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：Twonewlybredhybridricecombinations,superhigh-yieldingLiangyoupeijiu(Pei'ai64S×9311)andPei'ai64S/E32(Pei'ai64S×E32)wereusedtoinvestigatethephotosyntheticcharacteristicsunderhightemperatureincomparisonwithhybridriceShangyou63.Hightemperaturecausedadecreasedphotosyntheticefficiencyandaggravatedphotoinhibition.TheoptimumtemperatureforphotosyntheticelectrontransportationandphotosyntheticCO2fixationwereabout28℃and35-40℃respectively.Linearelectrontransportationismoresensitivetohightemperaturethanthephotochemicalprocess.Themechanismofhightemperatureadaptationwaspossiblyasfollows:superhigh-yieldingricehasquicklyincreasingcarotenoid,whichactedasamorefavorableantioxidantsystemtoreducetheactiveoxygenproductionandavoiddamagetothephotosynthesissystem;superhigh-yieldingricehasahigherefficiencyofxanthophyllscycletodissipateexcessheatenergy;superhigh-yieldingricehasamorestablephotosyntheticfunction,higherphotosyntheticefficiencyandmoreheatstableproteincontent.

简介：Byusing304recombinantinbredlinesderivedfromindicaricecrossZhong156/Gumei2,alinkagemapconsistingof177markerlociandcovering12ricechromosomeswasconstructedandemployedformappinggenesconferringblastresistanceinrice.GenomiclocationofgenePi25(t)conferringneckblastresistancetotheChineseisolate92-183(raceZC15)wasverifiedtobelocatedbetweenmarkersA7andRG456onchromosome6,withgeneticdistancesof1.7cMand1.5cMtoA7andRG456,respectively.LeafblastresistanceofGumei2tothePhilippineisolateCa89(lineage4)wasfoundtobecontrolledbyasinglegene.ThegenetentativelydesignatedasPi26(t)waslocatedbetweenmakersB10andR674onchromosome6,withgeneticdistancesof5.7cMand25.8cMtoB10andR674respectively.ResistantallelesatbothgenelociwerederivedfromGumei2,indicatinganexistenceofresistancegeneclusterinGumei2.

简介：Thetransgenicrice,Zhongda2,whichwasgeneticallymodifiedfromanindicaricelineZhuxianBbyricechitinasegene(RC24),hadhighresistancetoricesheathblight(Rhizoctoniasolam)inlaboratoryandatwo-yearfieldexperiment.ThepathogencouldinvadesheathofZhongda2andinducesymptomsofthedisease.NodifferencewasnotedintimeofpenetrationorincubationperiodbetweenZhongda2andnon-transgenicricecontrol,ZhuxianB,butthehyphaelysatecouldbeobservedeadierthancontrol.Itsresistanceexpressedastoinhibitthegrowthofmyceliuminhosttissue.F1sfromZhongda2(♂)crossedwithotherfivenon-transgenicricelinesshowedhigherresistancethandonornon-transgenicparents,buttheresistancewasdifferentalongwiththedifferentmaternalparents.