?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Vergleich+von+Hybridsorten+mit+samenfesten+Sorten+bei+Karotten&rft.subject=+Breeding%2C+genetics+and+propagation&rft.description=There+is+an+ongoing+discussion+amongst+researchers+and+farmers+involved+in+organic+horticulture+concerning+the+role+that+F1+hybrid+varieties+should+play+in+organic+farming.+Proponents+of+hybrids+state+that+their+use+is+already+much+established+in+organic+farming+and+that+it+would+be+a+step+backwards+to+dispense+with+them.+Agronomic+superiority+of+hybrids+over+open+pollinated+(OP)+varieties+is+often+claimed.+Opponents+to+hybrid+varieties+claim+that+heterosis+puts+an+emphasis+on+biomass+accumulation+and+yield+but+that+the+more+subtle+aspects+of+ripening+and+creation+of+aroma+are+neglected+in+hybrid+varieties.%0D%0A%0D%0AProject+aims+including+target+group%3A%0D%0ATo+characterize+F1+and+OP+varieties+of+carrots+in+a+2-year+field+trial.+Analytical+and+sensory+parameters+are+collected.+Target+groups+are+plant+breeders+for+organic+farming%2C+advisors+and+people+interested+in+food+quality.%0D%0A%0D%0AMethodology%3A%0D%0AField+trial%3A+1+site%2C+two+years.+First+year+(2002)%3A+3+F1+varieties%2C+3+OP+varieties%2C+4+inbred+parent+lines+of+hybrids+(2+male+sterile%2C+2+fertile).+Second+year%3A+3+F1+varieties%2C+3+OP+varieties.+4+replications+each+year.+%0D%0AParameters%3A+yield%2C+single+carrot+weight%2C+proportion+of+marketable+carrots%2C+leaf+yield%2C+Alternaria%2C+foul+carrots+at+harvest%2C+Brix%2C+Malat%2C+Dry+matter%2C+ash%2C+%C3%8E%C2%B1-carotene%2C+%C3%8E%C2%B2-carotene%2C+Isocumarin%2C+Saccharose%2C+Glucose%2C+Fructose%2C+Total+sugar+content%2C+Relation+of+mono-+and+disaccharids%2C+Protein%2C+P%2C+K%2C+Ca%2C+Mg%2C+and+5+parameters+from+the+tasting%3A+Texture%2C+Aroma%2C+Sweetness%2C+Bitterness+and+Overall+impression.%0D%0AResults%2C+conclusion%2C+state+of+the+art%3A%0D%0AIn+2002%2C+29+Parameters+were+collected.+F1+hybrids+performed+significantly+better+in+5+of+these+parameters+(Alternaria+occurence%2C+dry+matter+content%2C+dry+matter+yield%2C+Saccharose+content+and+the+relation+of+Mono-+to+disaccharids).+Most+noticeable+was+the+clearly+higher+dry+matter+yield+of+F1+varieties.+OP+varieties+only+performed+better+in+1+of+the+parameters+(less+bitter+in+the+tasting).%0D%0AThere+was+a+tendency+for+the+F1+hybrids+to+perform+better+in+agronomic+and+analytical+parameters+and+for+OP+varieties+to+perform+better+in+the+tasting.+%0D%0AIn+2003%2C+24+parameters+were+collected+up+to+now+(Threre+was+no+noteworthy+alternaria+occurence+in+the+field+and+no+foul+carrots+at+harvest.+Carotene+und+Isocumarin+contents+are+still+owing).+F1+hybrids+performed+significantly+better+in+4+of+these+parameters+(proportion+of+marketable+carrots%2C+sweetness%2C+less+bitterness+and+overall+impression+in+the+tasting).+OP+varieties+only+had+a+significantly+higher+ash+content.+%0D%0AThere+was+a+tendency+for+higher+contents+of+minerals+in+OP+varieties%2C+whereas+F1+hybrids+tended+to+have+higher+yield+and+sugar+parameters.%0D%0ANone+of+the+collected+parameters+showed+a+significant%2C+constant+difference+between+the+variety+groups+over+both+years.+%0D%0AHowever%2C+F1+hybrids+tended+to+have+higher+sugar+contents+in+both+years+which+was+especially+due+to+use+of+the+variety+%C3%A2%C2%80%C2%9CBolero%C3%A2%C2%80%C2%9D.+%0D%0AThis+strong+emphasis+on+sweetness+was+evaluated+positively+in+the+tasting%3A+Bolero+obtained+the+best+overall+impression+score+in+both+years.+%0D%0A&rft.type=Project+description&rft.type=NonPeerReviewed&rft.identifier=%7BProject%7D+Vergleich+von+Hybridsorten+mit+samenfesten+Sorten+bei+Karotten.+[Hybrid+and+open+pollinating+variety+of+carrots+%C3%A2%C2%80%C2%93+a+comparison.]+Runs+2002+-+2004.+Project+Leader(s)%3A+Arncken%2C+Christine%2C+Research+Institute+of+Organic+Agriculture+(FiBL)%2C+CH-5070+Frick.+More+information+online+at+%3Chttp%3A%2F%2Fwww.fibl.org%2Fde%2Fschweiz%2Fforschung%2Fbodenwissenschaften%2Fbiosaatgut.html+%3Chttp%3A%2F%2Fwww.fibl.org%2Fde%2Fschweiz%2Fforschung%2Fbodenwissenschaften%2Fbiosaatgut.html%3E%3E.&rft.relation=http%3A%2F%2Forgprints.org%2F6380%2F