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Selection for low N tolerance in the Thai Maize Breeding Program

By: Chantachume, Y | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): De León, C [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Peña-Valdivia, C.B [eds.] | Grudloyma, P [coaut.] | Kongtian, D [coaut.] | Lothrop, J.E [coaut.] | Manupeerapan, T [coaut.] | Noradechanon, S [coaut.] | Tongchuay, S [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Drought resistance | Drought stress AGROVOC | Selection | CIMMYT | Zea mays AGROVOC | Soil fertility AGROVOC | Genotypes AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: One of the most important factors limiting maize yields in Asia is low soil fertility, especially low N. Inorganic fertilizer use, however, is very limited among farmers because of its high cost. Genetic variation in response to N supply found in many studies suggests it is possible to breed varieties or hybrids with tolerance to low N. Nakhon Sawan Field Crops Research Center (NSFCRC) of the Department of Agriculture of Thailand was invited by the CIMMYT Asian Regional Maize Program (ARMP) to be the key Asian country in selecting for low N tolerance. Collaboration between ARMP's member countries working on this project will be strengthened. Selection for low N tolerance in NSFCRC maize breeding program was initiated in 1995. Two successive crops of maize were planted with no fertilizer in 1995ER and 1995LR to lower the level of soil nitrogen in afield of approximately 0.7 ha. This is considered a N- limited environment and will be used for screening germplasm for tolerance to low N. Germplasm will include inbred lines, varieties and populations from NSFCRC, ClMMYT and ARMP. The features of an ideotype adapted to low N environments will be high grain yield under both -N and +N (non-limited N). The germplasm will be tested for grain yield and other important agronomic characters such as plant height, synchrony of male and female flowering, number of ears per plant and time of senescence and maturity under both N-limited and non-limited environments. Tolerance to low N can be selected for using the combined data from both environments. After 3-4 cycles of selection, the amount of progress will be evaluated and selected lines and improved populations can then be distributed to breeding programs in Asia.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 3O624179
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One of the most important factors limiting maize yields in Asia is low soil fertility, especially low N. Inorganic fertilizer use, however, is very limited among farmers because of its high cost. Genetic variation in response to N supply found in many studies suggests it is possible to breed varieties or hybrids with tolerance to low N. Nakhon Sawan Field Crops Research Center (NSFCRC) of the Department of Agriculture of Thailand was invited by the CIMMYT Asian Regional Maize Program (ARMP) to be the key Asian country in selecting for low N tolerance. Collaboration between ARMP's member countries working on this project will be strengthened. Selection for low N tolerance in NSFCRC maize breeding program was initiated in 1995. Two successive crops of maize were planted with no fertilizer in 1995ER and 1995LR to lower the level of soil nitrogen in afield of approximately 0.7 ha. This is considered a N- limited environment and will be used for screening germplasm for tolerance to low N. Germplasm will include inbred lines, varieties and populations from NSFCRC, ClMMYT and ARMP. The features of an ideotype adapted to low N environments will be high grain yield under both -N and +N (non-limited N). The germplasm will be tested for grain yield and other important agronomic characters such as plant height, synchrony of male and female flowering, number of ears per plant and time of senescence and maturity under both N-limited and non-limited environments. Tolerance to low N can be selected for using the combined data from both environments. After 3-4 cycles of selection, the amount of progress will be evaluated and selected lines and improved populations can then be distributed to breeding programs in Asia.

English

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

Jose Juan Caballero

CIMMYT Publications Collection

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