番茄野生近缘种及其育种应用.pdf

1、David FrancisProfessor,The Ohio State UniversityProblem solving through trait discovery and genetic improvement of cropsWild Crop Relatives are The(TM)source of new traitsDisease resistanceDraught resistanceImproved nutritional contentPlant genetic resources are available through NPGS collections.Th

2、ey are not available from the wild or Svalbard(its a vault,not a bank)Problem solving through trait discovery and genetic improvement of cropsWild Crop Relatives are The(TM)source of new traitsDisease resistanceDraught resistanceImproved nutritional contentPlant genetic resources are available throu

3、gh NPGS collections.They are not available from the wild or Svalbard(its a vault,not a bank)Photo credits:Silvia Francis;Charles Rick,TGRCPhoto credits:David Francis;Roger Chetelat,TGRCExtreme weather represents a major challengeWater deficit tolerance from Solanum galapagense(wild tomato from the G

4、alapagos Islands)Another consequence of extreme weather is rapidly changing pathogen profile.Example:Xanthomonas species and race changes in the U.S.MidwestIdentify a source of resistance,Create populations,“Map”the resistance(how many genes?,what chromosome are they on?),Implement selection strateg

5、y(goal:resistant progeny that have the yield and quality characteristics a grower,processor,and consumer want)S.Pimpinellifollium PI 128216Example:T3 resistance from PI128216 IBC populationCandidate gene identification:Provides tools for continued improvement This story of crop improvement could be repeated for:Multiple plant diseases caused by viruses,fungi,oomycetes,bacteria,insectsNutritional qualityPlant architecture and yieldEnvironmental stress tolerance(too much water,too little water,heat,cold)Most crops