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Landraces : Infra-specific Diversity & Adaptive Divergence

Landraces : Infra-specific Diversity & Adaptive Divergence. Of an Endangered Evolutionary Link [1]. Main Objective. Debate the status, value, relevance & utility of LRs of major & minor crops in the 21 st Century. Indigenous Farming Communities.

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Landraces : Infra-specific Diversity & Adaptive Divergence

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  1. Landraces: Infra-specific Diversity & Adaptive Divergence Of an Endangered Evolutionary Link [1]

  2. Main Objective • Debate the status, value, relevance & utility of LRs of major & minor crops in the 21st Century.

  3. Indigenous Farming Communities • Contributed, for millennia, to the evolution, enrichment, & in situ conservation of crop LRs.

  4. Landraces • Genetically heterogeneous populations comprising inbreeding lines & hybrid segregates which have evolved over 1000’s of years in a multitude of environments and local farming systems. • Developed abundant patterns of variation, & represent a largely untapped reservoir of useful genes for adaptation to biotic & abiotic stresses.

  5. LRs • Landrace cultivation has been discouraged in many developing countries: • Low yield potential. • Susceptibility to diseases.

  6. LRs • Make up <30% of germplasm collections in genebanks • Loss of their GD • genetic erosion on the farm & • genetic drift upon regeneration and seed increase cycles. • Need for on-farm conservation.

  7. Specific Objectives • Assess infra-specific diversity in LRs of major & minor crop species. • Quantify levels of divergence for and adaptive value of agronomic, biochemical & molecular traits. • Assess LR germplasm status in ex situ & how ex situ conservation affects LR diversity & utilization.

  8. Specific Objectives • Evaluate farmers’ efforts to conserve LRs. • Assess the impact of plant breeding on LR diversity in LDCs. • Strategies to promote LR use as a source of broad GD in agriculture at different levels (farming system, farm & species)

  9. Questions • 1. What are wheat landraces; why they are important; what is their potential? • 2. Practical Guidelines – How to restore & maintain LRs on the farm?, and • 3. How to restore community seed systems?

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