Person:
Edmeades, G.O.

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Edmeades
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G.O.
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Edmeades, G.O.

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Now showing 1 - 10 of 13
  • Publication
  • Translational research for climate resilient, higher yielding crops
    (Hapres, 2019) Reynolds, M.P.; Borrell, A.; Braun, H.J.; Edmeades, G.O.; Flavell, R.; Gwyn, J.; Jordan, D.; Pixley, K.V.; Rebetzke, G.J.
    Publication
  • Breeding for drought tolerance in tropical maize
    (CIMMYT, 1993) Edmeades, G.O.
    Lecture Notes of the Breeding for Drought Tolerance in Tropical Maize, held in El Batan, Mexico, March 8 - April 2, 1993.
    Publication
  • Mejoramiento y seleccion de maiz tropical para incrementar su resistencia a la Sequía
    (CIMMYT, 1984) Fischer, K.S.; Edmeades, G.O.; Johnson, E.C.
    En las zonas tropicales bajas y humedas, las sequias periodicas de corta duracion causadas por una distribucion irregular de las lluvias, son responsables de reducciones importantes en el rendimiento del maiz. Esto es particularmente cierto cuando la disminucion del agua disponible coincide con el estado critico del desarrollo del cultivo: la floracion. No es posible evitar el escape a tal sequia mediante la madurez del genotipo, la fecha de siembra y tampoco se cuenta con otras especies que esten mejor adaptadas. El mejoramiento de la resistencia del maiz a este tipo particular de sequia podria, por lo tanto, incrementar la productividad y
    Publication
  • Breeding and selection for drought resistance in tropical maize
    (CIMMYT, 1982) Fischer, K.S.; Johnson, E.C.; Edmeades, G.O.
    Throughout the lowland wet tropics, periodic nonprotracted drought caused by irregular rainfall distribution is responsible for sizable reductions in maize yield. This is particularly true when reduced water availability coincides with the critical stage of crop development--flowering. Such a drought cannot be escaped by genotype maturity or planting date, nor are other species necessarily better adapted. Improving resistance of maize to this particular type of drought, then, could enhance productivity and minimize farmer risk. From a comparison of sorghum and maize under drought, it appears that sorghum maintains photosynthesis and growth at lower water
    Publication
  • Performance of early maturing Katumani and Kito maize composites under drought at the seedling and flowering stages
    (African Crop Science Society, 1998) Mugo, S.N.; Smith, M.E.; Banziger, M.; Setter, T.; Edmeades, G.O.; Elings, A.
    Two widely-used open pollinated maize (Zea mays L.) cultivars from East Africa, Katumani and Kito composites, developed and improved for early maturity, grain yield and drought escape were evaluated for drought tolerance at seedling and flowering stages, and compared with other drought tolerant maize populations. Under seedling-stage, the early maturing cultivars were the most drought tolerant with large biomass accumulation in both stress and non-stress environments. However, root weight and the root: shoot ratio were relatively small. Under drought at flowering, these cultivars flowered early and reached anthesis in 66 days (d) for Katumani and 73 d for Kito, compared to an average of 100 d for the trial. Grain yields were (359 kg ha-1 for Katumani and 679 kg ha-1 for Kito) than the trial average of 1002 kg ha-1 under severe stress. Under well-watered conditions the yields were 3,295 kg ha-1 for Katumani, 4,651 kg ha-1 for Kito compared to the trial average of 5,737 kg ha-1. Low grain yield was associated with a large anthesis-silking interval (ASI) of 28 d in Katumani compared to an average of 18 d for the trial; and strong leaf rolling and high leaf abscisic acid concentration. Katumani and Kito were less stable for yield across water availability environments.
    Publication
  • Mejoramiento para aumentar la tolerancia a sequía y a deficiencia de nitrógeno en el maíz: de la teoría a la práctica
    (CIMMYT, 2012) Banziger, M.; Edmeades, G.O.; Beck, D.L.; Bellon, M.
