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Physiological Responses of Cassava (Manihot esculenta Crantz) to Drought Stress |
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| รหัสดีโอไอ | |
| Creator | 1. Walaiporn Sasiprapa 2. Vichanee Aomsupsin 3. Raweewan Chuekitisak 4. Kusuma Rodpaewpan |
| Title | Physiological Responses of Cassava (Manihot esculenta Crantz) to Drought Stress |
| Publisher | Department of Agriculture |
| Publication Year | 2562 |
| Journal Title | Thai Agricultural Research Journal |
| Journal Vol. | 37 |
| Journal No. | 1 |
| Page no. | 93-104 |
| Keyword | มันสำปะหลัง, สรีรวิทยา, การขาดน้ำ, การเปลี่ยนแปลงสภาพภูมิอากาศ, การสังเคราะห์แสง, cassava, physiology, water stress, climate change, photosynthesis |
| URL Website | http://at.doa.go.th/journal |
| Website title | Thai Agricultural Research Journal |
| ISSN | 0125-8389 |
| Abstract | Cassavaisthedroughttolerantcrop,howevertheheatanddroughtstressesinThailandduring2013-2015hadcausedthedelayofcropcalendar,replanting,shorteningofgrowingperiod,andeventualyieldvariationamongcultivars.Tounderstandtheresponses ofcassavavarietiesunderwaterstressconditionsbasicinformationisneeded.Three cassavavarieties:Rayong11,Rayong86-13andCMR43-08-89wereusedinthestudyofrelationshipbetweenenvironmentalelements(solarradiation,temperatureandrelative humidity)andphotosynthesisparametersunderwaterstressconditioninKamphaengPhetProvincein2015.Resultsshowedthat,underwaterstressconditionsallvarietieshadreachedmaximumnetphotosyntheticrate(Pn)at8.00-9.00a.m.withthevaluesof14.3-18.7?molCO2m-2 s-1.Afterwatering,allhadreachedmaximumPnatthesameperiodbutvalueswerehigherat20.8-24.8?molCO2m-2 s-1.Theperiodofphotosynthesiswaslimitedwith waterstress asconfirmedby6MAPdata,thatphotosynthesisperiodwasexpandedto10.00a.m.duringrainyseasonandallvarietiesshowedhigherPn22.5-26.1? molCO2m-2 s-1. Rayong86-13withhighstarchcontent,showedsmallestTrduringthedayandstomatalconductance(gs)highestinearlymorningandstomataclosebeforetheothers.Pnshowedpositivecorrelationwithtranspirationrate(Tr),whereasTrshowednegativerelationwith relativehumidity(RH),PhotosyntheticPhotonFluxDensity(PPFD)showedpositiverelationwithairtemperatureandTrbutnegativerelationwithRH,significantly.PhotosynthesisoccurredduringPPFD1502,300m?olm-2 s-1.Underwaterstresscondition,photosynthesis occurredduringlowPPFDandhighRH,butwouldoccurforlongerperiodinnon-waterstresscondition,althoughlowRH32-40%. |
