| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a State Plant Breeding Institute, Univ. of Hohenheim, D-70593 Stuttgart, Germany
b AgReliant Genetics, Westfield, IN 46074, USA
c KWS SAAT AG, 37555 Einbeck, Germany
* Corresponding author (presterl{at}uni-hohenheim.de)
Maize (Zea mays L.) cultivars with improved N-use efficiency would be beneficial for low-input production systems. Our objective was to estimate quantitative genetic parameters to optimize breeding programs for improving productivity under low N levels. Results of 21 field experiments with European breeding materials belonging to the flint and dent gene pool are presented. The study was performed during 1989 and 1999 at several locations in typical maize growing regions of Germany and France. All experiments were conducted at high (HN) and low (LN, no N fertilizer applied) N levels. Average grain yield was reduced by 37% at LN compared with HN. Coefficients of genotypic correlation between HN and LN were variable with an average of rG = 0.74 for grain yield and generally high for grain dry matter content. For grain yield, analyses of variance were computed from relative data, where plot values were expressed as percentage of the trial mean. Variances caused by genotype (G), G x location (L) interaction, and error effects were higher at LN compared with HN, with similar heritabilities at both N levels. For the untransformed data, components of variance were higher at HN than at LN. Genotype x N as well as G x L x N level interaction variances were significant in most experiments. Efficiency of improvement of grain yield at LN through indirect selection at HN was 70% compared with direct selection at LN. A trend toward increased efficiency of direct selection under LN conditions was evident with decreasing grain yield at LN.
Abbreviations: HN, High N level • LN, Low N level
This article has been cited by other articles:
|
|
 |
|
  T. Lemaitre, L. Gaufichon, S. Boutet-Mercey, A. Christ, and C. Masclaux-Daubresse Enzymatic and Metabolic Diagnostic of Nitrogen Deficiency in Arabidopsis thaliana Wassileskija Accession Plant Cell Physiol., July 1, 2008; 49(7): 1056 - 1065. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 R. E. Lorenzana and R. Bernardo Genetic Correlation between Corn Performance in Organic and Conventional Production Systems Crop Sci., May 1, 2008; 48(3): 903 - 910. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B. Hirel, J. Le Gouis, B. Ney, and A. Gallais The challenge of improving nitrogen use efficiency in crop plants: towards a more central role for genetic variability and quantitative genetics within integrated approaches J. Exp. Bot., July 1, 2007; 58(9): 2369 - 2387. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Worku, M. Banziger, G. S. a. Erley, D. Friesen, A. O. Diallo, and W. J. Horst Nitrogen Uptake and Utilization in Contrasting Nitrogen Efficient Tropical Maize Hybrids Crop Sci., March 1, 2007; 47(2): 519 - 528. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Brancourt-Hulmel, E. Heumez, P. Pluchard, D. Beghin, C. Depatureaux, A. Giraud, and J. Le Gouis Indirect versus Direct Selection of Winter Wheat for Low-Input or High-Input Levels Crop Sci., May 27, 2005; 45(4): 1427 - 1431. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
