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GBR006 2007 Discoloration lettuce

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GBR006 2007 Discoloration lettuce Powered By Docstoc
					Institute:                             Warwick HRI
Country:                               United Kingdom
Contact:                               Dave Pink


Experiment description
The trial was conducted during the 2007 growing season on the experimental site Sheep Pens (west) at Warwick
HRI, UK (Latitude: 52.183. Longitude: 1.583). The trial was designed in 3 blocks, each block containing a single
plot of 28 lines randomised in an alpha design. The trial was planted on 1st May 2007, with lettuce transplants
raised under glasshouse conditions. Each plot contained 12 plants (4 x 3) of the same accession with 35 cm
between each plant (central plants were therfore self-guarded to avoid ‘edge’ effects). Fencing and flappers
surrounded the land to provide protection from the local fauna, and plants treated with protective sprays as
information was released on the UK HDC Pest Bulletin (www2.warwick.ac.uk/fac/sci/whri/hdcpestbulletin/)
according to good agricultural practice. Plants were irrigated through an oscillating line as required for
establishment (although no soil moisture deficit was recorded the land was irrigated to bring it near field capacity
prior to transplanting), and irrigation stopped 7 days before harvest. The trial was harvested 30th May, 5th June,
12th June and 19th June 2007 depending on maturity fo individual accessions with all replicates of an accession
assessed onthe same date. On harvest day the central two replicated heads per plot were cut at soil level and the


Descriptor list

Mean score browning intensity          Mean score pinking intensity
Data for Day 3 gave best               Data for Day 3 gave best
discrimination between accessions      discrimination between accessions
mean browing score / number of         mean pinkingscore / number of
grid squares showing                   grid squares showing
browning                               pinking



Scoring protocol                                      Bag ID




                                                     BROWN
on on the experimental site Sheep Pens (west) at Warwick
al was designed in 3 blocks, each block containing a single
 ial was planted on 1st May 2007, with lettuce transplants
 ed 12 plants (4 x 3) of the same accession with 35 cm
 uarded to avoid ‘edge’ effects). Fencing and flappers
al fauna, and plants treated with protective sprays as
   (www2.warwick.ac.uk/fac/sci/whri/hdcpestbulletin/)
 igated through an oscillating line as required for
corded the land was irrigated to bring it near field capacity
  fore harvest. The trial was harvested 30th May, 5th June,
  o individual accessions with all replicates of an accession
   two replicated heads per plot were cut at soil level and the



                        Mean score total discoloration
                        intensity                                 %browning
                        Data for Day 3 gave best                  Data for Day 3 gave best
                        discrimination between accessions         discrimination between accessions
                        meanscore total discoloration of any      100 x (number of grid squares with
                        type squares showing
                        grid / number of                          browning / 12
                        any form of discoloration




                                        Clean                                      0
                                        Visible                                    1
                                        Slight                                     2
                                       Intense                                     4

                        Sample score grid for a single bag representing the discolouration. Where / is score not possible and italicised text is output score
                      %pinking                               %total discoloration
                      Data for Day 3 gave best               Data for Day 3 gave best
                      discrimination between accessions      discrimination between accessions
                      100 x (number of grid squares with     100 x (number of grid squares with
                      pinking / 12                           any form of discoloration / 12


                                                                                                           PINK
                                      Clean                                  Visible              Slight
                                        0                                       1                   50
                                        0                                       /                  50
                                        /                                       1                  51
                                        2                                      12                  52
                                        4                                      14                  54

colouration. Where / is score not possible and italicised text is output score
PINK
       Intense
          70
         70
         71
         72
         74
Lettuce

