简介:Thelengthsofmesocotylintheseedlingsof84lowlandricevarietiesand12uplandricevarietiesweremeasuredfollowingthetreatmentsofdaylightanddarknessduringgermination.Theelongationofmesocotylinthevarietiestestedwasinhibitedunderdaylightcondition,andthemesocotylofallthevarietieselongatedvariablyunderdarknesscondition.Theelongatedlengthsofthemesocotylinuplandrice,rangingfrom0.36cmto1.61cmwithanaverageof0.81cm,wasobviouslylongerthanthoseinlowlandrice,rangingfrom0.12cmto1.56cmwithanaverageof0.42cm.Among14ricevarietieswithover1cmofmesocotyllength,fivebelongedtouplandrice,andninetolowlandrice.Thepossibleutilizationoftheelongated-mesocotylricegermplasminvarietalimprovement,direct-seededplantingandseedpuritytestingwerediscussed.