoxidase(POD)activities,andincreased
theproductionratesofsuperanion(O
-·
2 )andhydrogendioxide(H2O2)andmalondialdehyde(MDA)con
tentinbothapplecultivars.MoreincreasesinMDAcontentandtheproductionratesofO
-·
2andH2O2were
foundin‘Zhengyou3’.ALAsignificantlyimprovedantioxidantenzymeactivities,andreducedthepro
ductionratesofO
-·
2andH2O2andMDAcontent.Theantioxidantcapacityof‘Zhengyou3’wasimproved
moresignificantlybyALAthanthatin‘Runtai2’.(2)Chlorophylcontentsandchlorophylb/aratioin
appletreesincreasedundershadingstress.ALAfurtherpromotedchlorophylcontentsandchlorophylb/
aratioinappletreesundershadingstress.(3)Chlorophylfluorescenceparameter犞J,犕o,andDIo/RC
significantlyincreased,andψo,ψEo,ψRo,PIABS,PICS,and犘犐totaldramaticalydecreasedundershading
stress.ALAinhibitedchangesofthesechlorophylfluorescenceparametersundershadingstress,even
madethemrecovertothecontrollevels.Theseresultssuggestedthatoxidativedamageoccurredinapple
treesunderlowlightconditionsduetotheirlowantioxidantcapacities,andantioxidantcapacityin
‘Zhengyou3’waslowerthanthatin‘Runtai2’.ALAenhancedantioxidantcapacityofappletrees,de
creasedlowlightinducedoxidativedamage,andimprovedabilityoftrappingandutilizationoflightener
gy,photosyntheticelectrontransferability,lightuseefficiency,andphotosyntheticperformanceinapple
treesundershadingstress.Takentogether,ourresultsdemonstratedthatALAimproveslowlighttoler
anceofappletrees.
犓犲狔狑狅狉犱狊:5aminolevulinicacid(ALA);shadingstress;reactiveoxygenmetabolism;chlorophylfluores
cencecharacteristics;apple(犕犪犾狌狊犱狅犿犲狊狋犻犮犪Borkh)
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shadingstress(20%naturalcondition),respectively;Theerrorbarsmeansstandarddeviation(SD)offour
biologicalreplicates;Thesameasbelow
Fig.1 Effectsofshadingfacilitiesonenvironmentalfactorsinappleorchards
o1 fgp犃犔犃VWqr:;st<=ijkl_mnCu_
Table1 ChangesofmembranelipidperoxidationinappleleavesoftwocultivarsundershadingstressandALAtreatment
«P
Treatment

-·
2 ÈOÉÊO
-·
2 productionrate
/(nmol·min-1·g-1)
Ž2
Runtai2
‘’3
Zhengyou3
H2O2ÎÏ H2O2content
/(μmol·g-1)
Ž2
Runtai2
‘’3
Zhengyou3
MDAÎÏ MDAcontent
/(μmol·g-1)
Ž2
Runtai2
‘’3
Zhengyou3
)*ˆCK 20.32±0.34d 15.73±0.96f 24.27±0.42d 16.15±0.41f 19.26±0.67d 19.40±0.32d
žŸ ¡LS 24.00±0.41c 28.60±0.74b 26.34±0.84c 28.31±0.48b 22.62±0.68c 25.53±0.47b
¢Ÿ ¡SS 27.02±0.76b 35.04±1.07a 28.13±0.85b 30.21±0.41a 25.17±0.80b 30.61±0.63a
)*ˆ+ALACK+ALA 12.57±0.78g 8.50±0.56h 16.22±0.91f 8.96±0.35h 14.04±0.60f 11.59±0.87g
žŸ ¡+ALALS+ALA 14.27±0.73fg 14.15±0.84fg 17.24±0.54ef 14.41±0.32g 16.96±0.84de 15.24±1.39ef
¢Ÿ ¡+ALASS+ALA 16.66±0.74ef 18.70±1.21de 18.23±0.72e 17.22±0.61ef 18.43±0.55d 19.23±0.70d
  J:óß[\¬=óŸ{|}빫P,+•–,Ñ0.05éêÔÚ_¸¾;¬ó。
  Note:Thedifferentlettersbehindthesameparameterindicatesignificantdifferencesbetweentreatmentsorcultivarsat0.05level.The
sameasbelow.
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SOD¯‰SODactivity
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Fig.2 ChangesofchlorophylcontentsinappleleavesoftwocultivarsundershadingstressandALAtreatment
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f3  ¡¼½ALA«P¬“…f•–­®­³´ôµˆ¶‰ŠÛÂ
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shadingstressandALAtreatment
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shadingstressandALAtreatment
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[2] 7ßQ.¨àá•-.fgØÞ[M]."l:.m4³Þ
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499 ! " # $ % &                   36Ó
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