INSTCODE      ACCENUMB            SPECIES            SUBTAXA   ACCNAME



GBR006        HRIGRU 001066       Lactuca sativa               Webbs Wonderful
GBR006        HRIGRU 001228       Lactuca sativa               Red Grenoble
GBR006        HRIGRU 001474       Lactuca sativa               Waldmanns Dark Green
GBR006        HRIGRU 001683       Lactuca sativa               Romanie de Benicardo
GBR006        HRIGRU 001735       Lactuca sativa               New Chicken
GBR006        HRIGRU 001783       Lactuca sativa               Wunder von Stuttgart
GBR006        HRIGRU 001861       Lactuca sativa               Batavia Blondede Paris
GBR006        HRIGRU 002492       Lactuca sativa               Stoke
GBR006        HRIGRU 004435       Lactuca sativa               Merveille des Quatre Saisons
GBR006        HRIGRU 004986       Lactuca sativa               Batavia Tezier
GBR006        HRIGRU 005048       Lactuca sativa               Ambassador
GBR006        HRIGRU 005095       Lactuca serriola             L.serriola
GBR006        HRIGRU 005491       Lactuca sativa               Lilian
GBR006        HRIGRU 005492       Lactuca sativa               Lobjoits Green Cos
GBR006        HRIGRU 012675       Lactuca sativa               Little Gem
GBR006        HRIGRU 013825       Lactuca sativa               Adriatica 2
GBR006        HRIGRU 013979       Lactuca sativa               Saladin HRI mapping parent
GBR006        HRIGRU 013980       Lactuca sativa               Iceberg HRI mapping parent
GBR006        HRIGRU 001206       Lactuca sativa               Bloody Warrior
GBR006        HRIGRU 004480       Lactuca sativa               Chinese Stem Lettuce
Moles Seeds   control             Lactuca sativa               Lollo Biondo
Moles Seeds   control             Lactuca sativa               Lollo Rossa
Rijk Zwaan    control             Lactuca sativa               Imagination
Rijk Zwaan    control             Lactuca sativa               Jazzie
Rijk Zwaan    control             Lactuca sativa               Madras
Rijk Zwaan    control             Lactuca sativa               Platinas
Tozer seeds   control             Lactuca sativa               Cobham Green
WHRI          LJ 03050 -control   Lactuca serriola             US96UC23 UCDavis mapping parent
Mean score          Mean score          Mean score all           %browning (day3)    %pinking (day3)
browning (day 3)    Pinking (day 3)     discoloration (day 3)

            25.35               47.23                    36.57               37.22              83.60
            28.27               25.71                    27.43               38.77              37.71
            30.46                                        38.95               41.95              75.86
             9.10               40.80                    28.83                6.47              31.01
            38.70                5.92                    27.06               58.91               8.53
            43.30               27.15                    34.97               70.10              40.52
            39.33               31.58                    35.54               48.55              44.36
            27.65               42.73                    34.98               39.55              73.09
            25.88               39.93                    33.25               35.68              67.51
            50.84               17.79                    35.55               63.44              26.00
            43.94               35.98                    38.97               70.88              59.53
            39.15                0.00                    25.41               30.61               0.70
            44.76               30.57                    36.96               76.04              47.68
            22.80               45.18                    34.67               31.40              75.07
            41.59               60.71                    49.85               56.01              85.81
            48.38               16.51                    33.95               85.82              23.89
            21.90               43.76                    33.85               30.87              77.50
            34.83               29.38                    33.93               53.94              48.47
            24.58               50.46                    37.84               32.32              85.20
            36.81               16.75                    29.45               48.94              26.44
            36.00               18.40                    30.36               63.19              28.93
            18.16               14.81                    18.90               26.43              22.36
            30.22               36.06                    33.23               41.09              58.60
            32.60               31.26                    32.13               45.50              48.12
             9.49               30.43                    22.92               13.55              47.25
            16.59               40.28                    30.05               22.68              70.48
            43.08               18.65                    32.32               71.34              27.11
            37.69                8.63                    27.31               59.03              12.61
%discoloration
(day3)

          88.60
          60.46
          83.19
          79.78
          90.00
          90.00
          81.15
          85.20
          78.68
          82.26
          88.47
          81.61
          90.00
          85.20
          90.00
          90.00
          85.65
          83.71
          90.00
          69.34
          77.34
          47.02
          77.43
          71.60
          67.94
          79.18
          90.00
          88.60

				
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posted:8/29/2012
language:English
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