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,2016,36(7):1399-1407
犃犮狋犪犅狅狋.犅狅狉犲犪犾.犗犮犮犻犱犲狀狋.犛犻狀.
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犘犺狔狊犻狅犾狅犵犻犮犪犾犆犺犪狉犪犮狋犲狉犻狊狋犻犮狊犪狀犱犌狉狅狑狋犺
狅犳犔狅狇狌犪狋狌狀犱犲狉犇狉狅狌犵犺狋犛狋狉犲狊狊
WANGDan,GONGRonggao,RONGYi
(ColegeofHorticulture,SichuanAgricultureUniversity,Chengdu611130China)
犃犫狊狋狉犪犮狋:Inordertoexploretheeffectsonphysiologicalcharacteristicsandgrowthofloquatunderdrought
stress,weconductedapotexperimentof4treatmentswhichwereCK,lightstress(LS),moderatestress
(MS)andseverestress(SS)byusing3yearold‘Dawuxingloquat.Theresultsshowedthat:(1)Plant
height,stemleafbiomassandrootbiomasswereinhibitedunderdroughtstress.(2)Thechlorophylcon
tentsincreasedunderlightandmoderatedroughtstress,theleafrelativewatercontent(LRWC)andchlo
rophylcontentsdecreasedsignificantlyfolowingthelackoftherelativewatercontentofsoil.(3)Net
photosyntheticrate(犘n),transpirationrate(犜r)andstomatalconductance(犌s)showeddecreasingtrends
significantlyand犌swasthemostsensitiveonetodroughtstress.However,intercelularCO2concentration
(犆i)increasedandthendeclinedwithincreasingdroughtstress.Wateruseefficiency(犠犝犈)gotthemini
mumunderseverestress.(4)Withwaterstressintensifying,superoxidedismutase(SOD)activityand
peroxidase(POD)activitydecreasedafteraninitialincrease.Catalase(CAT)playedapivotalroleatlight
stress,whilereducedatseverestress.Malondialdehyde(MDA)contentenhancedsignificantlyundermod
eratestressfor10days.(5)Freeproline(Pro)contentincreasedwhendroughtstresswasfortifiedand
wasthehighestafterseverestressfor10days.However,solubleprotein(SP)contenthadnosignificant
differenceunderthelateofdroughtstress.Thesolublesugarcontentpeakedinthelaterofseverestress
andhadsignificantdifferencewiththecontrast.Theresultsprovedthatloquatleavesenhancedtheirtoler
anceandadaptabilitybycontrolingtheactivitiesofantioxidantenzymesandosmoticadjustmentandpro
tectiveenzymesystemunderlightormoderatestress,thoughthewaterdeficitrestraineditsphotosynthe
sis.Themembranesystemandphotosyntheticsystemofloquatweredamagedandenzymeactivitiesaffect
edsothatthegrowthofloquatwerebadlyinhibitedwiththeincreaseofdroughtstress.
犓犲狔狑狅狉犱狊:loquat;droughtstress;growth;photosyntheticproperties;antioxidantenzymeactivity;os
moticregulation
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Table1 Effectsofdroughtstressongrowthparametersofloquatleaves
3
Determinationindex
mC
Treatment
mCº² Treatmenttime/d
0 5 10 15 20
K
Plantheight/cm
CK 67.7±0.72a 69.4±1.08a 71.8±0.95a 73.1±1.05a 74.3±1.03a
LS 66.3±0.52a 68.5±0.72a 69.9±0.78a 70.5±1.23a 69.6±1.27b
MS 63.6±0.36b 62.8±0.35b 61.4±1.07b 60.2±1.08b 59.4±0.43c
SS 62.1+0.55b 60.8±0.96b 59.3±0.82b 58.0±1.09b 57.2±1.82c
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Stemleafbiomass/g
CK 19.55±0.72a 20.21±0.71a 20.35±1.43a 21.19±1.18a 21.57±0.86a
LS 19.66±0.76a 21.11±1.03a 21.01±0.58a 19.79±0.48a 17.27±1.0b
MS 17.74±1.34ab 16.39±0.97b 15.27±0.85b 13.90±0.74b 12.43±1.16c
SS 15.94±0.82b 13.21±0.77c 11.26±0.22c 10.29±0.21c 10.01±0.92c
