简介：Informationonricephenologyisessentialforyieldestimationandcropmanagement.Totesttheabilityofremotesensingindetectingmultiplephenologicalstages,paddyricecanopyspectrumwasmeasuredbyahand-heldradiometer.Normalizeddifferencevegetationindex(NDVI)wascalculatedfromspectrum,andtheslopeofNDVIwasobtainedasitsdifference.WeevaluatedtheresponseofNDVIanditsslopetoricegrowthwithacomparisonoftwolate-seasonricecultivars.TheresultsshowedthatNDVIanditsslopecurveshaddistinctvariationcorrespondingtoricedevelopmentandtheycouldbeusedascultivar-independentphenologicalindicators.Thedatesoffloodingandtransplanting,tillering,panicledevelopment,headingandflowering,maturity,harveststages,andevenfieldmanagementpractices,couldbededucedfromtheseindicators.‘NDVI≤0'couldbeusedasasinglethresholdforthedetectionoffloodingandtransplanting.ThelargestspikeinthecurveoftheNDVIslopeindicatedthedurationoftilleringstage.Thenextspikecorrespondedtopanicledevelopment.TheheadingandfloweringstagewascharacterizedbythemaximumNDVIandthechangeofNDVIslopefrompositivetonegative.Atthematuritystage,NDVIdecreasedcontinuously,anditsslopefluctuatedjustbelowzero.Whenricegrainswerecompletelymatureandreadyforharvest,NDVIdeclinewasaccelerated.Atharvest,NDVIslopereacheditsminimumvalue.Thedistinctionbetweenheadingandmaturitystageswasobscure,mostlikelyduetoNDVIsaturationathighbiomass.Thestudymightprovidereferencesforpaddyricephenologydeterminationthroughremotesensingimages.

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简介：Aspontaneousmutation,tentativelynamedd63,wasderivedfromthetwin-seedlingprogeniesofricecrossedbydiploidSARIIIandMinghui63.Comparedwithwild-typeplants,thed63mutantshowedmultipleabnormalphenotypes,suchasdwarfism,moretillers,smallerflagleafandreducedseed-settingrateand1000-grainweight.Inthisstudy,twoF2populationsweredevelopedbycrossingbetweend63andNipponbare,d63and93-11.Geneticanalysisindicatedthatd63wascontrolledbyasinglerecessivegene,whichwaslocatedontheshortarmofchromosome8,withinthegeneticdistanceof0.40cMfromRM22195.Hence,D63mightbeanewgeneastherearenodwarfgenesreportedontheshortarmofchromosome8.