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Vasal, S.K.

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Vasal
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S.K.
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Vasal, S.K.

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1992 - 199922000 - 20061
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Region: Global × Author: Cordova, H.S. ×

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    Incorporation of elite subtropical and tropical maize germplasm into elite temperate germplasm
    (Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 2006) Whitehead, F.C.; Caton, H.G.; Hallauer, A.R.; Vasal, S.K.; Cordova, H.S.
    Elite germplasm and adequate genetic variation are essential in successful plant breeding programs.Maize (Zea mays L.) breeding programs in the U.S. Corn Belt have realized significant genetic advance with a limited sample of the available maize germplasm. The objective of our study was the incorporation of elite subtropical and tropical germplasm into elite U.S. Corn Belt germplasm. Crosses, backcrosses, and testcrosses were evaluated to identify superior progenies that were intermated to form germplasm sources that include 75% temperate germplasm and either 25% subtropical or 25% tropical germplasm. Backcrosses (25%) and testcrosses (12.5%) with 25% exotic germplasm had maturities and agronomic traits similar to the elite temperate germplasm sources. The populations formed by intermating the superior backcross progenies, based on backcross and testcross data, will provide additional germplasm resources for future use in temperate maize breeding programs.
    Publication
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    Inbred line evaluation nurseries and their role in maize breeding at CIMMYT
    (Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 1999) Vasal, S.K.; Srinivasan, G.; Cordova, H.S.; Pandey, S.; Jeffers, D.P.; Bergvinson, D.J.; Beck, D.L.
    CIMMYT initiated its hybrid maize (Zea mays) research programme in 1985 in response to the growing needs of the national programmes for hybrid-oriented source germplasm. Since 1991 CIMMYT has released a total of 424 inbreds that are widely distributed and used by public and private sector researchers around the world. Inbred line evaluation nurseries are an important component of a hybrid research programme. At CIMMYT, inbreds are routinely evaluated for various biotic and abiotic stresses, their yield potential and other agronomic attributes. Several promising lines have been identified for specific stresses, although they were not selected during the development process which can be attributed to the genetic diversity of CIMMYT's source germplasm. Resistant/tolerant lines have been identified for abiotic stresses (drought, low-N use efficiency and acid soils). In addition, resistant lines have been identified for biotic stresses, including fusarium ear/stalk rot (Fusarium spp.), banded leaf and sheath blight (Rhizoctonia spp.), tar spot (Phyllachora maydis), grey leaf spot (Cercospora zeae-maydis), rust (Puccinia polysora), maize streak virus (MSV), fall armyworm (Spodoptera frugiperda), sugarcane borer (Diatraea saccharalis) and Striga. Lines with above average general combining ability and yield stability were identified. These lines are available for public use
    Publication
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    Heterotic patterns of ninety-two white tropical CIMMYT maize lines
    (Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 1992) Vasal, S.K.; Srinivasan, G.; Pandey, S.; Cordova, H.S.; Han, G.C.; Gonzalez Ceniceros, F.
    Development of inbread-based populations which are heterotic to each other was considered one of the primary goals when CIMMYT started of this study were to determine the combining ability and heterotica patters of tropical maize(Zea mays L.) inbred lines developed at CIMMYT and to identify and form beterotic grous for the topics. 92 tropical late white inbred lines at S3-S6 levels of inbreeding derived from nine CIMMYT populations and pools were crossed to four tester lines(two dent and two flint).
    Publication