Growth and Physiological Performance of Aerobic and Lowland Rice as Affected by Water Stress at Selected Growth Stages-中国期刊网

摘要 AerobicricetechnologyisstillnewinMalaysia,andinformationregardingMARDIAerob1(MA1),thefirstlocalaerobicricevariety,isstilllacking.Therefore,comparativestudieswerecarriedouttodeterminethephysiologicalperformanceofaerobicricevarietyMA1andlowlandricevarietyMR253underwaterstressgivenatthepanicleinitiation,floweringandripeningstages.Thisexperimentwasarrangedinarandomizedcompleteblockdesign.Stomatalconductance(gs),chlorophyllafluorescence(Fv/Fm),leafrelativewatercontent(leafRWC),andsoilmoisturecontent(SMC)aswellasyieldcomponentparameterssuchaspaniclenumber,grainyieldand100-grainweightweremeasured.ResultsrevealedthatgsandleafRWCforbothvarietiesdecreasedwithdepletionofSMC.ThecorrelationstudybetweenthephysiologicalparametersandSMCindicatedthatFv/Fmwasnotaffectedbywaterstress,regardlessofvarieties.Theyieldcomponents(paniclenumber,grainyieldand100-grainweight)forbothvarietiesgreatlydecreasedwhenwaterstresswasimposedatthepanicleinitiationstage.Thisstudyshowedthatthepanicleinitiationperiodwasthemostsensitivestagetowaterstressthatcontributedtoasubstantialreductioninyieldforbothvarieties.Undertheaerobiccondition(control),MR253producedhigherpaniclenumber,100-grainweightandyieldthanMA1.AlthoughMR253isbredforlowland,itiswelladaptedtoaerobiccondition.

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Growth and Physiological Performance of Aerobic and Lowland Rice as Affected by Water Stress at Selected Growth Stages

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Growth and Physiological Performance of Aerobic and Lowland Rice as Affected by Water Stress at Selected Growth Stages

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