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Rootbiomass/g
CK 5.31±0.28a 5.42±0.24a 5.54±0.17a 5.65±0.10a 5.67±0.11a
LS 5.39±0.05a 5.43±0.14a 5.44±0.17a 5.51±0.12a 5.51±0.19a
MS 5.21±0.22a 5.10±0.03a 4.84±0.22b 4.59±0.21b 4.29±0.11b
SS 4.49±0.22b 4.17±0.30b 3.81±0.13c 3.58±0.12c 3.34±0.05c
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Rootshootratio
CK 0.27+0.017a 0.27+0.009a 0.27+0.024ab 0.27+0.02c 0.26+0.017a
LS 0.27+0.012a 0.26+0.007a 0.26+0.0b 0.28+0.012bc 0.32+0.029a
MS 0.29+0.032a 0.31+0.023a 0.32+0.032ab 0.33+0.017ab 0.35+0.035a
SS 0.28+0.01a 0.32+0.031a 0.34+0.015a 0.35+0.017a 0.33+0.038a
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Table2 Effectsofdroughtstressonrelativewatercontentandchlorophylcontentofloquatleaves
3
Determinationindex
mC
Treatment
mCº² Treatmenttime/d
0 5 10 15 20
ph
LRWC/%
CK 85.2±0.88a 86.0±0.30a 85.1±0.32a 85.4±0.23a 85.7±0.23a
LS 84.0±0.18ba 83.7±0.12b 82.5±0.52b 81.3±0.85b 79.1±0.50b
MS 82.5±0.68b 79.0±0.26c 76.9±0.09c 68.3±0.28c 64.9±0.55c
SS 78.0±0.28c 73.2±0.18d 63.0±0.33d 55.0±0.12d 49.0±0.23d
Chlorophylcontent
/(mg·g-1)
CK 2.97±0.136ab 3.09±0.049a 3.16±0.121a 3.28±0.040a 3.15±0.130a
LS 3.16±0.021a 3.34±0.170a 3.23±0.095a 3.00±0.111b 3.22±0.064a
MS 2.74±0.067bc 3.07±0.171a 3.04±0.114a 2.79±0.027b 3.20±0.151a
SS 2.56±0.044c 2.52±0.068b 2.23±0.098b 1.98±0.070c 1.92±0.081b
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Table3 Effectsofdroughtstressonthegasexchangeparametersofloquatleaves
3
Determinationindex
mC
Treatment
mCº² Treatmenttime/d
0 5 10 15 20
¢£¤¥¦犘n
/(μmol·m-2·s-1)
CK 3.36±0.05a 3.32±0.08a 3.30±0.12a 3.40±0.05a 3.38±0.05a
LS 3.18±0.08a 3.11±0.06b 3.17±0.07a 2.89±0.12b 2.76±0.08b
MS 2.77±0.04b 2.66±0.04c 2.29±0.07b 1.88±0.07c 1.43±0.07c
SS 0.91±0.08c 0.65±0.06d 0.45±0.02c 0.39±0.02d 0.35±0.07d
§¨¥¦犜r
/(mmol·m-2·s-1)
CK 0.55±0.02a 0.56±0.02a 0.58±0.01a 0.55±0.02a 0.56±0.02a
LS 0.49±0.02a 0.47±0.01b 0.48±0.02b 0.43±0.02b 0.32±0.01b
MS 0.35±0.04b 0.31±0.02c 0.28±0.01c 0.23±0.02c 0.16±0.01c
SS 0.15±0.01c 0.14±0.02d 0.12±0.05d 0.11±0.01d 0.13±0.01c
©ª«o犌s
/(mol·m-2·s-1)
CK 0.129±0.003a 0.125±0.001a 0.126±0.002a 0.130±0.009a 0.127±0.002a
LS 0.086±0.001b 0.075±0.001b 0.071±0.001b 0.064±0.001b 0.033±0.001b
MS 0.043±0.001c 0.030±0.005c 0.024±0.002c 0.020±0.002c 0.013±0.001c
SS 0.017±0.001d 0.014±0.001d 0.010±0.002d 0.007±0.001c 0.006±0.001d
±²CO2³o犆i
/(μmol·mol-1)
CK 278.11±1.90c 280.60±3.22c 282.54±1.73c 279.42±1.64c 279.97±2.05d
LS 254.44±0.78d 250.83±2.28d 237.65±1.27d 253.98±1.98d 287.23±1.27c
MS 295.99±1.91b 326.76±1.28b 348.57±1.73b 351.65±3.93b 369.98±2.18b
SS 377.21±3.62a 388.00±1.32a 421.34±3.16a 420.75±0.95a 406.32±0.53a
hl»¼¦犠犝犈
/(mmol·mol-1)
CK 6.11±0.13b 5.93±0.19bc 5.69±0.14b 6.18±0.33b 6.04±0.19b
LS 6.49±0.23ab 6.62±0.10b 6.60±0.39b 6.72±0.06b 8.63±0.53a
MS 7.91±0.79a 8.58±0.69a 8.18±0.11a 8.17±0.39a 8.94±0.49a
SS 6.07±0.60b 4.64±0.66c 3.75±0.45c 3.55±0.16c 2.69±0.35c
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