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Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments

By: Banziger, M.
Contributor(s): Betrán, F.J [coaut.] | Lafitte, H.R [coaut.].
Material type: materialTypeLabelArticlePublisher: 1997ISSN: 1435-0653 (Revista en electrónico).Subject(s): Maize | Nitrogen | Research projects | Resistance to injurious factors | Selection | Tropical maize CIMMYT | Zea mays AGROVOC In: Crop Science v. 37, no. 4, p. 1103-1109649139Summary: Most maize (Zea mays L.) in the tropics is grown under low-nitrogen (N) conditions, raising the need to assess efficient breeding strategies for such conditions. This study assesses the value of low-N vs. high-N selection environments for improving lowland tropical maize for low-N target environments. Fourteen replicated trials grown under low (no N applied) and high (200 kg N ha(-1) applied) N at CIMMYT, Mexico, between 1986 and 1995 were analyzed for broad-sense heritability of grain yield, genetic correlation between grain yields under low and high N, and predicted response of grain yield under low N to selection under either low or high N, Broad-sense heritabilities for grain yield under low N were on average 29% smaller than under high N because of lower genotypic variances under low N, Error variances were similar at low and high N, Genetic correlations between grain yields under low and high N were generally positive, They decreased with increasing relative yield reduction under low N, indicating that specific adaptation to either low or high N became more important the more low-N and high-N experiments differed in grain yield. Selection under high N for performance under low N was predicted significantly less efficient than selection under low N when relative yield reduction due to N stress exceeded 43%, Maize breeding programs targeting low-N environments in the tropics should include low-N selection environments to maximize selection gainsCollection: CIMMYT Staff Publications Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-1358 (Browse shelf) 1 Available 649139
Total holds: 0

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X

Most maize (Zea mays L.) in the tropics is grown under low-nitrogen (N) conditions, raising the need to assess efficient breeding strategies for such conditions. This study assesses the value of low-N vs. high-N selection environments for improving lowland tropical maize for low-N target environments. Fourteen replicated trials grown under low (no N applied) and high (200 kg N ha(-1) applied) N at CIMMYT, Mexico, between 1986 and 1995 were analyzed for broad-sense heritability of grain yield, genetic correlation between grain yields under low and high N, and predicted response of grain yield under low N to selection under either low or high N, Broad-sense heritabilities for grain yield under low N were on average 29% smaller than under high N because of lower genotypic variances under low N, Error variances were similar at low and high N, Genetic correlations between grain yields under low and high N were generally positive, They decreased with increasing relative yield reduction under low N, indicating that specific adaptation to either low or high N became more important the more low-N and high-N experiments differed in grain yield. Selection under high N for performance under low N was predicted significantly less efficient than selection under low N when relative yield reduction due to N stress exceeded 43%, Maize breeding programs targeting low-N environments in the tropics should include low-N selection environments to maximize selection gains

Research and Partnership Program

English

9710|Crop Science Society of America (CSSA)|EE|R97-98ANALY|Maria|anterior|Fdo|FINAL9798|3

INT1888

CIMMYT Staff Publications Collection

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