Clearwater
| Denomination: | 'Clearwater' |
|---|---|
| Botanical Name: | Lactuca sativa |
| Applicant/Holder: |
Enza Zaden Beheer B.V. Haling 1E 1602 DB Enkhuizen Enkhuizen Netherlands |
| Breeder: |
Magali Lemont, Enza Zaden Beheer B.V., Netherlands |
| Agent in Canada: |
Smart & Biggar LP P.O. Box 2999, Station D 55 Metcalfe Street, Suite 900 Ottawa, Ontario K1P5Y6 Canada Tel: 613-232-2486 ex. 1279 |
| Application Date: | 2018-02-28 |
| Provisional Protection:: | 2018-02-28 |
| Application Number: | 18-9385 |
| Grant of Rights Date: | 2019-07-19 |
| Certificate Number: | 5998 |
| Grant of Rights Termination Date: | 2039-07-19 |
Variety Description
Description:
SEED: white seed coat
SEEDLING: no anthocyanin colouration
PLANT: cutting or gathering oak leaf type used for open cultivation, small to medium diameter, no head formation, absent or very weak axillary sprouting, time of harvest maturity is mid-season, begins bolting under long day conditions early to mid-season, weak to medium intensity of fasciation at flowering stage
LEAF: medium to thick, erect attitude at harvest maturity, medium elliptic shape, acute tip, hue of green colour of outer leaves absent, dark to very dark intensity of colour of outer leaves, no anthocyanin colouration, weak degree of glossiness of upper side, medium to strong blistering, very small to small blisters
LEAF BLADE: very weak to weak undulation of margin, venation is not flabellate
LEAF BLADE (INCISIONS OF MARGIN ON APICAL PART): very shallow to shallow, sparse, dentate
LEAF BLADE (AT 10 TO 12 LEAF STAGE): erect attitude, lobed division
RESISTANCE: resistance to Downy mildew (Bremia lactucae) isolates Bl:16, Bl:17, Bl:18, Bl:20, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25, Bl:26, Bl:27, Bl:29, Bl:30, Bl:31, Bl:32, Bl:33, Bl:34 and Bl:35 and strain US Ca:I- IX present; resistance to Lettuce mosaic virus (LMV) strain Ls-1 present; resistance to Nasonovia ribisnigri biotype Nr:0 present and lettuce dieback (TBSV) resistant
Origin & Breeding History: 'Clearwater' (experimental designation 'E01K.30358') originated from a cross conducted in June of 2011 in the greenhouses of Enza Zaden Recherche France, in Allonnes, between the variety 'Bolsachica (EZ)', as the female parent, and Enza breeding line 'F56923', as the male parent. The resulting F1 seeds were planted in the greenhouses in July of 2011. The F2 seeds were collected and bulked in September of 2011. From 2011 to 2014, successive generations were grown, selections were conducted at the young plant stage and harvested at Enza Zaden Recherche in Allonnes. The criteria used for making selections at each generation were leaf colour, leaf thickness and leaf shape for baby leaf production, combined with resistance to Downy mildew (Bremia lactucae) and Lettuce mosaic virus (LMV) strain Ls-1. In 2014, the line of F5 seedlings that showed the best uniformity, colour and leaf type was evaluated in different direct sowing baby leaf trials. A decision was taken to advance this line for further trialing and the line that was the most uniform later became known as 'Clearwater'.
Tests & Trials: The detailed description of 'Clearwater' is based on the UPOV report of Technical Examination, application number SLA3714, purchased from Naktuinbouw in Roelofarendsveen, Netherlands. The trial was conducted by Naktuinbouw in Roelofarendsveen, Netherlands in 2017.
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Lettuce: 'Clearwater'
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Lettuce: 'Clearwater'
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