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Genetic Analysis of Inbred and Hybrid Grain Yield under Stress and Nonstress Environments in Tropical Maize
Drought and low soil N cause significant yield reductions in maize (Zea mays L.) grown in the tropics. Understanding the genetic basis of hybrid performance under these stresses is crucial toExpand
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Identification of quantitative trait loci under drought conditions in tropical maize. 2. Yield components and marker-assisted selection strategies
Abstract In most maize-growing areas yield reductions due to drought have been observed. Drought at flowering time is, in some cases, the most damaging. In the experiment reported here, trials withExpand
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Selection Improves Drought Tolerance in Tropical Maize Populations: II. Direct and Correlated Responses among Secondary Traits
Recurrent selection for drought tolerance for three to eight cycles has increased grain yield (GY) under drought at flowering by 30 to 50% in three lowland tropical maize (Zea mays L.) populations.Expand
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Eight cycles of selection for drought tolerance in lowland tropical maize. II. Responses in reproductive behavior
Abstract Drought stress can greatly reduce grain yields of maize (Zea mays L.) if it coincides with flowering. Eight cycles of full-sib recurrent selection in the population ‘Tuxpeno Sequia’ wereExpand
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Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers
Abstract Molecular-marker loci were used to investigate the adaptation differences between highland and lowland tropical maize. An F2 population from the cross of two inbred lines independentlyExpand
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Interpreting genotype × environment interaction in tropical maize using linked molecular markers and environmental covariables
Abstract An understanding of the genetic and environmental basis of genotype×environment interaction (GEI) is of fundamental importance in plant breeding. In mapping quantitative trait loci (QTLs),Expand
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Improvement for tolerance to low soil nitrogen in tropical maize I. Selection criteria
Abstract Inadequate nitrogen supply limits maize production in much of the tropics because inorganic fertilizer is unavailable or is often costly relative to the expected returns. The objective ofExpand
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Physiological mechanisms contributing to the increased N stress tolerance of tropical maize selected for drought tolerance
Abstract An improved response of crop varieties to various stress factors may be associated to constitutive stress tolerance mechanisms that increase yield and yield stability. Increased leafExpand
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Eight cycles of selection for drought tolerance in lowland tropical maize. III. Responses in drought-adaptive physiological and morphological traits
Abstract Selection for grain yield under severe drought stress has often been considered inefficient because the estimate of heritability of grain yield has been observed to decline as yields fall.Expand
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Drought tolerance improvement in tropical maize source populations: evidence of progress
The objectives of this study were to evaluate direct and correlated responses to recurrent selection for drought tolerance in two CIMMYT maize (Zea mays L.) source germplasm populations, 'DTP1' andExpand
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