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Drought tolerance and low N testing networks: Past, present and future

By: Edmeades, G.O | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Beck, D.L [coaut.] | Chapman, S.C [coaut.] | Cortés C., M [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Peña-Valdivia, C.B [eds.] | Banziger, M.
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Drought resistance | Drought stress AGROVOC | Germplasm | Selection | CIMMYT | Zea mays AGROVOC | Hybrids AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: A goal of the UNDP Stress Project has been to establish networks of collaborating scientists interested in developing drought- or low N-tolerant maize germplasm. These complement the activities of several other general or stress-related testing networks that CIMMYT has developed. The objectives of these networks are to: a) improve national program awareness of, and access to, germplasm possessing superior levels of tolerance to these stresses; b) broaden adaptation of ClMMYT's stress-tolerant source germplasm; and c) exchange germplasm and information among network members. Three sets of trials (1989; 1992; 1995-96) have been shipped to members of the drought tolerance network, and one set (1995-96) to low N-tolerance network members. Participants in the networks total around 32 in 26 countries for drought and 20 in 15 countries for low N. The first and second sets of drought trials were of late and early open pollinated varieties (OPVs), along with a progeny trial of 222 52 families from the Drought Tolerant Population-1(DTP1). Enthusiasm for the networks was shown by the seed requests which followed these trials, and the marked improvement in data received over the years. In the 1992 trials the highest yielding entries across sites were La Posta Sequia C3 (late), a DTP1 early selection and Pool 18 Sequia C3 (early). The composition of the trials has now changed, along with ClMMYT's breeding strategy. The 1995-96 drought trials consist of two topcross progeny trials (yellow; white) and three variety trials (late; early and extra-early, hybrids and OPVs in the same trial, plus two to three collaborator-supplied checks). Trials shipped to Low N network participants consist of two topcross progeny trials, the same early variety trial (drought tolerant germplasm performs well under low N), and a late-maturity variety trial consisting of low N-tolerant entries. CIMMYT will continue to develop and test germplasm with improved levels of drought and N-tolerance at sites which are specifically managed to provide genetic expression for stress-tolerant traits. Such sites will be linked to regional breeding programs so that germplasm with greater local adaptation becomes the focus of improvement.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available 2W624179
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A goal of the UNDP Stress Project has been to establish networks of collaborating scientists interested in developing drought- or low N-tolerant maize germplasm. These complement the activities of several other general or stress-related testing networks that CIMMYT has developed. The objectives of these networks are to: a) improve national program awareness of, and access to, germplasm possessing superior levels of tolerance to these stresses; b) broaden adaptation of ClMMYT's stress-tolerant source germplasm; and c) exchange germplasm and information among network members. Three sets of trials (1989; 1992; 1995-96) have been shipped to members of the drought tolerance network, and one set (1995-96) to low N-tolerance network members. Participants in the networks total around 32 in 26 countries for drought and 20 in 15 countries for low N. The first and second sets of drought trials were of late and early open pollinated varieties (OPVs), along with a progeny trial of 222 52 families from the Drought Tolerant Population-1(DTP1). Enthusiasm for the networks was shown by the seed requests which followed these trials, and the marked improvement in data received over the years. In the 1992 trials the highest yielding entries across sites were La Posta Sequia C3 (late), a DTP1 early selection and Pool 18 Sequia C3 (early). The composition of the trials has now changed, along with ClMMYT's breeding strategy. The 1995-96 drought trials consist of two topcross progeny trials (yellow; white) and three variety trials (late; early and extra-early, hybrids and OPVs in the same trial, plus two to three collaborator-supplied checks). Trials shipped to Low N network participants consist of two topcross progeny trials, the same early variety trial (drought tolerant germplasm performs well under low N), and a late-maturity variety trial consisting of low N-tolerant entries. CIMMYT will continue to develop and test germplasm with improved levels of drought and N-tolerance at sites which are specifically managed to provide genetic expression for stress-tolerant traits. Such sites will be linked to regional breeding programs so that germplasm with greater local adaptation becomes the focus of improvement.

Research and Partnership Program

English

9802|AGRIS 9702|anterior|R97-98PROCE|FINAL9798

Jose Juan Caballero

INT1888

CIMMYT Publications Collection

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