b'Culture, as well as the NPPGA, MN Area topredictNstatusindiversepotato OneofourmostpromisinglegacyIIPotatoResearchandPromotion genotypes and carry out further screen- clonesisMN13142,anattractivelongCouncil,CavendishFarms,Simplot, ing in the future. We are not only grow- storing russet with thick skin. It standsPotatoes USA, NIFA, the North Dakota ingourownFY4,butwehave out in that it remains dormant for overSCBG program and others for research exchangedselectionsinall4market 9 months at 50 degrees without CIPC.fundinginsupportofthiswork,the classeswithWisconsin,NorthDakota, However, in the National Fry Processingpotatoimprovementteam,andthe andMichiganformulti-environment TrialandadditionallocaltrialsithasNorthDakotaStateSeedDepartment evaluation.Additionally, one of our FY4 yieldedlessthanchecks.OnewayweandMinnesotaDepartmentof clones is currently in the National Chip might improve its yield is through opti-Agricultureforcooperationandassis- Processing Trial, and three more will be mizing within row spacing. This is ourtancewithourefforts.Thepotato submitted next year pending seed avail- second year of assessing the clone at 3breeding program is supported by Dick ability.spacing levels and this project is a col-(Richard)Nilles(researchtechnician), laborationwithDr.SanjayGuptaandElizabeth Krause, Jeff Schulte, and grad- AllmaterialinbothFY4andFY3has Dr. Carl Rosen. uatestudentsEdoardoPoletti,Hashim been genotyped.Michael Miller, a mas-Andidi, and Tannis Anderson. ters degree student in the lab will use WorkingwithMN13142hasledustothe genotype data in combination with wonder about extended dormancy andSandPlainsResearchFarm, data from harvest this year and the last weatheritisaffectedbyharvestprac-Becker Minnesota two years to build genomic prediction tices. We are assessing three russet geno-Dr. Laura Shannon, UMN Potato Breedermodels,aspartofaUSDA-NIFASCRI types at two vine kill dates (90 and 110fundedgrant(www.polyploids.orgfor daysafterharvest)andtwointervalsThis is the Shannon Labs 4th field sea- moreinformation).Thismodelwill between vine kill and harvest (14 daysson, and therefore our first season with a allow us to predict which individuals are and 21 days). We plan to assess the effectfield year (FY) 4.FY4 is our first replicat- the most promising parents for the next on dormancy and collaborate with Dr.ed yield trial. We are growing 11 russets, generationandspeedthebreeding MunevverDogramacitoidentifyhow46 chips, 15 reds, and 12 yellows select- process.FY3consistsof68russets,62 thebiochemicalchangesthatoccured from FY3 for yield, specific gravity, chips, 28 reds, and 24 yellows. It is being withintubersduringdormancyareskin finish, and disease resistance in four grown as a single replicate at full N as impacted by management practices. 15 hill plots, two at full N (240 lbs/ac for describedaboveandwillbeharvestedrussets, 200 lbs/ac for chips, 170 lbs/ac and assessed with FY4.When screening the germplasm for lowforfreshmarket)andtwoat25%N. nitrogenrequirementsasdescribedThesewillbeevaluatedforyieldand Whilewehavebeengeneratingnew above,weareusingasinglepre-plantqualitytraitsatharvest,andwewill materialinthebreedingprogramwe application of N. However, as Dr. Rosenselect clones to move forward in the pro- have also been working to evaluate the has shown, the timing of N applicationgram for eventual release. Additionally, material left to us by Dr. Christian Thill, matters. Since different varieties respondthese clones are being screened for low the previous breeder. After four years of toNdifferently,wesuspectthatidealnitrogenrequirements,inpreparation anti-viral tissue culture and seed genera- timingforNapplicationmayalsobefor an MDA funded study in collabora- tion lead by our tissue culture specialist, variety dependent.Therefore, we are tri-tion with Dr. Carl Rosen that will begin KatelynFilbrandt,wehaveproduced aling 8 red cultivars with three differentin February. Dr. Xiaoxi Meng, a post doc virus free seed from our legacy material N application patternsall at pre plant,in the lab, will repeat this screening at for evaluation at Becker. This year we are half at pre plant half at emergence, andmultiple N levels over the next two years evaluating 7 russets, 2 chips, and 21 reds one third at pre plant one third at emer-andusethedatatoidentifyvarieties in 15 hill plots. This project has been genceandonethirdatflowering.WewithlowerNrequirementsandthen funded by Area II and NPPGA. will measure the effect on yield and skinbuild a model for using drone imagery finish. This project is led by Dr. Thomas20 POTATO GROWER JULY/AUGUST 2021'