简介：Race-specificresistanceandfieldresistanceof30riceblastresistancemonogeniclinesderivedfromdifferentresourceswereevaluated.Thespectraofresistanceto163MagnaporthegriseaisolatescollectedfromindicariceinGuangdongProvince,Chinarangedfrom0.6%to89.6%.Mostofthemonogeniclinesshowedanarrowresistancespectrumandhighsusceptibilityinriceblastarea,whereasthelineswithPikhandPi1(t)hadthebroadresistancespectraof89.6%and82.2%respectively,showingahighandstableblastresistanceinfields.Accordingtotheclusteranalysisofspecificresistanceto163blastisolatestested,the30monogeniclinesweredividedinto15groups,andbasedontheprincipalfactoranalysis,ninekindsofrace-specificresistancewereidentified.Pik,Piz5,Pi9andPishcanbeusedascandidateresistancegenesforricebreedingsincetheirspecificresistancedifferedfromthoseofthebackboneparentsinGuangdong,China.GenepyramidingofPikh[orPi1(t)],Pi9(orPiz5)andPish(orPita2)willbeeffectivetoobtainbroad-spectrumblastresistanceinricebreedingprograminGuangdong,China.Thestrategiesforstudyingandapplicationofriceblastresistancegeneswerediscussed.