Registration of Four Tropical Midaltitude Maize Germplasm Populations

Everett, Leslie A.; Eta‐Ndu, J. T.; Ndioro, M.; Tabi, I.

doi:10.2135/cropsci1994.0011183x003400050072x

Crop Science

1994

DOI: 10.2135/cropsci1994.0011183x003400050072x

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Registration of Four Tropical Midaltitude Maize Germplasm Populations

Leslie A. Everett

J. T. Eta‐Ndu

M. Ndioro

et al.

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“…TZMI730 was derived from a cross of an inbred line from IITA (TZMI407) with a line from CIMMYT (8232/TZMSR‐W/ZM607). The parental lines from IITA were derived from a MSV‐resistant midaltitude population, TZMSR, crosses between lowland MSV‐resistant populations, and midaltitude germplasm from Eastern and Southern Africa as well as germplasm sources from CIMMYT (Kim et al, 1985; Everett et al, 1994a, 1994b, 1994c).…”

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“…Suggs. ], and common rust (caused by Puccinia sorghi Schwein); diseases prevalent in the midaltitude ecology in West and Central Africa (Everett et al, 1994a, 1994b). Lines were released for use as sources of germplasm from 1999 to 2003.…”

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“…Inbred lines were derived from single crosses of midaltitude‐adapted inbred lines and broad‐based populations (Coca‐SR, Early‐W‐SR, and POP 43‐SR) with resistance to MSV (Kim et al, 1985; Everett et al, 1994a, 1994b, 1994c). TZMI711 was derived from a cross between a maize variety grown in Tanzania, called National‐1 Variety, and an IITA MSV‐resistant population (TZSR), which was formed by intercrossing four populations, including TZB, TZPB, POP 21, and POP 22.…”

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Registration of 20 Tropical Midaltitude Maize Line Sources with Resistance to Gray Leaf Spot

Menkir

Adepoju

2005

Crop Science

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Registration of 'Oklee' Wheat relatively early maturing and produces spikes 1.3 d earlier 'Oklee' is a hard red spring wheat (Triticum aestivum L.) than 2375 and 0.6 d earlier than Oxen (PI 596770), the most (Reg. no. CV-963, PI 634553) developed and released by the widely grown cultivar in Minnesota since the late 1990s. Oklee Minnesota Agricultural Experiment Station in cooperation is a semidwarf cultivar and averages 75 cm, the same height with USDA-ARS in January 2003. It was named after a town as Oxen, and is 3 cm shorter than 2375 in Minnesota trials. in its region of adaptation in northwest Minnesota. Oklee was In 35 Minnesota trials conducted from 1998 through 2002, released on the basis of its high grain yield, high grain volume Oklee yielded 3664 kg ha Ϫ1 compared to 3482 kg ha Ϫ1 for weight, high grain protein content, and early maturity. In addi-2375 and 3825 kg ha Ϫ1 for Oxen. Oklee was evaluated in tion, Oklee has moderate resistance to Fusarium head blight 29 environments in the Uniform Regional Hard Red Spring (FHB, caused primarily by Fusarium graminearum Schwabe). Wheat Nursery in 1998 and 1999 and yielded an average of Oklee was derived from the cross '2375'/SBF0670, made 3456 kg ha Ϫ1 compared to an average of 3470 and 3503 kg by the former Pioneer Hi-Bred spring wheat breeding program ha Ϫ1 produced by the check cultivars, 2375 and Verde (PI in the USA. The cultivar 2375 (PI 601477, syn. Pioneer 2375) 592561, Busch et al., 1996), respectively. Oklee has moderately has the pedigree Olaf//Era/Suqamuxi 68/3/Chris/ND487//Lark strong straw and a lodging rating of 2.3 when scored on a and was widely grown in Minnesota during the mid-1990s due scale of 0 (erect) to 9 (lodged) in 21 environments at which to its moderate resistance to FHB. SBF0670 is an unreleased lodging occurred from 1998 thru 2002. By comparison, the line whose pedigree contains hard red spring lines once promicultivars 2375, Oxen, and Verde had lodging ratings of 3.5, nent in the region including 'Chris' (CItr 13751, Heiner and 2.6, and 2.1, respectively. Johnston, 1967), 'Era' (CItr 13986, Heiner and McVey, 1971), Oklee has moderate resistance to FHB in misted, inoculated and 'Butte'. field nurseries, similar to the resistance of 2375. In 11 FHB The F 2 population producing Oklee was selected for leaf nurseries from 1998 through 2001, Oklee averaged 23.6% disrust (caused by Puccinia triticina Eriks.) and stem rust (caused eased spikelets, 16.7% visually scabby kernels (VSK), and by Puccinia graminis Pers.: Pers.) resistance in a field planting 8.8 mg kg Ϫ1 of the mycotoxin deoxynivalenol (DON). The at St. Paul in 1993. The F 3 generation was advanced by single cultivar 2375 averaged 22.7% diseased spikelets, 17.5% VSK, seed descent in a greenhouse. The selection resulting in Oklee and 9.8 mg kg Ϫ1 DON. In the same trials, the resistant check was selected from a single plant in an F 4 headrow in 1994 and 'BacUp' (PI 596533, Busch et al., 1998) and the susceptible this seed was increased in a winter nursery in Arizona during check ...

