Registration of 18 First‐Cycle Tropical Midaltitude Maize Germplasm Lines

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

doi:10.2135/cropsci1994.0011183x003400050074x

Cited by 9 publications

(10 citation statements)

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“…Although most of the inbred lines from the two breeding programmes share common germplasm in their parentage (Kim et al, 1985;Everett et al 1994aEverett et al , 1994b, the average GD between lines from the two breeding programmes was as high as or higher than the average GD among lines within each breeding programme, possibly due to divergent selection for adaptation and other desirable agronomic features in each country. It is also noteworthy that inbred lines originating from the same breeding programme clustered together even when they share a common parentage with lines from the other breeding programme.…”

Section: Discussionmentioning

confidence: 99%

“…The major source of the inbred lines, TZMSR, was a midaltitude adapted population formed by crossing the best varieties and hybrids from eastern, southern and central Africa to a maize streak virus-resistant germplasm (IITA 1984). The streak-resistant 1994a, 1994bKim et al unpublished). Each of the 38 inbred lines was crossed to two tester lines, TZMI102 and TZMI407, representing each side of the flint and dent heterotic pattern, respectively, in the 1998/1999 dry seasons to generate 76 testcrosses for evaluation in the 1999 and 2000 main cropping seasons.…”

Section: Genetic Materialsmentioning

confidence: 99%

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Grouping of tropical mid-altitude maize inbred lines on the basis of yield data and molecular markers

et al. 2004

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The classification of maize inbred lines into heterotic groups is an important undertaking in hybrid breeding. The objectives of our research were to: (1) separate selected tropical mid-altitude maize inbred lines into heterotic groups based on grain yield data; (2) assess the genetic relationships among these inbred lines using amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers; (3) examine the consistency between yield-based and marker-based groupings of the inbred lines. Thirty-eight tropical mid-altitude maize inbred lines were crossed to two inbred line testers representing the flint and dent heterotic pattern, respectively. The resulting testcrosses were evaluated in a trial at three locations for 2 years. Significant general combining ability (GCA) and specific combining ability (SCA) effects for grain yield were detected among the inbred lines. The tester inbred lines classified 23 of the 38 tested inbred lines into two heterotic groups based on SCA effects and testcross mean grain yields. This grouping was not related to endosperm type of the inbred lines. The outstanding performance of testcrosses of the remaining 15 inbred lines indicates the presence of significant genetic diversity that may allow the assignment of the lines into more than two heterotic groups. Diversity analysis of the 40 maize inbred lines using AFLP and SSR markers found high levels of genetic diversity among these lines and subdivided them into two main groups with subdivision into sub-groups consistent with breeding history, origin and parentage of the lines. However, heterotic groups formed using yield-based combining ability were different from the groups established on the basis of molecular markers. Considering the diversity of the genetic backgrounds of the mid-altitude inbred lines, the marker-based grouping may serve as the basis to design and carry out combining ability studies in the field to establish clearly defined heterotic groups with a greater genetic similarity within groups.

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Section: Discussionmentioning

confidence: 99%

Section: Genetic Materialsmentioning

confidence: 99%

Grouping of tropical mid-altitude maize inbred lines on the basis of yield data and molecular markers

et al. 2004

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“…Eight lines are of temperate exotic origin, developed at the University of Novi Sad in Serbia. Seven were developed in Cameroon through joint cooperation of the International Institute of Tropical Agriculture (IITA) and the Cameroon Institute of Agronomic Research (IRA) (Everett et al, 1994a, 1994b). Four were developed by Hans Gevers at the Agricultural Research Council's (ARC) Grain Crop Institute in South Africa.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Elite Exotic Maize Inbreds for Use in Temperate Breeding

Nelson

Goodman

2008

Crop Science

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While maize (Zea mays L.) is a highly diverse species, this diversity is not well represented in U.S. maize production acreage. Increased genetic diversity can be obtained through breeding with exotic germplasm, especially tropical‐exotic sources. However, the pool of available tropical germplasm is large and diverse, making choices of tropical parents difficult. The maize breeding program at North Carolina State University has initiated a large‐scale screening effort to evaluate elite exotic maize inbreds, most of which are tropical‐exotic in origin. Here we report screening results for 88 inbreds obtained from various international breeding programs. These lines were tested in replicated yield trials in North Carolina as 50% exotic topcrosses by crossing them to a single‐cross U.S. tester of stiff‐stalk (SS) by non‐stiff‐stalk (NSS) origin. The more promising lines additionally entered 25% tropical topcrosses with SS and NSS testers and were further evaluated in yield‐trials. A handful of tropical inbred lines—CML10, CML108, CML157Q, CML274, CML341, CML343, and CML373—performed well overall. It was further determined that topcrossing to a single SS by NSS tester will suffice for initial screening purposes, allowing for elimination of the poorest performing lines. Topcrossing to additional SS and NSS testers may be of value when determining where, in terms of heterotic patterns, the better‐performing lines will fit into a breeding program.

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“…The Striga resistant or tolerant inbred lines adapted to the midaltitudes (TZSTRI118 TZSTRI126) were identified from trials involving a large number of elite inbred lines tested at Abuja and Mokwa under Striga infestation. These lines were derived mainly from single crosses between midaltitude adapted inbred lines from IITA (Everett et al, 1994a, 1994b). The selected inbred line were evaluated as lines per se at Abuja and Mokwa for 3 yr. As shown in Table 3, the susceptible lowland inbred line (5057) sustained 84% yield loss under Striga infestation, suffered high Striga damage, and supported a large number of Striga plants.…”

Section: Means Of Lowland Adapted Striga Resistant Maize Inbred Linesmentioning

confidence: 99%

Registration of 26 Tropical Maize Germplasm Lines with Resistance to Striga hermonthica

et al. 2006

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Registration of 18 First‐Cycle Tropical Midaltitude Maize Germplasm Lines

Cited by 9 publications

References 0 publications

Grouping of tropical mid-altitude maize inbred lines on the basis of yield data and molecular markers

Grouping of tropical mid-altitude maize inbred lines on the basis of yield data and molecular markers

Evaluation of Elite Exotic Maize Inbreds for Use in Temperate Breeding

Registration of 26 Tropical Maize Germplasm Lines with Resistance to Striga hermonthica

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