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Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu
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Environmental characteristisation for genotype by environment matching. SIMLESA workshop. Solomon Fekybelu

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  • Maize breeding focuses at NQLD (high rainfall area) & South, central (drier) environments
  • As you know crop grow in various type of contrasting environments. Plant breeders target a certain population of environment which correspond to the set of env. that crops might experienced within a defined geographic area that they’re interesting in. Breeders usually target a certain population of environments which reflect/integrate/gather/correspond the different environments to which their released cultivar will be exposed to. Comstock gave a definition of the TPE in 1977, saying that they correspond to the complete set of environment types in which crop can be grown within a geographical ares. Identification of the location
  • E1-no stress, e2 flowering stress, e3-mild terminal, e4 moderate and
  • Traits like ‘stay green’ may help with terminal stress Matching phenology may require developing quick maturing genotypes G-M for each target environment to enhance productivity and profitability of growing maize
  • Transcript

    • 1. Solomon Fekybelu, Yash Chauhan, Daniel Rodriguez, John Dimes SIMLESA workshop, Brisbane, Sep. 2011 Environmental characterisation for genotype by environment matching  
    • 2. E-characterization using simulation models
      • helps identify stress types & frequency
      • Comprehensive
      • cheaper
      Temp/Radiation. Rain Soil
    • 3.
      • Simulations (APSIM)
      • 32 soil-site combinations (environments)
      • 1890-2010 climate records used
      • ‘ best bet management’
      • Simulations outputs :
      • Simulated yield
      • Water supply demand ratios for Pioneer hybrid 3153
      • Statistics : Cluster analysis
      Approaches of E-characterization
    • 4. Clustering of probability distribution of simulated yield
    • 5. Yield cluster distribution follows a geographical pattern
    • 6. Environment stress patterns
    • 7. Clusters 4 & 5 have higher frequencies of terminal drought (sky blue and purple sections) No stress Mild Moderate Severe Flowering
    • 8. Over 80% the variability in yield across environments was accounted by drought frequencies in those environments
    • 9. Summary
      • The traditional maize breeding trial sites don't represent the potential TPE for maize in NE Australia
      • Drought seems to contribute to over 80% of production risk to maize in different environments in north-eastern Australia
      • Characterization drought frequencies will enhance our ability to breed, select and target drought tolerant/resistant germplasm in different environments
      • Combined analyses of G-M-E may help identify the most profitable scenarios, E.g. matching phenology with seasonal available soil moisture to minimize yield variability between seasons
    • 10. Thank you

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