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Garlic Sulphur Biochemistry

Workpackage Four. Garlic Sulphur Biochemistry. Partner 2: Horticulture Research International Laurence Trueman , Brian Thomas, Linda Brown, Brian Smith, & Gareth Griffiths. Objective: 2. To identify developmental control points for CSO synthesis. Milestones May 2000 - Feb. 2001

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Garlic Sulphur Biochemistry

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  1. Workpackage Four Garlic Sulphur Biochemistry Partner 2: Horticulture Research International Laurence Trueman, Brian Thomas, Linda Brown,Brian Smith, & Gareth Griffiths

  2. Objective: 2 To identify developmental control points for CSO synthesis Milestones May 2000 - Feb. 2001 Experimental material planted and harvests begun.

  3. Strategy: To profile and track sulphur compounds in leaf, leaf bases, root and clove • Outline of intended work • Development of hydroponic system • Garlic grown to maturity in test system Report given at Dijon

  4. Experimental material planted... • Accessions used: Printanor and Messidrome • Planted first two weeks of December • Growth media: Hydroponic • Position: Greenhouse • Controls: Pot grown garlic • Field grown controls abandoned due to very wet winter

  5. Harsh Winter conditions in the UK

  6. Growth conditions • Two full hydroponic systems constructed • Nutrient medium is a 1/2 strength modified Hewitts solution

  7. Hydroponic verses Pot-grown

  8. Hydroponic verses Pot-grown - Mean (n=3) leaf size (28-3-2001)

  9. Hydroponic verses Pot-grown - Mean leaf size (Hydroponic 26-2-01, Pot 28-3-01)

  10. Growth characteristics • Approximately 2-3 leaves ahead - effectively 31 days • Little morphological difference although chlorophyl content appears to differ • Hydroponic garlic sprouted earlier than controls (Printanor 25d, Messidrome 15d) • Due to higher temperature of hydroponic system?

  11. ...and harvests begun Sampling strategy • At the (visable) emergence of each leaf • 3 plants (Printanor), 2 plants (Messidrome) • Equal number pot-grown controls • Plants divided into leaf base and/or clove, leaf and root material • Material stored at -40oC whilst awaiting analysis

  12. Sample analysis • Leaf length (ruler) • Dry weight (freeze drying) • Soluble protein (bicinchoninic acid assay) • Chlorophyl content (Arnon assay) • Total nitrogen (combustion analysis) • Total sulphur (inductively coupled plasma atomic emission spectrophotometer) • Cysteine sulphoxide analysis using a (methanol extraction followed by quantification using HPLC)

  13. CSO analysis 4.271 methiin 4.745 ethiin 5.531 alliin 6.588 propiin Hydroponic garlic Standards

  14. Summary of CSO results Shop bought, hydroponically grown garlic

  15. The two storage organs of garlic Under extreme conditions garlic plants can form an intermediate bulbing structure consisting of a swollen leaf base surrounding the meristem

  16. Garlic variety “Solo”

  17. Comparison of CSO composition hydroponically grown garlic and “Solo”

  18. Objective: 2 To identify developmental control points for CSO synthesis Milestones May 2000 - Feb. 2001 Experimental material planted and harvests begun 

  19. Objective: 2 To identify developmental control points for CSO synthesis • First year harvests and analysis completed. • Second year experimental material planted Milestones Feb. 2001 - 2002

  20. Objective: 3b To isolate and characterise alliinase cDNA clones • To construct a cDNA library from actively synthesizing tissues Milestones May 2000 - Feb 2001

  21. Spontaneous Spontaneous Flavour generation in Allium S-alk(en)yl-L-Cysteine Sulphoxides Alliinase Sulphenic acids + Aminoacrylic acid Thiosulphinates Pyruvic Ammonia acid Other sulphur-containing flavour compounds

  22. Two cDNA libraries have been constructed from cv Messidrome from RNA extracted from leaf and bulb tissue from actively growing plants

  23. cDNA library Statistics • Range of insert sizes: 400-3000bp • Number of indepentent clones • bulb 2.22x106 • leaf 2.28x106 • 1x106 clones from each library have been amplified. • Aliquots stores at -80oC in 7% DMSO

  24. Objective: 3b To isolate and characterise alliinase cDNA clones • To construct a cDNA library from actively synthesizing tissues Milestones May 2000 - Feb 2001 

  25. Objective: 3b To isolate and characterise alliinase cDNA clones • cDNA clones encoding alliinase isolated and sequenced Milestones Feb. 2001 - 2002

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