摘要
Phytochromeshavebeenreportedtoplayimportantrolesinseedlingde-etiolationandfloweringinrice.Toidentifytherolesofphytochromesinregulatingrootgrowthandaccumulationofdrysubstances,thelengthsofseminalrootsandthedryweightsofseedlingsweremeasuredinthewildtypeaswellasthephytochromeA（phyA）andphytochromeB（phyB）mutantsgrownunderdifferentconditions.Whenthewholeseedlingswereexposedtowhitelight,theelongationoftheseminalrootswassignificantlyphotoinhibitedinthewildtype,whereasthisinhibitoryeffectwasclearlyreducedinthephyAandphyBmutants.Whentherootsoftheseedlingswereblockedfromwhitelight,thephyAandphyBmutantsexhibitedsignificantlylongerseminalrootsthanthewildtype.Theseresultssuggestthatboththeroot-localizedandshoot-localizedPHYAandPHYBareinvolvedinthephotoinhibitionofseminalrootelongationinriceseedlings.Bymeasuringthedryweightsofrootsandshoots,itisrevealedthatPHYBpositivelyregulatestheaccumulationofdrysubstancesinshoots,however,PHYAexertsthecontraryeffectsontheaccumulationofdrysubstancesinrootsandshootsofriceseedlings.
出版日期
2013年02月12日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