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Registration of 20 Tropical Midaltitude Maize Line Sources with Resistance to Gray Leaf Spot

Menkir

Adepoju

2005

Crop Science

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“…Additional sub-tropical populations were formed in Cameroon by crossing TZMSR to hybrids from Kenya, Zimbabwe, DEKALB Seed Company, and diverse germplasm from CIMMYT, Tanzania, Kenya, Costa Rica, Guatemala, Brazil, and Thailand. The diverse sub-tropical populations developed in Nigeria and Cameroon had been sources of elite maize inbred lines for developing high-yielding hybrids with resistance to turcicum leaf blight, common rust, grey leaf spot, and the maize streak virus disease for commercialization in the two countries 2,[4][5][6][7] . The most diverse elite maize inbred lines developed in Nigeria and Cameroon prior to 1995 were crossed with each other as well as with introduced and tropical inbred lines as donors of novel alleles to generate source populations for the continual development of elite maize inbred lines with desirable agronomic features, tolerance to drought, resistance to Striga hermonthica, earliness, high lysine, tryptophan, and provitamin A content for two decades.…”

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Genetic structure analysis and identifying key founder inbred lines in diverse elite sub-tropical maize inbred lines

Gedil

Maazou

Zebire

et al. 2023

Sci Rep

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Understanding the genetic relationships between the key founder inbred lines and derived inbred lines could provide insight into the breeding history and the structure of genetic diversity of the available elite inbred lines with desirable target traits. The maize improvement program at the International Institute of Tropical Agriculture (IITA) analyzed the pedigree information of 623 sub-tropical maize inbred lines generated at the IITA maize breeding program to identify the key founder inbred lines. We also used 5032 SNP markers to assess the genetic similarities of the founder inbred lines with their progenies subsequently developed for specific target traits. The results of pedigree analysis and SNP markers-based similarity scores identified 20 key founder inbred lines with significant contributions to the development of drought tolerant, early maturing, productive, Striga resistant, provitamin A enriched, and quality protein maize inbred lines. In our breeding program, line TZMi501 belonging to a flint heterotic group (HGA), and TZMi407-S and TZMi214, representing the dent heterotic group (HGB), were identified as the most useful founder inbred lines. The 623 inbred lines were consistently separated into four clusters based on Ward’s hierarchical clustering, structure, and principal component analyses, with the 20 founder inbred lines spread into all clusters. The founder inbred lines were more genetically related to the productive inbred lines but showed genetic divergence from the provitamin A enriched inbred lines. These results provide a better understanding of the breeding history of the sub-tropical maize inbred lines to facilitate parental selection aligned to existing heterotic groups for use in breeding programs targeting the improvement of essential traits in maize.

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Registration of Four Tropical Midaltitude Maize Germplasm Populations

Cited by 2 publications

References 1 publication

Registration of 20 Tropical Midaltitude Maize Line Sources with Resistance to Gray Leaf Spot

Registration of 20 Tropical Midaltitude Maize Line Sources with Resistance to Gray Leaf Spot

Genetic structure analysis and identifying key founder inbred lines in diverse elite sub-tropical maize inbred lines

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