Landraces infra specific diversity adaptive divergence
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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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Landraces infra specific diversity adaptive divergence

Landraces: Infra-specific Diversity & Adaptive Divergence

Of an

Endangered Evolutionary Link

[1]


Main objective

Main Objective

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


Indigenous farming communities

Indigenous Farming Communities

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


Landraces

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.


Landraces infra specific diversity adaptive divergence

LRs

  • Landrace cultivation has been discouraged in many developing countries:

    • Low yield potential.

    • Susceptibility to diseases.


Landraces infra specific diversity adaptive divergence

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.


Specific objectives

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.


Specific objectives1

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)


Questions

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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