Oikeh, S.O. and Menkir, A. and Maziya-Dixon, B. and Welch, R.M. and Glahn, R.P. and Gauch, G.Jr. (2004) Environmental stability of iron and zinc concentrations in grain of elite early-maturing tropical maize genotypes grown under field conditions. Journal of Agricultural Science, 142 (5). pp. 543-551.
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Abstract
Assessment of the stability of micronutrients is important in breeding for the enhanced nutritional quality of staple food crops as a means to alleviate malnutrition. Twenty early-maturing elite tropical maize genotypes were evaluated in Ikenne, Mokwa and Saminaka, representing 3 distinct agroecologies in West and Central Africa, to analyse the pattern of genotype × environment interactions (GEI) and environmental stability of iron (Fe) and zinc (Zn) concentrations in grains using the additive main effects and multiplicative interaction (AMMI) statistical models. The effects of genotypes, environments and GEI were significant (P<0.05) for both micronutrients. The effect of GEI was approximately double the contribution of the genotypes for grain iron and more than double the effect of genotypes for grain zinc. Partitioning of GEI indicated that variety × location was the dominant source of a significant amount of GEI for both micronutrients. Scores of the first 2 interaction principal component axes (IPCA1 and IPCA2) from the AMMI were significant and accounted for 0.68-0.75 of the pattern of GEI for both micronutrients. Approximately one-half of the genotypes evaluated were stable for grain Fe and Zn concentration over the set of environments. The AMMI model identified ACR98TZEMSR-W as the most stable genotype for grain Fe and MAKA-SRBC5 was the most stable for grain Zn. However, the yellow genotype, AK94-DMR-ESR-Y was the most promising, with high and moderately stable concentrations of Fe and Zn in the grain. Because it is yellow, with beta-carotene content and high concentrations of Fe and Zn in the grain, it might significantly contribute to an improved intake of these micronutrients in populations who rely on maize as a major portion of their daily diet
| Item Type: | Article |
|---|---|
| Author Affiliation: | USDA-ARS, PSNL, Cornell University, Tower Road, Ithaca, NY, 14853, USA |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | Maize |
| Depositing User: | Syamala |
| Date Deposited: | 15 Feb 2011 17:26 |
| Last Modified: | 15 Feb 2011 17:26 |
| Official URL: | http://dx.doi.org/10.1017/S0021859604004733 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1526 |
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