SRS4462971 SAMN11082863 3690 Populus x canadensis Dormant fertile P. deltoides branches were collected from mature trees in January of 2013. Branches from the male P. nigra individual were forced in greenhouse conditions and pollen collected and desiccated, and stored at 4ºC prior to being irradiated. Gamma irradiation was performed as follows: Dried pollen from male Populus nigra trees was transferred to scintillation vials and subjected to 50 or 100 Gy of gamma irradiation using a JL Shepherd Model 143-68 Irradiator (Center for Comparative Medicine, UC Davis, CA). bioproject 241273 PRJNA241273 cultivar F1 interspecific hybrid between male Populus nigra (individual SO361SL, Greenwood Resources Inc. (OR)) and Populus deltoides female tree (SO598SL, Greenwood Resources Inc. (OR)) age missing dev_stage Seedling geo_loc_name missing tissue leaf biomaterial_provider Andrew T. Groover, Institute of Forest Genetics Pacific Southwest Research Station U.S Forest Service Davis, CA 95616 U.S.A. genotype DN sample_type Whole plant treatment gamma irradiation (100 Gy) Label GWR_100_103 BioSampleModel Plant SRS4462972 SAMN11082864 3690 Populus x canadensis Dormant fertile P. deltoides branches were collected from mature trees in January of 2013. Branches from the male P. nigra individual were forced in greenhouse conditions and pollen collected and desiccated, and stored at 4ºC prior to being irradiated. Gamma irradiation was performed as follows: Dried pollen from male Populus nigra trees was transferred to scintillation vials and subjected to 50 or 100 Gy of gamma irradiation using a JL Shepherd Model 143-68 Irradiator (Center for Comparative Medicine, UC Davis, CA). bioproject 241273 PRJNA241273 cultivar F1 interspecific hybrid between male Populus nigra (individual SO361SL, Greenwood Resources Inc. (OR)) and Populus deltoides female tree (SO598SL, Greenwood Resources Inc. (OR)) age missing dev_stage Seedling geo_loc_name missing tissue leaf biomaterial_provider Andrew T. Groover, Institute of Forest Genetics Pacific Southwest Research Station U.S Forest Service Davis, CA 95616 U.S.A. genotype DN sample_type Whole plant treatment gamma irradiation (100 Gy) Label GWR_100_111 BioSampleModel Plant