PS 6545691
| Denomination: | 'PS 6545691' |
|---|---|
| Botanical Name: | Lactuca sativa |
| Applicant/Holder: |
Seminis Vegetable Seeds, Inc. 800 North Lindbergh Blvd. St. Louis, Missouri 63167 United States of America |
| Breeder: |
Bill Waycott, Seminis Vegetable Seeds, Inc., Oxnard, United States of America |
| Agent in Canada: |
Seminis Vegetable Seeds, Inc. 613 Tomahawk Cresent Ancaster, Ontario L9G 3T4 Canada Tel: 905-304-1795 |
| Application Date: | 2004-08-11 |
| Application Number: | 04-4315 |
| Grant of Rights Date: | 2009-02-27 |
| Certificate Number: | 3455 |
| Date rights revoked: | 2011-07-19 |
Variety Description
Variety used for comparison: 'Clemente'
Summary: 'PS 6545691' has a smaller, denser head than 'Clemente'. The leaves of 'PS 6545691' are slightly darker green, thicker and less erect than 'Clemente. 'PS 6545691' has an obovate shaped leaf while it is elliptic in 'Clemente'. The leaf margin of 'PS 6545691' has stronger undulation with deeper incisions than 'Clemente'.
Description:
SEEDLING: absent or very weak anthocyanin, small narrow elliptic cotyledon
LEAF: semi-erect attitude at maturity, thick, obovate, dark grey green, no anthocyanin, medium glossiness on upper side, flat surface profile of outer leaves, absent or very weak small blisters, entire margin, strong undulation of margin, medium depth incisions of apical part, medium density of incisions of apical part, not flabellate venation, absent or very weak axillary sprouting
HEAD: romaine type, open to closed (overlapping) formation, medium density, elliptical shape in longitudinal section
SEED: black
DISEASE RESISTANCE: resistant to lettuce mosaic virus (strain Ls1)
Origin & Breeding History: 'PS 6545691' originated from a cross made in 1993 of 'PI206964' by 'Salinas 88' at the Petoseed Company's Research Station in Arroyo Grande, California, USA. Pedigree selection using both single plant and mass selection practices were used with the selection criteria of plant form, leaf colour, leaf texture, taste, head density and disease resistance.
Tests & Trials: Tests and trials were conducted during the summer of 2007 in Lynden, Ontario. There were 10 replications with 15 plants per replicate. Plants were spaced 15 centimeters apart within the row, with a row spacing of 75 centimeters. Results were supported by the official Plant Breeders' Right technical examination report, 2003/2147, purchased from the Community Plant Variety Office.
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Lettuce: 'PS 6545691' (left) with reference variety 'Clemente' (right)
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