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ACCESSIONPLANT NAMETAXONOMYORIGINGENEBANKIMAGEAVAILABILITYRECEIVEDSOURCE TYPESOURCE DATECOLLECTION SITECOORDINATESELEVATIONHABITATIMPROVEMENT LEVELNARRATIVE
0PI 698635'TropicS-G2-NC'Zea mays L. subsp. mays Delaware, United StatesNC7KERNELSNot Available2021DEVELOPEDBreeding materialThe parallel selected tropical synthetic (TropicS) of maize is a collection of location-specific lineages derived from a common base population (TropicS-G0) which were systematically selected for early flowering time at eight locations spanning 28 degrees latitude in the USA. Seven tropical inbred lines were used as parents (CML10, CML258, CML277, CML341, CML373, Tzi8, Tzi9) to create TropicS-G0. These lines have high yield potential in topcrosses with U.S-adapted hybrids. However, due to their late flowering time in temperate environments, with long day-lengths during the growing season, the parental lines per se are poorly adapted to most of North America.After recombining the parental lines to create TropicS-G0, multiple generations of artificial truncation selection for early flowering time were performed at eight locations: Madison, WI; Boone, IA; Newark, DE; Clayton, NC; Lubbcok, TX; Caldwell, TX; Homestead, FL; and Santa Isabel, PR. To minimize genetic drift during selection, in each generation a large population was evaluated (10,000 plants) and a large number of individuals were selected and intercrossed (500 of the earliest flowering plants). The parallel selected TropicS collection was developed as a public resource for breeders and those seeking to investigate crop adaptation. This was developed as part of the Agriculture and Food Research Initiative Grant No. 2011-67003-30342 from the USDA-NIFA (Agriculture and Natural Resources Science for Climate Variability and Change Program).2116183PI 698635
1PI 690623'CML 373'Zea mays L. subsp. mays Ciudad de México, MexicoNC7KERNELS2014DEVELOPEDPRE 04/18/2014Breeding materialSubtropical adaptation, Interm maturity, A TESTER heterotic group1918533PI 690623
2PI 690575'CML 10'Zea mays L. subsp. mays Ciudad de México, MexicoNC7KERNELS2003DEVELOPEDPRE 04/21/2003Breeding materialLowland adaptation, Late maturity, Rust resistance1645464PI 690575
3PI 690597'CML 258'Zea mays L. subsp. mays Ciudad de México, MexicoNC7KERNELS2003DEVELOPEDPRE 04/21/2003Breeding materialAfrica Lowland adaptation, Late maturity, Maize streak virus resistance, B heterotic group1645479PI 690597
4PI 690618'CML 341'Zea mays L. subsp. mays Ciudad de México, MexicoNC7KERNELSNot Available2003DEVELOPEDPRE 04/21/2003Breeding materialLowland adaptation, Drought, Low N resistance, AB heterotic group1645488PI 690618
5PI 595550'CML 277'Zea mays L. subsp. mays Ciudad de México, MexicoNC7KERNELS1996DEVELOPEDBreeding materialLowland tropical white maize inbred line with good general combining ability. Grain yield 2 and standability 2.5 (1 = good, 5 = poor). Days to 50% silk 62. Grain texture semi-flint. Plant height 183 cm. Ear rot 1.7, Puccinia polysora 2.3, and Bipolaris maydis 2.0 (1 = resistant, 5 = susceptible).1525948PI 595550
6PI 506246'Tzi 8'Zea mays L. subsp. mays Oyo, NigeriaNC7EAR1987DONATED01/15/1987Breeding materialPlant maturity late (l20 days). Root lodging resistant. Grain color white. Grain texture flint. Adapted to Tropics. Resistant to maize streak virus (MSV).1401182PI 506246
7PI 506247Tzi 9Zea mays L. subsp. mays Oyo, NigeriaNC7KERNELS1987DONATED01/15/1987Breeding materialnext: Plant maturity medium (105 days). Root lodging resistant. Grain color white. Grain texture dent/flint. Adapted to tropics. Resistant to maize streak virus (MSV).1401183PI 506247