    Este documento, dirigido inicialmente a los mejoradores de maíz en África al sur del Sahara, se basa en un método probado que fue elaborado en el CIMMYT con el fin de mejorar la tolerancia del maíz al estrés por sequía y por deficiencia de nitrógeno. La intención al elaborar este manual fue usarlo como complemento en un curso para mejoradores y agrónomos que ostenten, como mínimo, la licenciatura. Entre los temas tratados se incluyen los efectos que los déficits de agua y de nitrógeno tienen en la planta de maíz; los incrementos de rendimiento que se pueden lograr con la selección; los factores que afectan la intensidad de la sequía y de la deficiencia de N en el maíz; la elección de parcelas que sean adecuadas para realizar la evaluación inicial de la tolerancia a sequía y a deficiencia de N; el manejo que se les da a los ensayos de sequía y bajos niveles de N para lograr un estrés uniforme; el diseño de experimentos y planos de campo apropiados para los ensayos de estrés; la elección y el análisis de datos; y el uso de la evaluación inicial de la tolerancia a sequía y deficiencia de N en un programa fitogenético tradicional.
    Publication
  • Breeding for drought and nitrogen stress tolerance in maize: from theory to practice
    (CIMMYT, 2000) Banziger, M.; Edmeades, G.O.; Beck, D.L.; Bellon, M.
    Targeted initially for maize breeders in sub-Saharan Africa, the content is based on a successful approach developed at CIMMYT for improving the tolerance of maize to drought and low nitrogen stress. Intended as a supplement to a course for breeders and agronomists of at least BSc level, it deals with the effects of water and N deficits on the maize plant, the level of yield increases to be expected from selection, factors that affect the severity of drought and low N stress in maize, selecting suitable fields for drought and low N screening, managing uniform stress in drought or low N experiments, designing effective experiments and field layouts for stress trials, the choice and analysis of data, and the use of drought and low N screening in a normal breeding program.
    Publication
  • World maize facts and trends 1997/98: maize production in drought-stressed environments: technical options and research resource allocation
    (CIMMYT, 1999) Heisey, P.W.; Edmeades, G.O.
    This publication, through its focus on maize production in drought stressed areas of developing countries, explores economic, research, and policy issues related to maize agriculture in marginal areas of the developing world generally. Key questions in the debate over agriculture in marginal vs. favorable production areas are reviewed with a focus on maize. Questions include whether maize production is expanding into marginal areas, if production from such areas is necessary to meet future demand, and what is the relationship between marginal production environments and poverty. Different research resource allocations (leading to technological change) are modeled to compare gains and losses to producers and consumers in marginal, favorable, and urban areas of a country. A Thorough overview of technical constraints and responses for maize production in drought-stressed environments is also presented. The authors conclude that agricultural research for marginal and, particularly, for drought-stressed areas will continue to be justified on the basis of meeting future demand requirements. Evidence that the marginality of agricultural land is related to poverty is decidedly mixed because of a range of factors outside the realm of agroclimatic conditions. To better determine efficient research allocations, considerably more study in this neglected area will be required. Such research should incorporate data from case studies, and more accurate definition of marginal areas provided by data from geographic information systems, crop modeling, and refined economic measures. The publication concludes with a brief overview of the world maize situation in 1997/98, followed by selected statistics on production, consumption, and trade for all regions of the world.
    Publication
  • Developing drought- and low N-tolerant maize: proceedings of a symposium, March 25-29, 1996, CIMMYT, El Batan, Mexico
    (CIMMYT, 1997) Peña-Valdivia, C.B; Developing Drougth- and Low N- Tolerant Maize (March 25-29, 1996 CIMMYT, El Batan, Mexico).; Edmeades, G.O.; Banziger, M.; Mickelson, H.R
    Proceedings of a symposium hosted at CIMMYT in 1996, this publication describes the incidence and intensity of drought and low nitrogen conditions for maize in the tropics, the physiology of drought tolerance and the identification of secondary traits, breeding for drought tolerance, the performance of maize under low nitrogen conditions and breeding for tolerance, general considerations for stress breeding designs and software for experiments in stressed environments, germplasm sources of drought tolerance, and modelling and geographic information system studies
    Publication