简介：ThetransgenicriceKMD1,expressingasyntheticCry1AbgenefromBacillusthuringiensis,showedeffectiveresistancetoSignificantdeclineswererevealedinfoodconsumptionandgrowthoftheolderRLFnymphsfedonthecut-leavesoftransgenicKMD1plants.TheincreaserateoffoodconsumptionbylarvaefedonKMD1wasdrasticallylowerthanthoseonXiushui11.FoodconsumptionwasvariedwithdifferentinstarswhenthelarvaefedontheBtrice.Thoseoffourth-andfifth-instarlarvaeweredifferentcomparedtothethird-instar,lowerthanthoseonthenon-transgenicricebutstillincreasedalittlewhenthefeedingtimeprolonged.ItisindicatedthatyoungerRLFlarvaearemoresensitivetoBtricethanolderones.Also,about81%,78%and68%ofthethird-,fourth-andfifth-instarRLFlarvaediedwithin72hoursbioassayperiodonKMD1leaves,respectively.TheseresultsdemonstratedthatBt-transgeneinKMD1riceconferssubstantialprotectionagainstinfestationswitholderRLFlarvae.

简介：Riceisthestaplefoodofmorethanhalfoftheworld'spopulation.Theproduction,processingandmanagementofpaddyricehaveprovidedthebasicconditionsforthelivingofmankind.Theproductionofricehasnotonlycreatedemploymentopportunitiesforonebillionagriculturalpopulationindevelopingnations,buthasalsocontributedtothedevelopmentofthesplendidcultureassociatedwithriceproduction.Hence,effectiveandproductivericesystemsplayaninfluentialroleindevelopmentofeconomyandimprovementofqualityoflife.Inviewofthis,on16December,2002,theUNGeneralAssemblydeclaredtheyearof2004theInternationalYearofRice.