TY  - JA
AU  - Banziger,M.
AU  - Betran,F.J.
AU  - Lafitte,H.R.
TI  - Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments
SN  - 1435-0653
PY  - 1997///
CY  - USA
PB  - CSSA, Wiley
KW  - Maize
KW  - AGROVOC
KW  - Tropical zones
KW  - Nitrogen
KW  - Nutrient deficiencies
KW  - Yields
KW  - Heritability
KW  - Cross-breeding
KW  - Artificial Selection
KW  - Tropical maize CIMMYT
N1  - Peer review; Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X
N2  - 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
UR  - https://hdl.handle.net/20.500.12665/899
DO  - https://doi.org/10.2135/cropsci1997.0011183X003700040012x
T2  - Crop Science
ER  -