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Field work

Three field trials have been conducted on lettuce variety sets from 2007-2009 which include; lettuce diversity trial, lettuce discolouration assessment trial and lettuce discolouration assessment trial.


Lettuce diversity trial

This trial was conducted at Warwick HRI during summer 2007 in 'Sheep Pens West' trial site.

Post harvest discolouration was induced in a lettuce diversity set and discolouration phenotypically assessed using an objective scoring system. Lettuce was harvested, cut and bagged, and then stored in the fridge as in supermarkets. ANOVA showed there was significant genetic variability between the two mapping parents permitting further genetic analysis.

See trial slideshow.
























Lettuce discolouration assessment trial

This trial was split into two smaller trials with one at Warwick HRI in 'Big Cherry' trial site in the UK and one at Rijk Zwaan 'experimental' field site in the Netherlands during summer 2008.

Post harvest discolouration was then induced in the lettuce mapping population of Iceberg x Saladin and discolouration phenotypically assessed as for the trial in 2007. ANOVA showed there were diferences between the two mapping parents for discolouration overall and between field sites: this led to the generation of QTLs.

See UK trial slideshow.

See NL trial slideshow.


Intense lettuce discolouration assessment trial

This trial is currently in the field at Warwick HRI 'Pump Ground' site. It will look at the discolouration of lines from the mapping population which appear to be extreme as the 2007 and 2008 trials.


Leaf disc pinking assessment

A new quantitative scoring system for pinking has been developed for leaf discs.

The lettuce mapping population parents Saladin and Iceberg have shown differences for type of pinking in addition to degree of pinking seen through the field trials.

It is also interesting to note that browning can not be visualised through this method.

Leaf Discs
Saladin Iceberg


As the current findings have not yet been published this page will be limited in detail. To request further information please contact Laura Atkinson.

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